**Process Specification for the Installation of Key-retained Screw
Thread Inserts**

+-----------------------------------------------------------------------+
| **Engineering Directorate**                                           |
|                                                                       |
| **Structural Engineering Division**                                   |
|                                                                       |
| February 2007                                                         |
|                                                                       |
| ![](media/image1.png){width="1.3944444444444444in"                    |
| height="1.113888888888889in"}                                         |
|                                                                       |
| National Aeronautics and                                              |
|                                                                       |
| Space Administration                                                  |
|                                                                       |
| **Lyndon B. Johnson Space Center**                                    |
|                                                                       |
| Houston, Texas                                                        |
+-----------------------------------------------------------------------+

**Process Specification for the Installation of Key-retained Screw
Thread Inserts**

+--------------+------------------------------------+-----+------------+
| **Prepared   |                                    |     |            |
| by:**        |                                    |     |            |
+--------------+------------------------------------+-----+------------+
|              | Jay E. Bennett                     |     | Date       |
|              |                                    |     |            |
|              | Materials and Processes Branch     |     |            |
|              |                                    |     |            |
|              | ES4                                |     |            |
+--------------+------------------------------------+-----+------------+
|              |                                    |     |            |
+--------------+------------------------------------+-----+------------+
| **Approved   | Bradley S. Files, Chief            |     | Date       |
| by:**        |                                    |     |            |
|              | Materials and Processes Branch     |     |            |
|              |                                    |     |            |
|              | ES4                                |     |            |
+--------------+------------------------------------+-----+------------+
|              |                                    |     |            |
+--------------+------------------------------------+-----+------------+

  ----------- --------------------------------------------- ---------------
  REVISIONS                                                 

  VERSION     CHANGES                                       DATE

  \--         Original version                              5/31/96

  A           Included reference to sealing specification,  7/29/99
              improved the verification section, and        
              reordered the sections.                       

  B           Added three new paragraphs to section 3. In   10/18/99
              the tables in appendix A, created a separate  
              column for NAS part numbers, corrected two    
              typos in part number designations, and        
              rounded off tap drill depths to nearest       
              .005".                                        

  C           Changed Division name. Revised Section 6.1    10/2004
              (Work Instructions), and revised Section 9.0  
              (Training).                                   

  D           Updated document numbers and names in Section 2/2007
              4.0 (References)                              
  ----------- --------------------------------------------- ---------------

**1.0 [SCOPE]{.underline}**

This process specification establishes requirements for the installation
of key-retained inserts and studs.

**2.0 [APPLICABILITY]{.underline}**

This specification shall be applicable whenever the installation of
key-retained inserts and studs is invoked per section 3.0, "Usage".

**3.0 [USAGE]{.underline}**

This process specification shall be called out on the engineering
drawing by using a drawing note. For example:

**INSTALL KEY-RETAINED INSERTS PER NASA/JSC PRC-9006.**

Most hole preparation details do not need to be specified on the
engineering drawing because the requirements are covered in this PRC.
Through-holes are preferred, but must be specified on the engineering
drawing. Use of a plug tap is standard for blind holes. When use of a
bottom tap is necessary, it shall be specified on the engineering
drawing as follows:

**USE BOTTOM TAP.**

The depth of the drill hole for plug taps is the sum of the maximum
insert length, the maximum insert depth below the surface, and the
length of five incomplete threads. The depth of the drill hole for
bottom taps is the sum of the maximum insert length, the maximum insert
depth below the surface, and the length of three incomplete threads.
Standard drill hole depths are found in Tables 1, 2, 3, and 4 (see
Appendix A). Alternate drill hole depths may be used, as long as minimum
full thread depth is maintained, but the alternate drill hole depth must
be specified on the engineering drawing.

The depth of the drilled hole does not include the material removed by
point of the drill. The standard drill point has an included angle of
60°. A 135° or flat bottom drill bit can be utilized if necessary, but
must be called out on the engineering drawing.

The hole preparation for self-locking and non-self-locking inserts is
identical except for the larger sizes. Separate hole preparation
dimensions are given for these sizes.

This specification may be used to install non-standard key-retained
screw thread inserts. The hole preparation dimensions for these inserts
shall be called out on the engineering drawing.

