HE20E-002B

Instruction Manual
Insert Bearing Units
Silver Series(Set screws locking type)Table of ContentsPage

1.

Scope of application ......................................................................................................................................................................... 1

2.

Name of parts and functions ............................................................................................................................................................ 2

3.

Selection of shafts ............................................................................................................................................................................ 3

4.

Mounting method .............................................................................................................................................................................. 4

5.

Stainless-steel cover attachment/removal method ......................................................................................................................... 51)

Attaching the cover ...................................................................................................................................................................... 52)

Removing the press-fit locking cover .......................................................................................................................................... 66.

Inspection.......................................................................................................................................................................................... 71)

Noise ............................................................................................................................................................................................ 72)

Rise of temperature ..................................................................................................................................................................... 77.

Lubrication......................................................................................................................................................................................... 88.

Replacement of bearing ................................................................................................................................................................... 9Insert Bearing Units (Set screws locking type)

1. Scope of application
This instruction manual applies to the insert bearing units shown in Table 1.
Table 1Silver Series

Stainless-Steel Silver Series

Pillow block unit

Rhombic flange
unit

Pillow block unit

Rhombic flangeunit

KP000
KP001
KP002

KFL000
KFL001
KFL002

KP000C(E)KP001C(E)KP002C(E)KFL000C(E)KFL001C(E)KFL002C(E)

KP003
KP004
KP005

KFL003
KFL004
KFL005

KP003C(E)KP004C(E)KP005C(E)KFL003C(E)KFL004C(E)KFL005C(E)KP006

KFL006

KP006C(E),Y

KFL006C(E),Y

Remarks 1: “,Y” indicates units that have a press-fit cover and do not use a clip.
Remarks 2: This instruction manual also applies to the insert bearing units marked with auxiliary marks (Note 1) andaggregation marks (Note 2) in addition to the standard products shown in Table 1.1.
(Note)

1. Special and change marks showing accuracy, shape, additional processing, etc. for bearings, housings andmain parts.
2. Abbreviated marks for special parts whose nominal number consists of many characters and is complicated.

1

Insert Bearing Units (Set screws locking type)

2. Name of parts and functionsRubber seal

Outer ring
Housing
Set screw

Inner ring

Steel ball
Retainer

Rubber seal:

Prevents grease leakage and dust and moisture intrusion because it is secured to the outer ringand the lip part comes in contact with the inner ring.

Set screw:2

Secures the insert bearing and shaft.

Insert Bearing Units (Set screws locking type)

3. Selection of shafts
For the shaft on which the insert bearing unit will be mounted, use one that is not bent and does not have burrs, andperform chamfering of the shaft ends. The press-fitting of the inner ring and shaft is mostly performed by a running fit ingeneral for convenience in handling. The values shown in Table 3.1 are considered appropriate for the shaft dimensional
tolerance in the case of loose press-fitting.
If high-precision operation and high-speed rotation are required, it is better to perform the press-fitting between the innerring and shaft by interference fit. The values shown in Table 3.2 are considered appropriate for the shaft dimensional
tolerance in the case of tight press-fitting.
Furthermore, when the bearing and shaft will be used tightly press-fitted, the initial clearance of the bearing must be
designed to be larger than those of the standard specifications.
Table 3.1: Shaft dimensional tolerance (for loose press-fitting)
Shaft diameter (mm)Over61018Or less101830Shaft dimensional tolerance (μm)
js7±7.5±9±10.5

h70 to -15
0 to -18
0 to -21

Remarks: In general, js7 shall be applied.
Table 3.2: Shaft dimensional tolerance (for tight press-fitting)
Shaft diameter (mm)Shaft dimensional tolerance (μm)

OverOr lessm6

61018101830+15 to +6+18 to +7+21 to +83

Insert Bearing Units (Set screws locking type)

4. Mounting method
1) Slide the insert bearing unit onto the shaft slowly and bring it to the predetermined position.
2) Mount the insert bearing unit on the machine base and secure it firmly with bolts. (Refer to Table 4.1.)
3) Tighten the set screws uniformly with a hexagonal wrench key and secure the unit to the shaft. (Refer to Table 4.2.)
Remarks: 1. Before sliding the insert bearing unit onto the shaft, check that the tips of set screws do not protrude fromthe inside diameter of bearing. If a tip protrudes, loosen the set screw.
2. When sliding the insert bearing unit onto the shaft, be careful that the unit does not get twisted. In addition,
do not tap the inner ring side or the rubber seal directly.
3. The values shown in Table 4.1 are considered appropriate for the tightening torque for bolts for the bearing
housing.
4. The machine base to which the unit is mounted must be rigid enough and flat to prevent the bearing housingfrom be deformed. (Flatness: 0.1mm or lower)
5. The values shown in Table 4.2 are considered appropriate for tightening torque of set screws.
If the set screws are tightened excessively, deformation of the inner ring may cause the rotational
accuracy to be reduced and the inner ring to be cracked.
6. Use washers to prevent the housing from being damaged when fixing the bearing unit on the mounting basewith bolts.
Table 4.1: Tightening torque of housing mounting bolts (Reference value)
Nominal size of screw

Torque(N•m)

M6
M8
M10

2.8 to 4.5
6.9 to 11
14 to 22

Table 4.2: Tightening torque of set screws and axial load-bearing capacity of unit
Nominal numberof applicablebearingNominal sizeof set screw

Nominal size ofhexagonal
wrenchTightening torque(N•m)

Axial loadbearing capacity(kN)

K000, K001

M3×0.35

1.5

0.59

0.35

K002, K003

M4×0.5

2

1.47

0.43

K004 to K006

M5×0.5

2.5

2.94

0.72

4

Insert Bearing Units (Set screws locking type)

5. Stainless-steel cover attachment/removal method
1) Attaching the cover*Attach the cover after completion of attachment of the unit main body.

