U. S. DEPARTMENT OF COMMERCE

BUREAU OF STANDARDS

PLAIN AND THREAD

PLUG AND RING GAGE BLANKS

RECOMMENDED COMMERCIAL STANDARD

as adopted by

THE AMERICAN GAGE DESIGN COMMITTEE

MISCELLANEOUS PUBLICATION, BUREAU OF STANDARDS, No. 100

U. S. DEPARTMENT OF COMMERCE

R. P. LAMONT, Secretary BUREAU OF STANDARDS

GEORGE K. BURGESS, Director

MISCELLANEOUS PUBLICATION No. 100 PLAIN AND THREAD

PLUG AND RING GAGE BLANKS

RECOMMENDED COMMERCIAL STANDARD

as adopted by

THE AMERICAN GAGE DESIGN COMMITTEE

UNITED STATES

GOVERNMENT PRINTING OFFICE

WASHINGTON : 1930

For sale by the Superintendent of Documents, Washington, D. C, Price 15 cents
CONTENTS

Page

I. Development of the American Gage Design Standards 1 II. General conference 2

III. Standing committee 3

IV. Promotion of export trade 5

V. Terminology 5

VI. Details of construction, American gage design standards 6

1. Plain cylindrical plug gage blanks and handles; (details of construction (fig. 1) ; data sheets (Tables 1-6; fig. 2)) 6

(a) Taper lock design, above 0.059 to and including

1.510 inches 7

(6) Reversible design, above 1.510 to and including 4.510 inches 7

(c) Handles 9

2. Thread plug gage blanks and handles; (details of construction (fig. 3); data sheets, thread plug gages (Tables

7-10 and 12 and 13 (fig. 4); data sheets, pipe thread plug

gages (Table 11) ) 18

3. Plain ring gage blanks; (details of construction (fig. 5); data sheets (Tables 14 and 15)) 29

4. Thread ring gage blanks (details of construction (figs. 6 and

7); data sheets (Tables 16-19) ) 33

VII. Appendix 39

1. Taper plug and ring gages for checking taper lock handles and gaging members 39

2. Official monogram for designating products made to American gage design standards 43

3. Application of American gage design standards to special

types of gages, recommended practice 43

VIII. Index 45

ii
PLAIN AND THREAD PLUG AND RING GAGE BLANKS

RECOMMENDED COMMERCIAL STANDARD AS ADOPTED BY THE

AMERICAN GAGE DESIGN COMMITTEE

[REPORT OF THE AMERICAN GAGE DESIGN COMMITTEE]

I. DEVELOPMENT OF THE AMERICAN GAGE DESIGN

STANDARDS

The American Gage Design Committee was formed in December,

1926, to consolidate for the benefit of industry at large the independent

efforts which were already in progress on the part of a number of large

industrial concerns, representatives of United States Government

departments, and several of the leading gage manufacturers to simplify

gaging practice through the adoption of standard designs for gage

blanks and component parts. The designs developed by the American Gage Design Committee are now available to everyone and will minimize the necessity for the manufacture of special gages of the

simpler types. The committee was given full support and recognition

by engineering societies, the American Standards Association, the

Bureau of Standards, the War and Navy Departments, and the

National Screw Thread Commission. It should be pointed out,

however, that the major work of the committee was contributed by

industry itself, many of the country's largest industrial units in

widely diversified fields being represented by active membership on

the committee. Joint meetings were held with the National Screw

Thread Commission throughout 1927 and 1928. Rapid progress was made in these meetings, and formal design standards were completed

and adopted for plain plug and ring, and thread plug and ring gages

of all sizes above 0.059 to and including 4% inches diameter.

The meetings of the committee were open, and ideas and suggestions

from all branches of industry were welcomed and given careful consideration, it being the earnest endeavor of the committee to crystallize the best design and construction of gage blanks, handles, and

component parts for plain and thread gages. No attempt has been

made to set gage tolerances or fits, the work being confined solely to

selection of the best possible designs for gage blanks ; but the work on

fits and tolerances of the National Screw Thread Commission and of

the Sectional Committee on the Standardization of Plain Limit

Gages for General Engineering Work is available for use in connection

with gages made to American Gage Design Standards.

1
2 AMERICAN GAGE DESIGN COMMITTEE

The fullest cooperation was extended by all, proprietary patent

rights being waived by individual gage manufacturers for the general

benefit of industry.

In promulgating the new standards, the committee has not intended

to obsolete existing stocks of gages in the hands of manufacturers or

users; rather, it has been its intention to provide a standard which

could be gradually adopted through replacement of existing stocks.

Representing the best ideas of industry at large, including gage makers

and gage users, the American Gage Design Standards should have

whole-hearted support and be accepted and used by gage purchasers,

and should render obsolete the wasteful and costly practice of requisitioning gages to individual design standards, which has existed in

many cases heretofore. Tool supervisors and standards departments

of large industrial concerns are particularly urged to adopt, as soon as

practicable, the American Gage Design Standards as a substitute for any individual standards which may now be employed. The result

will inevitably be the elimination of confusion in gage departments,

and advancement in the direction of economy and quality of product.