Wet installation of inserts with corrosion preventative primer is
standard for aluminum and for dissimilar metal joints. Use the following
callout:

**SEAL INSERT PER NASA/JSC PRC-4004.**

In some design cases, sealant may not be necessary, but the decision not
to use sealant should be reviewed in advance with Materials and
Processes Branch (ES4) personnel.

**4.0 [REFERENCES]{.underline}**

The following references were used to develop this process
specification:

SOP-007.1 *Preparation and Revision of Process Specifications*

JPR 8500.4 *Engineering Drawing System Manual*

The following documents are called out as an extension of the
requirements given in this specification:

FED-STD-H28/2B *Screw-Thread Standards for Federal Services, Section 2,
Unified Inch Threads \-- UN And UNR Thread Forms*

MSFC-SPEC-250 *Protective Finishes for Space Vehicle Structures and
Associated Flight Equipment, General Specification for*

MS51830 *Insert, Screw-Thread, Locked In, Key-Locked, Miniature and
Lightweight*

MS51831 *Insert, Screw-Thread, Locked In, Key-Locked, Heavy Duty*

MS51832 *Insert, Screw-Thread, Locked In, Key-Locked, Extra Heavy Duty*

MS51833 *Stud, Locked In, Key-Locked, Regular Duty*

MS51834 *Stud, Locked In, Key-Locked, Heavy Duty*

MS51835 *Inserts and Studs, Locked in, Key Locked, Hole Dimensions for
and Assembly of*

NAS1394 *Insert-Threaded Metal, Lightweight, Self-Locking, and Non
Self-Locking*

NAS1395 *Insert-Threaded Metal, Heavy Duty, Self-Locking, and Non
Self-Locking*

**5.0 [MATERIAL REQUIREMENTS]{.underline}**

None identified.

**6.0 [PROCESS REQUIREMENTS]{.underline}**

**6.1 WORK INSTRUCTIONS**

All work shall be performed to written procedures. The work instructions
shall contain sufficient detail to ensure that the manufacturing process
produces consistent, repeatable products that comply with this
specification.

For work performed at JSC facilities, these work procedures consist of
Detailed Process Instructions (DPI's).

For contracted work, the contractor shall be responsible for preparing
and maintaining, and certifying written work procedures that meet the
requirements of this specification.

**6.2 HOLE PREPARATION AND DRILLING**

Hole preparation shall be in accordance with Tables 1,2, 3, and 4 in
Appendix A. In addition, tapped holes shall be drilled to the diameter
and depth specified in the Appendix A tables.

**6.3 COUNTERSINK**

The edge of the recess shall be countersunk. The angle of countersink
shall be 100 degrees inclusive.

**6.4 TAPPING**

Threads in the parent material shall meet FED-STD-H28/2B, UN thread
form, with a modified minor diameter, tolerance class 2B, except when
noted as NS. Minimum full thread depth requirements shall be as noted in
the Appendix A tables.

**6.5 HOLE FINISH**

The hole protective finish shall be completed as-specified on the
engineering drawing.

**6.6 FLUSHNESS**

Miniature inserts shall be 0.005 to 0.015 in. below the surface of the
parent material after installation. Lightweight, heavy-duty, and extra
heavy-duty inserts shall be 0.010 to 0.030 inch below the surface of the
parent material after installation. The driven keys shall be flush or
below the surface of the parent material.

**6.7 BROACHING**

When key inserts are installed into materials where the minimum ultimate
tensile strength is greater than 80,000 pounds per square inch, the
slots for the locking keys shall be broached. The slots shall also be
broached for aluminum alloys that are defined as non-corrosion resistant
by MSFC-SPEC-250.

**7.0 [PROCESS QUALIFICATION]{.underline}**

The key insert installation process shall be qualified and accepted
prior to assembly of production parts. This qualification shall provide
documented evidence that the installation procedures are capable of
meeting the requirements of this process specification and the
engineering drawing. Any change to the procedure or insert type shall
require re-qualification.

**8.0 [PROCESS VERIFICATION]{.underline}**

The requirements in sections 6.2 (Hole Preparation and Drilling), 6.3
(Counter-sink), 6.4 (Tapping), and 6.6 (Flushness) shall be verified by
inspection.

**9.0 [TRAINING AND CERTIFICATION OF PERSONNEL]{.underline}**

This process shall be performed by personnel qualified through training
or experience and certified by their supervision to conduct the process.