*

Apply an amount of grease corresponding to 1/3 to 1/2 of the volume of the space inside the cover to that space.
(Fig. 5.1)

In the case of clip-locking type•

Pillow block (Fig. 5.2)

(1)

Hook the claw on one side of the clip into the groove on one side of the cover.

(2)

Push the claw on the other side of the clip strongly into the cover groove on the opposite side.

•Rhombic flange (Fig. 5.3)

(1)

Hook the L-shaped claw of the clip onto the clip seat of the bearing housing.

(2)

Push the other claw strongly into the cover groove.
*

If it is difficult to install the clip, first hook the claw of the clip into the cover groove and then push it into theclip seat of the bearing housing.

In the case of press-fit locking type(1)

Press the cover against the spigot joint of the bearing housing and push it into the spigot joint with yourfingers. (Photo 5.4)

(2)

Tilt the cover and push the lower side of the outer rim of the cover into the spigot joint of the bearing housingwith your fingers, and push the outer rim at the opposite position into the bottom of the slit using a tool such asa screwdriver. (Photo 5.5)

(3)

Repeat for other positions of the cover, pressing them in on both sides of the symmetrical position in sequencewith a screwdriver, etc. to make sure the entire circumference of the cover is pressed in uniformly.

Pack with grease(2) Push strongly(1)(2) Push
strongly(1)

Fig. 5.1

Fig. 5.2

Photo 5.4

Photo 5.5

Fig. 5.3

5Insert Bearing Units (Set screws locking type)2) Removing the press-fit locking cover
Apply the screwdriver to the boundary between the outer cylinder and the cone of the cover, and tilt it in the axial
direction. Tap with a plastic hammer to remove the cover. (Photo 5.6)

Photo 5.6
Note
1. For the inner cover with a rubber seal, slide the cover onto the shaft in advance before mounting the unit mainbody.
2. In order to improve dust and moisture resistance, apply grease also to the surface of the shaft that comes into
contact with the spigot joint of the bearing housing and the lip part of the rubber seal in advance.
3. About press-fit locking cover
The removed cover can be reused if it is not deformed, but if the cover is deformed such that the diameter of theouter rim becomes smaller when it is removed, the interference with the bearing housing spigot joint is reduced
and the cover is easier to remove, so it is recommended to replace it with a new cover.

6Insert Bearing Units (Set screws locking type)

6. Inspection
After finishing mounting the insert bearing unit, inspect whether the mounting conditions are appropriate or not.
First, turn the shaft by hand to check that the insert bearing unit rotates smoothly. If no problem is observed, rotate it byelectric power to inspect for noise or temperature increases.
1) NoiseTouch the housing with a listening rod or screwdriver and listen for noises during operation to check for abnormalities.
(Photo 6.1)
For normal operation conditions, a smooth rotation noise is generated, but if there is an abnormality in mounting, anabnormal noise may be generated.
2) Rise of temperature
Measure the temperature on the outer circumferences of the bearing outer ring or housing during operation. (Photos
6.2 and 6.3)
The rise of temperature reaches saturation 2 to 3 hours after start of operation and the insert bearing unit reaches itsregular conditions; however, if there are abnormalities in mounting, etc., the temperature will increases excessively,
which will prevent the insert bearing unit from reaching its regular conditions.
Inspect the above items during commissioning and start operating the insert bearing unit fully only after checking that
there is no abnormality.
Further, it is recommended that inspections also be performed periodically at the predetermined interval during
operation to detect failures in the bearings at an early stage.
In addition, monitoring to check that there are no changes in noise or increases in temperature by comparing thedifferences between the results of the current periodic inspections and other inspections is an effective measure forpreventing accidents and damage to machinery.
For main abnormalities and countermeasures during commissioning and periodic inspection, check the general
catalogue for insert bearing units and the page “Inspection and malfunction(https://www.asahiseiko.co.jp/qa/bearings.html)” on our website.

Photo 6.1: Checking the rotationnoise with a listening rod

Photo 6.2: Temperature
measurement (contact type)

Photo 6.3: Temperature
measurement (non-contact type)7

Insert Bearing Units (Set screws locking type)

7. Lubrication
This unit insert bearing has been factory-lubricated with the grease shown in Table 7. This unit uses the lubrication-freetype.
Table 7: Properties of standard factory-lubricated grease
TypeModelProduct name

Manufacturer name

NLGI
No.

SoapbasedgreaseDroppoint(°C)

Usabletemperaturepoint(°C)

For generaluse

KP, KFL

Alvania Grease S

Shell Lubricants Japan K.K.

3

Li

182

-25 to +135

* The usable temperature point of this unit is -10 to + 80°C.

8Insert Bearing Units (Set screws locking type)

8. Replacement of bearing
When replacing the insert bearing unit with a new one, if either the bearing or housing is slightly damaged, replacement ofeither one is possible instead of replacing both ones.
When assembling the bearing into the housing, position the bearing outer ring at right angles to the bearing seat, andpress-fit it into the notched part of housing, and then turn the bearing. (Photos 8.1, 8.2 and 8.3)

Notched part ofhousing

Photo 8.1

Photo 8.2

Photo 8.3

9Jan. 2023