The committee's efforts to make available in every instance the best

possible design of gage blank was materially furthered by the generous

action of the gage manufacturers represented on the committee, all of whom offered without reservation to dedicate to public use their

proprietary patent rights on any gage construction, the utilization of which might be desired by the committee. The committee desires to make formal recognition in this report of the specific action of the Pratt & Whitney Co., of Hartford, Conn., and the Taft-Peirce Manufacturing Co., of Woonsocket, R. I., in contributing, respectively,

their patented trilock plug gage design and patented single-unit

thread-ring gage locking device to public use, as a part of this standardization program.

The American Gage Design Standards are detailed by description,

line drawings, and dimensional tables in the pages that follow.

II. GENERAL CONFERENCE

The sessions of the American Gage Design Committee held October 12 and 13, 1928, in New Haven, Conn., assumed the functions

of the general conference. Practically all of the leading producers

and users had been invited, and the work of the committee was es- sentially complete.

The general conference formally adopted the report of the American

Gage Design Committee as a commercial standard and voted to request the application of the certification plan by the Bureau of

Standards.

The conference set the effective date for new production as July 1, 1929, and for clearance of existing stocks as not later than January 1, 1931.
PLUG AND RING GAGE BLANKS 3

It was the consensus of opinion that the standard should be regularly considered for revision every six months in order that it might

be kept abreast with current practices and progress in the art.

III. STANDING COMMITTEE

The following standing committee was appointed by the chairman and approved by unanimous consent:

Col. J. O. Johnson, chairman, Ordnance Department, United States Army.

F. S. Blackall, jr., Taft-Peirce Manufacturing Co.

E. J. Bryant, Greenfield Tap & Die Corporation.

C. R. Burt, Pratt & Whitney Co.

A. C. Danekind, General Electric Co.

C. B. LePage, The American Society of Mechanical Engineers. D. W. Ovaitt, General Motors Corporation.

The following, among others, have participated in the work of the

American Gage Design Committee:

Erik Aldeborgh, the Standard Gage

Co., Poughkeepsie, N. Y.

J. Chester Bath, John Bath & Co., Worcester, Mass. H. W. Bearce, secretary, Bureau of Standards, Washington, D. C.

F. J. Benesch, machine manufacturing

planning division, Western Electric

Co., Hawthorne Station, Chicago,

IU. *fF. S. Blackall, jr., chairman of editorial subcommittee, vice president

and general manager, The TaftPeirce Manufacturing Co., Woonsocket, R. I. *JE. J. Bryant, Greenfield Tap & Die

Corporation, Greenfield, Mass.

*C. R. Burt, vice president and general manager, Pratt & Whitney Co., Hartford, Conn.

Fred Colvin, editor American Machinist, Tenth Avenue and Thirty-sixth

Street, New York, N. Y.

*JA. C. Danekind, manager's office, Building 44, General Electric Co., Schenectady, N. Y.

A. H. d'Arcambal, Pratt & Whitney

Co., Hartford, Conn.

C. F. Dreyer, development engineer,

mechanical inspection development, Western Electric Co., Hawthorne

Station, Chicago, 111.

George M. Foster, Northern Electric

Co., Montreal, Canada.

John Gaillard, mechanical engineer, A. S. A., 29 West Thirty-ninth

Street, New York, N. Y. tfW. H. Gourlie, gage division, Pratt &

Whitney Co., Hartford, Conn.

A. Grieve, Chevrolet Motor Co., Detroit, Mich.

E. D. Hall, Western Electric Co., Hawthorne Station, Chicago, 111. E. A. Hanson, president, The Hanson- Whitney Machine Co., Hartford, Conn.

P. M. Herrick, Cadillac division, General Motors Corporation, Detroit,

Mich. H. D. Hiatt, Nash Motors Co., Racine,

Wis.

W. L. Hindman, Dodge Bros., (Inc.), Detroit, Mich.

Commander H. B. Hird, Bureau of Engineering, Navy Department,

Washington, D. C.

*Col. J. O. Johnson, chairman, chief, gage section, Ordnance Department,

3737 Munitions Building, Washington, D. C.

C. V. Johnson, sales engineer, The

John-Sons Gage Works, Hartford, Conn.

* Member of standing committee,

t Member of editorial committee.

X Member of technical subcommittee.
4 AMERICAN GAGE DESIGN COMMITTEE

JH. S. Kartsher, 3211 Sycamore Road,

Cleveland Heights, Ohio. *C. B. LePage, assistant secretary, A. S. M. E., 29 West Thirty-ninth

Street, New York, N. Y.

JH. B. Lewis, Brown & Sharpe Manufacturing Co., Providence, R. I. A. M. Lord, Taylor Instrument Cos., Rochester, N. Y.

JL. M. McPharlin, Pierce-Arrow Motor

Car Co., Buffalo, N. Y.

J P. V. Miller, manager, small tool department, The Taft-Peirce Manufacturing Co., Woonsocket, R. I. C. H. Moen, Muncie Products Co., Muncie, Ind. W. C. Mueller, assistant superintendent

of manufacturing planning, Western

Electric Co., Hawthorne Station,

Chicago, 111. R. S. Newton, the New York Air Brake Co., Watertown, N. Y. W. J. Outcalt, standards section, General Motors Corporation, Detroit,

Mich.