**10.0 [DEFINITIONS]{.underline}**

None.

**APPENDIX A -- INSERT INSTALLATION DATA**

Table 1\-- Miniature Insert Installation Data

+-----------+----------+------+-------+--------+----------+----------+
| Insert    | Hole     |      |       |        |          |          |
|           | Pre      |      |       |        |          |          |
|           | paration |      |       |        |          |          |
+-----------+----------+------+-------+--------+----------+----------+
| Part      | Internal | Tap  | Plug  | Bottom | CSK Dia  | Minimum  |
| Number    | Thread   | D    | Tap   | Tap    |          |          |
|           | (        | rill |       |        | +0.010   | Full     |
|           | Modified | Diam | Drill | Drill  |          | Thread   |
|           | Minor    | eter | Depth | Depth  | -0.000   | Depth    |
|           | D        |      |       |        |          |          |
|           | iameter) |      | ±     | ±      |          |          |
|           |          |      | 0.010 | 0.010  |          |          |
+-----------+----------+------+-------+--------+----------+----------+
| MS5       | 0.164-32 | .137 | .305  | .245   | .166     | .140     |
| 1830XX101 |          |      |       |        |          |          |
|           |          | .133 |       |        |          |          |
+-----------+----------+------+-------+--------+----------+----------+
| MS5       | 0.190-32 | .164 | .355  | .295   | .194     | .160     |
| 1830XX102 |          |      |       |        |          |          |
|           |          | .160 |       |        |          |          |
+-----------+----------+------+-------+--------+----------+----------+
| MS5       | 0.216-28 | .191 | .380  | .305   | .220     | .160     |
| 1830XX103 |          |      |       |        |          |          |
|           |          | .186 |       |        |          |          |
+-----------+----------+------+-------+--------+----------+----------+
| MS5       | 0.250-28 | .231 | .430  | .355   | .255     | .210     |
| 1830XX104 |          |      |       |        |          |          |
|           |          | .227 |       |        |          |          |
+-----------+----------+------+-------+--------+----------+----------+

Table 2\-- Lightweight Insert Installation Data

+---------+---------+--------+-----+------+-------+--------+--------+
| Insert  |         | Hole   |     |      |       |        |        |
| Part    |         | Prepa  |     |      |       |        |        |
| Number  |         | ration |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS      | In     | Tap | Plug | B     | CSK    | M      |
| Series  | Series  | ternal | Dr  | Tap  | ottom | Dia    | inimum |
|         |         | Thread | ill |      | Tap   |        |        |
|         |         | (Mo    | Di  | D    |       | +0.010 | Full   |
|         |         | dified | ame | rill | Drill |        | Thread |
|         |         | Minor  | ter | D    | Depth | -0.000 | Depth  |
|         |         | Dia    |     | epth |       |        |        |
|         |         | meter) |     |      | ±     |        |        |
|         |         |        |     | ±0   | 0.010 |        |        |
|         |         |        |     | .010 |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.3    | .   | .635 | .525  | .323   | .370   |
| 1394XX3 | 30XX105 | 125-18 | 276 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX201 |        | 271 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX101 |        |     |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX201 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.3    | .   | .735 | .610  | .385   | .430   |
| 1394XX4 | 30XX106 | 750-16 | 336 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX202 |        | 331 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX102 |        |     |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX202 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.4    | .   | .840 | .695  | .447   | .500   |
| 1394XX5 | 30XX107 | 375-14 | 401 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX203 |        | 396 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX103 |        |     |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX203 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.5    | .   | .930 | .775  | .510   | .560   |
| 1394XX6 | 30XX108 | 000-13 | 457 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX204 |        | 452 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX104 |        |     |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX204 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.5    | .   | 1    | .855  | .572   | .620   |
| 1394XX7 | 30XX109 | 625-12 | 521 | .025 |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX205 |        | 515 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX105 |        |     |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX205 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+
| NAS     | MS518   | 0.6    | .   | 1    | .945  | .635   | .680   |
| 1394XX8 | 30XX110 | 250-11 | 583 | .125 |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        | .   |      |       |        |        |
|         | 30XX206 |        | 577 |      |       |        |        |
|         |         |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX106 |        |     |      |       |        |        |
|         | MS518   |        |     |      |       |        |        |
|         | 33XX206 |        |     |      |       |        |        |
+---------+---------+--------+-----+------+-------+--------+--------+