*JD. W. Ovaitt, chairman of technical subcommittee, General Motors Corporation, c/o Buick Motor Co., Flint, Mich.

C. J. Oxford, chief engineer, National

Twist DriU & Tool Co., Detroit,

Mich.

Lieut. Col. E. C. Peck, Room 305, Lake Erie Bank Building, 1612 Euclid Avenue, Cleveland, Ohio. Louis E. Peck, general manager, the Threadwell Tool Co., Greenfield, Mass.

Charles M. Pond, manager, small tool and gage division, Pratt & Whitney

Co., Hartford, Conn.

C. H. Reynolds, The Sheffield Machine

& Tool Co., Dayton, Ohio.

P. D. Ritchey, the Standard Gage Co., Poughkeepsie, N. Y.

C. E. Rundorff, research department,

Buick Motor Co., Flint, Mich.

JA. W. Schoof, gage development and

standards department, Western Electric Co., Hawthorne Station, Chicago, 111. A. J. Schwartz, United States Naval

Gun Factory, Navy Yard, Washington, D. C.

J. A. Siegel, Packard Motor Car Co., Detroit, Mich.

O. J. Snider, Cadillac Motor Car Co., Detroit, Mich. H. B. Stringer, Winter Bros. Co., Wrentham, Mass. H. L. Van Keuren, The Van Keuren

Co., 12 Copeland Street, Watertown, Boston, Mass.

$C. E. Watterson, president, The Sheffield Machine & Tool Co., Dayton,

Ohio. JW. H. Weingar, 88 Maplewood Avenue, West Hartford, Conn.

K. D. Williams, Bureau of Engineering, Room 2326, Navy Department,

Washington, D. C. Charles E. Winter, Winter Bros. Co., Wrentham, Mass. George R. Worner, Taylor Instrument

Cos., Rochester, N. Y.

* Member of standing committee,

t Member of editorial committee.

t Member of technical subcommittee.
PLUG AND RING GAGE BLANKS 5

IV. PROMOTION OF EXPORT TRADE

The question of promoting export trade on the basis of these

standards was left to the discretion of the standing committee.

V. TERMINOLOGY

The following glossary is intended to clarify the meaning of certain

technical terms employed in this report. The definitions are not

intended to be general; rather they are specific as to their application to the American Gage Design Standards.

1. American Gage Design Standard.—The caption "American Gage

Design Standard " has been adopted to designate gages made to the

design specifications promulgated by the American Gage Design

Committee.

2. A plain cylindrical plug gage is a complete unthreaded internal

gage of single or double ended type for the size control of holes. It consists of handle and gaging member or members, with suitable

locking means.

3. A progressive cylindrical plug gage is a complete unthreaded in- ternal gage consisting of handle and gaging member in which the "go " and "not go" gaging sections are combined in a single unit secured

to one end of the handle.

4. A thread plug gage is a complete internal thread gage of either

single or double ended type, comprising handle and threaded gaging

member or members, with suitable locking means.

5. The gaging member is that integral unit of a plug gage which is accurately finished to size and is employed for size control of the work.

In taper lock gages, the gaging member consists of a shank and a gaging section.

6. The gaging section is that portion of the gage which comes into

physical contact with the work. In the plug range above 1.510 to and including 4.510 inches, the gaging section is identical with the

gaging member.

7. The shank (applied to taper lock gages only) is that portion of

the gaging member which is employed for fixing the gaging member

to the handle.

8. The term utaper lock" designates that construction in which the

gaging member has a taper shank, which is forced into a taper hole

in the handle. This design is standard for plug gages in the range

above 0.059 inch to and including 1.510 inches, is optional for plain

cylindrical and thread plug gages in the range above 1.510 inches to and including 2.510 inches, and is standard for pipe-thread plug gages

up to and including 2-inch nominal pipe size.

9. A reversible plug gage is a plain cylindrical or thread plug gage,

in which three wedge-shaped locking prongs on the handle are forced

into corresponding locking grooves in the gaging member by means of
6 AMERICAN GAGE DESIGN COMMITTEE

a single through screw thus providing a self-centering support with a

positive lock. This design is standard for all plug gages in the ranges

above 1.510 to and including 4.510 inches, with the exception of pipe

thread plug gages, for which it is standard in the ranges above 2.510

to and including 4.510 inches.

10. Lightening holes are unfinished drilled holes provided in the

heavier sizes of gaging members for the sole purpose of reducing the

weight of the gage.

11. The handle is that portion of a plug gage which is employed as supporting means for the gaging member or members.

12. The drift hole or drift slot is a small hole or slot provided in the

side of a taper lock gage handle near the "go" end through which a pin or drift may be inserted for the purpose of ejecting the gaging

member from the handle.

13. A plain ring gage is an unthreaded external gage employed for the size control of external diameters. In the smaller sizes it consists

of a gage body into which is pressed a bushing, the latter being ac- curately finished to size for gaging purposes.

14. A thread ring gage is an external thread gage employed for the

size control of threaded work, means of adjustment being provided

integral with the gage body.