Table 3 \-- Heavy Duty Insert Installation Data

+---------+----------+---------+------+------+-------+-------+-------+
| Insert  |          | Hole    |      |      |       |       |       |
| Part    |          | Prep    |      |      |       |       |       |
| Number  |          | aration |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS       | I       | Tap  | Plug | B     | CSK   | Mi    |
| Series  | Series   | nternal | D    | Tap  | ottom | Dia.  | nimum |
|         |          | Thread  | rill |      | Tap   |       |       |
|         |          | (M      | Diam | D    |       | +     | Full  |
|         |          | odified | eter | rill | Drill | 0.010 | T     |
|         |          | Minor   |      | D    | Depth |       | hread |
|         |          | Di      |      | epth |       | -     |       |
|         |          | ameter) |      |      | ±     | 0.000 | Depth |
|         |          |         |      | ±0   | 0.010 |       |       |
|         |          |         |      | .010 |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS1    | MS51     | 0.      | .276 | .635 | .525  | .323  | .370  |
| 395XX08 | 834XX101 | 3125-18 |      |      |       |       |       |
|         |          |         | .271 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX201 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .336 | .670 | .545  | .385  | .370  |
| 1395XX3 | 831XX101 | 3750-16 |      |      |       |       |       |
|         |          |         | .331 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX201 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX102 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX202 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .401 | .775 | .635  | .447  | .430  |
| 1395XX4 | 831XX102 | 4375-14 |      |      |       |       |       |
|         |          |         | .396 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX202 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX103 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX203 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .457 | .865 | .715  | .510  | .500  |
| 1395XX5 | 831XX103 | 5000-13 |      |      |       |       |       |
|         |          |         | .452 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX203 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX104 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX204 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .521 | .960 | .795  | .572  | .560  |
| 1395XX6 | 831XX104 | 5625-12 |      |      |       |       |       |
|         |          |         | .515 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX204 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX105 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX205 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .583 | 1    | .945  | .635  | .680  |
| 1395XX7 | 831XX105 | 6250-11 |      | .125 |       |       |       |
|         |          |         | .577 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX205 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX106 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX206 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.68    | .646 | 1    | 1.005 | .700  | .750  |
| 1395XX8 | 831XX106 | 75-11NS |      | .185 |       |       |       |
|         |          |         | .640 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX206 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX107 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX207 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS     | MS51     | 0.      | .771 | 1    | 1.045 | .822  | .940  |
| 1395XX9 | 831XX107 | 8125-16 |      | .170 |       |       |       |
|         |          |         | .765 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX207 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX108 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX208 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
| NAS1    | MS51     | 0       | .833 | 1    | 1.135 | .885  | 1.000 |
| 395XX10 | 831XX108 | .875-14 |      | .275 |       |       |       |
|         |          |         | .827 |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 831XX208 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX109 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX209 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS51     | 1       | 1    | 1    | 1.420 | 1.145 | 1.310 |
|         | 831XX109 | .125-12 | .067 | .585 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         | 1    |      |       |       |       |
|         | 831XX209 |         | .061 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX110 |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX201 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS518    | 1       | 1    | 1    | 1.545 | 1.145 | 1.440 |
|         | 31XX109L | .125-12 | .067 | .710 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         | 1    |      |       |       |       |
|         | 31XX209L |         | .061 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX110L |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX201L |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS51     | 1.25-12 | 1    | 1    | 1.545 | 1.270 | 1.440 |
|         | 831XX110 |         | .192 | .710 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         | 1    |      |       |       |       |
|         | 831XX210 |         | .186 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX111 |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX211 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS518    | 1.25-12 | 1    | 1    | 1.670 | 1.270 | 1.560 |
|         | 31XX110L |         | .192 | .835 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         | 1    |      |       |       |       |
|         | 31XX210L |         | .186 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX111L |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX211L |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS51     | 1       | 1    | 1    | 1.670 | 1.395 | 1.560 |
|         | 831XX111 | .375-12 | .317 | .835 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         | 1    |      |       |       |       |
|         | 831XX211 |         | .311 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX112 |         |      |      |       |       |       |
|         | MS51     |         |      |      |       |       |       |
|         | 834XX212 |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+
|         | MS518    | 1       | 1    | 1    | 1.795 | 1.395 | 1.680 |
|         | 31XX111L | .375-12 | .317 | .960 |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         | 1    |      |       |       |       |
|         | 31XX211L |         | .311 |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX112L |         |      |      |       |       |       |
|         |          |         |      |      |       |       |       |
|         | MS518    |         |      |      |       |       |       |
|         | 34XX212L |         |      |      |       |       |       |
+---------+----------+---------+------+------+-------+-------+-------+