15. The flange is that external portion of a large ring gage which is reduced in section for the purpose of lightening the gage.

16. The hub is the mid-section of a flanged ring gage. It determines

the length of the gaging section.

17. The thread ring gage locking device is a means of expanding and

contracting the thread ring gage during the manufacturing or resizing processes. It also provides an effectual lock. It comprises an adjusting screw, a locking screw, and a sleeve. For detailed description and

illustration see page 33.

18. Adjusting slots are radial slots provided in thread ring gages in

order to facilitate expansion and contraction of gage size by means of the adjusting device. An adjusting slot always terminates in an

adjusting slot terminal hole. 19. The locking slot is that slot which passes entirely through the

wall of a thread ring gage. In conjunction with the thread ring gage

locking device, it permits expansion and contraction of gage size. VI. DETAILS OF CONSTRUCTION, AMERICAN GAGE DESIGN

STANDARDS

1. PLAIN CYLINDRICAL PLUG GAGE BLANKS AND HANDLES

Two separate designs have been adopted for plain cylindrical

plug gages—the taper lock design for the range from 0.059 to and

including 1.510 inches, and the reversible design with reversible
PLUG AND KING GAGE BLANKS 7

gaging members for the range from above 1.510 to and including

4.510 inches. For sizes above 0.240 inch to and including 2.510

inches, both straight and progressive gaging members are provided.

Use of the taper lock design is optional for the size range from above

1.510 to and including 2.510 inches.

(a) TAPER LOCK DESIGN ABOVE 0.059 TO AND INCLUDING 1.510 INCHES

It was felt that the taper lock design was particularly well suited

for the smaller sizes of plain plug gages. This type of gage is simple

and is economical of production and maintenance. The gaging

member has a taper shank which is forced into a taper hole in the

handle. When properly assembled, the taper lock gage possesses the

rigidity of a solid gage and is entirely free of shake or "wink." Drift

slots or drift holes are provided near one end of the handle, permitting

gaging members to be removed when replacement is necessary. In

the case of double-end gages, one end is removed by running a rod

through the hollow handle. In the smaller size ranges above 0.059

inch to and including 0.240 inch, a groove is provided near one end of

the handle to designate the "not go" end, as the length of the "go"

member in this range is often insufficient clearly to distinguish it from the "not go" member. The groove is omitted as unnecessary

above 0.240 inch.

Complete dimensional tolerances have been established for the mating parts of gaging members and handles, insuring absolute interchangeability of gaging members and handles wherever manufactured.

General details of construction will be apparent from Figure 1, page 8.

(b) REVERSIBLE DESIGN, ABOVE 1.510 TO AND INCLUDING 4.510 INCHES

Considerations of rigidity of construction and long life have dictated

the choice of the reversible design with reversible gaging members for

the size range above 1.510 inches. With this construction there is no chance for shake or "wink" to interfere with the sensitive feel so necessary in gages of this type. Three wedge-shaped locking prongs on the handle are forced into corresponding grooves in the gaging member by a single through screw thus providing a self-centering support

with a positive lock, and resulting in a degree of rigidity equivalent

to that of a solid gage. The useful life of the plug is furthermore

materially increased, as when one end is worn, the plug can be reversed

and is then, for most purposes, as good as new. The construction is protected by carefully worked out dimensional

limits, and interchangeability is insured between gaging members and

handles wherever manufactured. Details of construction will be

apparent from Figure 1, page 8, 65540°—30 2
8 AMERICAN GAGE DESIGN COMMITTEE

Range: Above 0.059 to and including 1.510 inches; Optional above 1.510 to and including

2.510 inches

Range: Above 2.510 to and including 4.510 inches Figure 1

American Gage Design Standard plain cylindrical plug gages, details of construction

9. Progressive gaging member.

10. Handle for reversible gage.

• 11. Socket head screw.

12. Locking prong.

13. Locking groove.

1. "Go" gaging member.

2. "Not go" gaging member.

3. Progressive gaging member.

4. Shank.

5. Taper lock handle.

6. Drift hole (or slot).

7. "Go" gaging member.

8. "Not go" gaging member.

14. Cross-pin hole.

15. Hexagon head screw.

16. Web.
PLUG AND RING GAGE BLANKS 9

(c) HANDLES

Handles for both taper lock and reversible gages are of the hexagonal type. However, the use of round medium-knurled handles,

while not recommended, is made optional in all sizes. Handles as designed for taper lock and reversible gages offer a

feature of economy in that they may be disassembled from gaging

members when the latter are worn out or discarded for any other

reason, and may then be reassembled with new gaging members, thus

giving them, with reasonable care, practically indefinite life.

PLUG AND RING GAGE BLANKS 11

CO CO iH

<N »0 00

I

PLUG AND RING GAGE BLANKS 13

I

9Z

o o o o o o o

g <N CO CD CO 00 00

OS C5 GO 00 00 GO GO fMOOOOOO g <M CO -^ CO 00 00 00

ooooooo «TjtHHHrHHH

g <N CO "tf CD 00 00 CO

05 O CO 00 00 GO 00 gco o o o o o o

g <M CO CD CO CO 00

!hhhh(N(N(N

ooooooo

g <N CO t*< CD 00 00 00

Ci OS GO 00 00 00 GO •gcooooooo e<Mcc*ooooooo

•N^1 x^J* Nr* \rf \oo

>-< OQ <M <M <N CO CO osiOOiQiOOOO

gCO lO 00 rH lO o io £^O whNM

»0>OOiCi»000

•§<N CCOOOr-HOO

o o

<v <v

o3 o3 9 c o o

ft a

o o

bo

#.3

53

IS

1

1

5? a

rH <N CO -tf "5 »C lO

PLUG AND RING GAGE BLANKS

PLUG AND RING GAGE BLANKS
18 AMERICAN GAGE DESIGN COMMITTEE

2. THREAD PLUG GAGE BLANKS AND HANDLES

The taper lock and reversible designs have been adopted for thread plug gage blanks and handles and follow the plain cylindrical

plug gage designs described on pages 6 and 7, with the exception that

the length of thread-gaging members is slightly different in some in- stances and the use of taper lock blanks and handles for pipe-thread

plug gages is standard to and including 2 inches nominal pipe size. General details of construction will be apparent from Figure 3. Data sheets for thread plug gages are set forth on pages 19 to 28,

and a separate table specifying the taper lock handles and gaging

members for pipe-thread plug gages is set forth on page 24.

4 6 5

Range: No. to and including 1.510 inches

7-8 10 Range: Above 1.510 to and including 2.510 inches

Range: Above 2.510 to and including 4.510 inches Figure 3.

American Gage Design Standard thread plug gages, details of construction

1. "Go" gaging member.

2. "Not go" gaging member.

4. Shank.

5. Taper lock handle.

6. Drift hole (or slot)

.

7. "Go" gaging member.

8. "Not go" gaging member.

10. Handle for reversible i 11. Socket head screw.

12. Locking prong.

13. Locking groove.

14. Cross-pin hole.

15. Hexagon head screw.

16. Web.

20 AMERICAN GAGE DESIGN COMMITTEE
PLUG AND KING GAGE BLANKS 21

o

g

2x

-2

v.

to to n e«

X?l \N NT1 X«>

' r-fX i-K H\»\ USX ^ C^X ^ ^

o

^ o HZ

o o o © ~» T—I HH «<N CO rJH CD Sd • • • © 0> 0505 _co o oo "ScN CO Tt< CO

lOX t—\^Q0

1H IH «X

IN IN <N •«» eoXt° \n \m v«c

<u uix usx t-\wx <M <N H tO

3<N CO COCO

x*COX

tP (O NO h t—

i

^ ^x

aoXT1 X0O X-1 0(0 to ^ 1--X USX MXXjH XrH X^

;^ ^ ^ 2x ^ ^2 2x ^2x^ HH _O

(NO

CD 3x ^
AMERICAN GAGE DESIGN COMMITTEE
PLUG AND RING GAGE BLANKS 23

oooooooooo , ,H rH H i-l H rH H tH rH tH i-H

; <N CO tJ< CO 00 00 00 00 00 00 00 00 o o o o

00 00

- 05 OS 00 00 00 00 00 00 00 00 0000 0000 •Scoooooooooo oo oo .£ <N CO tH CO 00 00 00 00 00 00 0000 0000

^ ^ >—i i—i CN C^C<J <N <N <N <N <N <N ^oooooooooo ooo o

j; (M CO CO 00 00 00 00 00 00 000000 00 © O 00 00 00 00 00 00 00 OO OO OO OO 00 "Sco o o o o o o o o o ooo o

^ <M CO CO 00 00 00 00 00 00 000000 00 d

' " :'

I \00 \00 \00 \00 VpO -xp0\Q0\Q0 V°0

, n\ «\co\oSNco\co\oS\ co\m\c5x co\

"N't vac I

rHrHrHrHrHrH H

grf^*^ ^ ^ ^ ^ ^ .g _H ^ _H _H CM^

grHrHrH<N^^^£icb(N ?5 CO <N &

f-i

i c3 1,0

03

26

2 S

tfl o

o3

o ago

73 — IH " - o3 (h rH ,«50>0>0000000 ooo o SfflHNWrlHrilHHH HHH rH oC0*000rHi0*OOOOO 0>010 *C ^O ' "hi-hhiniNNIN <N <n" c<j o4 gO AO o io »o to o o o o ooo o C^COHINCOCOHHHH HHH rH g (N CO "5 00 rH rH lO lO »0 UJOO O

O* ' ' ' H H rH rH rH rH HM'W (M*

CO •i"

9^^ "^h rH^HOQ <M <N <N <N^C^

o So

9 «

W-53 rH CO «0 >0 »C *0 «0 IQIQIO
AMERICAN GAGE DESIGN COMMITTEE

©

Gaging

member,

use

blank

for

range s^ . . . o o o<^ hhhN

Handle No.

oinal

pipe

size viiii

lijl;

Nob Mi

lacs ! HHH(N

aot

go"

Gaging

member,

use

141

blank

for

rangeo o o

Handle No. (M CO CO

s

size S

-aa * i i i : i

Non

Vgo nj(i vpo s?q -s^
PLUG AND RING GAGE BLANKS

PLUG AND RING GAGE BLANKS

PLUG AND KING GAGE BLANKS

3. PLAIN RING GAGE BLANKS

The use of the solid ring-gage design for external size control,

being fairly well established, the committee's work on plain ring gages was concerned chiefly with matters of proportion. In the smaller

sizes of plain ring gages it was felt desirable to employ a hardened

bushing pressed into a soft gage body, in place of the one-piece ring

gage, and this design has been adopted in the range above 0.059 to and including 0.510 inch. The single piece gage is employed in all cases above 0.510 inch, but gages in sizes above 1.510 inches are

flanged, in order to eliminate unnecessary weight and facilitate handling.