Table 4 \-- Extra Heavy Duty Insert Installation Data

+------------+----------+------+--------+-------+---------+----------+
| Insert     | Hole     |      |        |       |         |          |
|            | pre      |      |        |       |         |          |
|            | paration |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| Part       | Internal | Tap  | Plug   | B     | CSK     | Minimum  |
| Number     | Thread   | D    | Tap    | ottom | Dia.    |          |
|            | (        | rill |        | Tap   |         | Full     |
|            | Modified | Diam | Drill  |       | +0.010  | Thread   |
|            | Minor    | eter | Depth  | Drill |         |          |
|            | D        |      |        | Depth | -0.000  | Depth    |
|            | iameter) |      | ±0.010 |       |         |          |
|            |          |      |        | ±     |         |          |
|            |          |      |        | 0.010 |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .4375-14 | .401 | .715   | .570  | .447    | .370     |
| 51832XX101 |          |      |        |       |         |          |
|            |          | .396 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX201 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .500-13  | .457 | .805   | .650  | .510    | .440     |
| 51832XX102 |          |      |        |       |         |          |
|            |          | .452 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX202 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .5625-12 | .521 | .900   | .730  | .572    | .500     |
| 51832XX103 |          |      |        |       |         |          |
|            |          | .515 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX203 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .625-11  | .583 | 1.000  | .820  | .635    | .560     |
| 51832XX104 |          |      |        |       |         |          |
|            |          | .577 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX204 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .6       | .646 | 1.125  | .945  | .700    | .680     |
| 51832XX105 | 875-11NS |      |        |       |         |          |
|            |          | .640 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX205 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .8125-16 | .771 | 1.045  | .920  | .822    | .750     |
| 51832XX106 |          |      |        |       |         |          |
|            |          | .765 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX206 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | .875-14  | .833 | 1.215  | 1.070 | .885    | .940     |
| 51832XX107 |          |      |        |       |         |          |
|            |          | .827 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX207 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | 1.000-12 | .942 | 1.335  | 1.170 | 1.020   | 1.000    |
| 51832XX108 |          |      |        |       |         |          |
|            |          | .936 |        |       |         |          |
| MS         |          |      |        |       |         |          |
| 51832XX208 |          |      |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | 1.250-12 | 1    | 1.587  | 1.420 | 1.270   | 1.310    |
| 51832XX109 |          | .192 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS         |          | 1    |        |       |         |          |
| 51832XX209 |          | .186 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS5        | 1.250-12 | 1    | 1.712  | 1.545 | 1.270   | 1.440    |
| 1832XX109L |          | .192 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS5        |          | 1    |        |       |         |          |
| 1832XX209L |          | .186 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | 1.375-12 | 1    | 1.712  | 1.545 | 1.395   | 1.440    |
| 51832XX110 |          | .317 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS         |          | 1    |        |       |         |          |
| 51832XX210 |          | .311 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS5        | 1.375-12 | 1    | 1.837  | 1.670 | 1.395   | 1.560    |
| 1832XX110L |          | .317 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS5        |          | 1    |        |       |         |          |
| 1832XX210L |          | .311 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS         | 1.500-12 | 1    | 1.837  | 1.670 | 1.520   | 1.560    |
| 51832XX111 |          | .442 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS         |          | 1    |        |       |         |          |
| 51832XX211 |          | .437 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+
| MS5        | 1.500-12 | 1    | 1.962  | 1.795 | 1.520   | 1.680    |
| 1832XX111L |          | .442 |        |       |         |          |
|            |          |      |        |       |         |          |
| MS5        |          | 1    |        |       |         |          |
| 1832XX211L |          | .437 |        |       |         |          |
+------------+----------+------+--------+-------+---------+----------+