No dimensional difference exists between "go" and "not go"

blanks of identical size range, but an annular groove is provided in

the periphery of "not go" blanks as a means of identification.

General details of construction are shown in Figure 5, and dimensions are given in Tables 14 and 15.
30 AMEKICAN GAGE DESIGN COMMITTEE

GO GAGE NOT GO GAGE

Range: Above 0.510 to and including 1.510 inches

GO GAGE NOT GO GAGE

Range: Above 1.510 to and including 4.510 inches

1. Body. 3. Flange.

2. Bushing. 4. Hub. Figure 5.

American Gage Design Standard plain ring gages, details of construction
PLUG AND RING GAGE BLANKS 31
32 AMERICAN GAGE DESIGN COMMITTEE


PLUG AND RING GAGE BLANKS 33

4. THREAD RING GAGE BLANKS

The committee found universal accord as to the superiority of the

adjustable thread ring gage over the solid type, with the result that

all American Gage Design Standard thread ring gage blanks are equipped with an effective device for adjusting and locking the gage

in the manufacturing or resizing processes. Of the many locking

devices considered the single-unit locking device was finally adopted

as standard, as it permits a minimum diameter of blank for a given

size range, and provides a simple adjustment and positive lock without

introducing any mechanical stresses into the gage body which might

tend to create distortion after setting. Referring to Figure 6, the

construction and operation of this device is as follows

:

The adjusting screw, 8, is threaded externally and internally and

split longitudinally. Turning this screw to the right exerts pressure on the sleeve, 2, against the shoulder in the left-hand side of the gage

here shown, thus spreading the ring. Once the ring has been properly

adjusted by means of adjusting screw, 8, the adjustment is locked by

tightening locking screw, 1. The tightening of locking screw, 1, exerts a pull between the shoulder immediately under its head and

the internal threads of the adjusting screw, 8, which causes the

adjusting screw to expand into the threads in the wall of the gage, the

thrust of this action being taken up longitudinally by the sleeve, 2,

Therefore, the clamping is accomplished by expansion of the adjusting screw equally in all directions and not by the application of any

eccentric forces that tend to distort the gage or upset the adjustment.

The locking pressure, it is seen, is taken up centrally in the locking screw itself as the reacting support is directly under the head of the

locking screw in the form of a shoulder in the gage. The sleeve, 2,

being accurately fitted, serves as a large dowel to maintain the

alignment of the gage. Three types of thread ring gage blanks have been provided as

illustrated in Figure 7, namely:

1. A thin flat disk type with one adjusting slot for all sizes and

pitches, both "go" and "not go," No. to %6 inch, inclusive.

2. A thin flat disk type with two adjusting slots for the following:

(a) All sizes and pitches, "go" and "not go," above %G to and including % inch; (b) fine pitches,1 "go" and "not go," above % to and

including 4}£ inches; (c) coarse pitches, "not go" only, above % to and including 4% inches.

3. A thick flanged type with two adjusting slots for all "go" coarse pitch gages, above % to and including 4% inches.

Dimensions for thread ring gage blanks in the range from No. to 4% unches, inclusive, and of parts for the thread ring gage locking

device, are given in Tables 16, 17, 18, and 19.

1 Specific information as to the meaning of the terms "fine pitches" and "coarse pitches," as used above,

is given in the footnote to Table 16, p, 35.
34 AMEBICAN GAGE DESIGN COMMITTEE
PLUG AND EING GAGE BLANKS 35

|i li'i.l II x s ? s s s

1

i

i lis 1 111 III till

i |l I 1 1 1 § § 1 § | | | |

i

?????????????

Ill " 1

i |l 1 1 1 ill 1 11 11 1

i

•s S, S .1 § 1 i i 1 1 I 1 g g

41

41 gslslsgglsgsT sf s" $? sf s sf s

* 1 ^

^' * • « I i * « # * # ^

|i x 1 s J 5 f a | |

N « <D *> > O (O <0

tq I:

: s ST £ ^ * 2^' X !§ » - w III

;

i

| * * * ? 1 1 c # i.x —Kf ! ! I * 1. I 1 '|x X ? S « ? X ? & JR ? ? h

jissasiBiSflsssisiniiissiia

H °%ls s s asSBSaa
AMERICAN GAGE DESIGN COMMITTEE

ooo 2 3§§§*

N M

SJO S<0 VJO vJO ^8 r-rxT-rxi-N.i-)\

N <N «* IT

© CO CO i—

I

t> OS i-i CO OOHH

CM CO CM CM 00 i-H t» CO rHCMCMCO S

CM CM O tJ< CO CM CO(—lQ» ..t^OCOrH £0 T-H rH rH O O 00 CO AO OSt-O

OS CM 00*O

OSiO001> ^iO 00HO5 uNOJ CM CO ^OOHHOO 00 -tf OS

cm co *or^

OS CM 00 H (M (M CO

CM t^OOOCO

CO"*-* I

' ©

o o o o ££££

CM "4h CO rH 2 ^Xu^-eJ?. 6

co co co ia

co coo co «C01>rHCO |hh cm <m o cooobOS CM CO

CM 00 «tf CO

CO CO ^ lO

^coi>oco

rH CM CM

CO 1><N r^- COCS CM © CMt^^CO

CO CO lO O 00 00

CO CM CO "3

os cm oo

Jii-H rH CM CM

OS O »C OS 1>ICI>00

xsJH O CO 00 COtH^io

CM CD CO © O rjH CO

"StH OS CM 00 ^ i—i t—i CM CM O'

'

1*5 TjH OS OS iO <N rfi "O

"Ji O CO 00 CO ^t"tf lO

.J SK oo cq cm o oo 52 ^ CM | CM I CM rH 00 rH r-K»tf\ c^n^x^xiox 6 6
PLUG AND RING GAGE BLANKS 37

Table 18.Thread ring gage sleeves r

Minimum Maximum

No. 43 (0.089) No. 32 (.116) _ No. 27 (.144) _ No. 10 (.193). No. 2 (.221) __ F (.257) P (.323) 2%4 (.391)___.

Inch

0. 1368

. 1808

. 2148

. 2718

. 3337

. 3887

. 4507

. 5707

Inch

0. 1370

. 1810

. 2150

. 2720

. 3340

. 3890

. 4510

. 5710

Inches%

Me%

74 IKe

1/2

Inch

0. 010

. 020

.020

Vz2 VZ2

YZ2 %*

i Tolerance on length C=±XM inch. Table 19.

Thread ring gage locking screws

Tl 5+7

3*

A D

Pitch diameter c E F H J K

Size Min. Max.

Min. Max.

Inch Inch Inches Inch Inch Inch Inch Inch Inch Inch Inch No. 2-64___ 0. 0745 0. 0759 29/6 4 %4 0. 0840 0. 0860 Vie %2 YZ2 %4 0. 010 No. 4-48___ . 0969 . 0985 % %2 . 1100 . 1120 He 3/l6 YZ2

3/64 . 020 No. 6-40___ . 1201 . 1218 1 % . 1360 . 1380 Ke 7A2 3/64 Me . 020 No. 10-32 __ . 1678 . 1697 IKe % . 1880 . 1900 Ke %2 ft Me M2 No. 12-28__ . 1906 . 1928 P/l6 %2 . 2140 . 2160 %

U/Z2 Me Me M32 K-28 . 2246 . 2268 l

23/64 3/l6 . 2480 . 2500 9/l6 13/32 Me %4 M32

5/i6-24 . 2830 . 2854 l

23/32 % . 3105 . 3125 %

15/32 5/64

3/32 %4,

3/8-24 . 3455 . 3479 2

3A He .3730 . 3750 %

19/Z2 5/64 VZ2 %4

1 Tolerance on length B= inch.
38 AMERICAN GAGE DESIGN COMMITTEE

3 7 2 14

GO NOT GO

Bange: No. to and including 0.365 inch, "go" and "not go" gages, all pitches 3 7 2 14

GO NOT GO

Range: 0.365 to and including 0.510 inch, "go" and "not go" gages, all pitches; 0.510 to and including

4.510 inches, "go" and "not go" gages, fine pitches; 0.510 to and including 4.510 inches, "not go" gages

only, coarse pitches

Range: 0.510 to and including 4.510 inches, "go" gages only, coarse pitches Figure 7.

American Gage Design Standard thread ring gages, details of construction, range No. to 4}i inches, inclusive

1. Locking screw.

2. Sleeve.

3. Adjusting screw.

4. Body.

5. Adjusting slot.

6. Adjusting slot terminal hole.

7. Locking slot.
PLUG AND RING GAGE BLANKS 39

VII. APPENDIX

1. TAPER PLUG AND RING GAGES FOR CHECKING TAPER LOCK

HANDLES AND GAGING MEMBERS

It has been deemed advisable to formulate specifications for a complete set of finished gages for inspecting the taper shanks and

handles of gages of taper lock design.

A complete set consists of a taper plug and a taper ring for each

size range. General details of construction will be apparent from

drawings, and Tables 20 and 21, on the following pages,
AMERICAN GAGE DESIGN COMMITTEE

It-2

I i

4 .-

-is

_i

i

88°

O

IQIOO

,<N O GO

OiOO O (N iO <C SO <MCO

OCOH

<N *C 00

o»oo

iO o

§oooo

o o o

00 00 00 <o o o u£d •

o»oo

CO O CO "iO CO CO d *

'

CO CO i—i <N *C GO

o

88.
PLUG AND KING GAGE BLANKS

i

9

WiOOOO

O O O (N

Handle

No. i—I C5J CO Tt< »o

to (0 M W

<;

t->

Max. o o o o o Tfrl ^ h rH tH ^(M <M CO tJH

Min. O 05 C5 00 00 co co ^(NlNCO^r^

Kl 6

Inch

o OOOOO OOOiOO _,*o *o »o uNNNGOO

*.d " * -

to to

OOOOO ^ rt rH (NCOThOOO

Handle

size

No.

th csi co »d
AMERICAN GAGE DESIGN COMMITTEE o o o o o 00 00 CD CO CO

tJH OS OS OS .OOOOO

£0

CN CN CO CD )\HVOOOOO CO 00 CO i-t CO 2 OS OS !>• Os •£l>l>00OsO

TjiHHiHH OOOOO

<N CO CO 00 £0

all

w cd £

ft

03 d © wd,d

® 0*"

sag

glS

>-< d § S CD Ji-2 ft

<1 big

CD

>>J3 CD

CD K 3

,d 52 h h

00 d s ©

M 9

£3 ft p ©

ftcD^O

5-oft-n d £ ®

8 £ ft 5

•a2.S <D

pi

"JT a> 9

•31*

5-310 B^2fl

9 wg>

S? 3 So

I 13

1 ail
PLUG AND RING GAGE BLANKS 43

2. OFFICIAL MONOGRAM FOR DESIGNATING PRODUCTS MADE TO

AMERICAN GAGE DESIGN STANDARDS

The optional use of the monogram shown in Figure 8, to identify

gages made to American Gage Design Standards, is sanctioned by

the committee. The monogram, it will be noted, consists of the initials "AD," the right hand side of the "A" and the straight side of the

"D" being common. The monogram, if used, should be placed

adjacent to the maker's trade-mark.

Figure 8.

Official monogram for des- ignating products made to American

Gage Design Standards

3. APPLICATION OF AMERICAN GAGE DESIGN STANDARDS TO

SPECIAL TYPES OF GAGES, RECOMMENDED PRACTICE

While the American Gage Design Standards have been adopted

with specific types and sizes of gages in mind, it is recommended

that standard blanks and handles be used wherever practicable in

the design and manufacture of special gages, the design of which did

not come within the scope of the committee's work.

Where lengths and diameters are entirely special and blanks of

standard dimensions can not be utilized, it is further recommended

that standard handles and fittings be used.

Observance of this practice will tend to reduce costs and facilitate procurement.

VIII. INDEX

Page

Adjusting slots (definition) 6 American Gage Design Committee 1 members 3 purpose 1 organization 1,3 American Gage Design Standards 1 advantages 2 availability 1 applications to special-type gages 43

(definition) 5 details of construction 6 development of 1 effective date. 2

official monogram _ . . . . 43 Conference, general 2 Cross pin 15,27 hole 8,18 Definitions 5 Development of standards 1 Drift hole (or slot) 7

(definition) 6

(illustration) 8,18 Flange, ring gage 29

(definition) 6

(illustration) __ 30 Gages for taper lock gages 39 Gaging member (definition) 5 section (definition) 5 "Go" and "not go" gages 7,29,33 Groove for "not go" gages 7,29 locking 5 Handle, gage 9

(definition) 6

(description) 9 hexagon _ 9

(illustration) 8,18 knurled 9 Hole, cross-pin 8, 18

drift (definition) 6 Holes, lightening (definition) 6 Hub (definition) 6 Lightening holes (definition).. 6 Locking device, thread ring gages (defini- tion) 6

(illustration) 33,38 groove 5 prong.. 5

slot (definition).. 6 Member, gaging 5 Monogram, official 43 Not go gages, groove to distinguish 7,29

Official monogram 43 Optional use of taper lock gages 7

Pin, cross 17,27 Pipe thread plug gages 18, 24 Pitches, coarse and fine.,.. „„„,,„„„* 33,35

Page

Plain cylindrical plug gages 6

(definition)... 5

(description) 6

(illustration) 8

ring gages. 29 bushing in 29

(definition) 6

(description) 29 flanged .». 29

(illustrations) 30

solid design 29 Plug gage, plain cylindrical 6

(definition) 5

(description) 6 progressive 5 pipe thread... 18,24 progressive 5 reversible 5,

taper lock 5,7 thread . 5,18

(definition) 5 (description) __ 18 pipe 18,24 Progressive cylindrical plug gage (definition).. 5 gaging member 8 Prong, locking 5 Reversible plug gage (definition) 5 Ring gage, plain (definition) 6 thread (definition) 6

Section, gaging 5 Shank (definition) 5

Slot, drift (definition) 6 locking (definition) 6

Slots, adjusting (definition). 6 Special types of gages 43 Standards. (See American Gage Design.) Taper lock (definition) 5 design (description) 7 optional range 7 standard range 7,18 Terminology 5 Thread plug gage. 18

(definition) 5

(description) 18

(illustration) 18 ring gage 33 adjustable design 33 adjusting screws 33, 36

(definition) 6

(description) 33

(illustration). 33,38 locking device 33,38 locking screws 33,37 types of, three. 33 Web — 8,18 Wink 7 45 o



i