These round flanged ball bearing units are compliant with Japanese Industrial Standards (JIS). They consist of an insert bearing, with an extended inner ring and set screw locking, and are suitable for applications where the direction of rotation is constant or alternating. The bearing is mounted in a cast iron housing, which can be bolted to a machine wall or frame. Ball bearing units can accommodate moderate initial misalignment, but normally do not permit axial displacement.
| Compliance with standard |
JIS
|
| Purpose specific |
For agricultural applications
|
| Material, housing |
Cast iron
|
| Sealing, bearing |
Seal and flinger on both sides
|
| Sealing type, bearing |
Contact, standard
|
| Sealing, unit |
Without
|
| Coating |
Without
|
| d |
20 mm
|
Bore diameter |
|---|---|---|
| d1 |
≈ 28.2 mm
|
Outer diameter of inner ring |
| A |
25.5 mm
|
Housing width |
| A1 |
7 mm
|
Flange width |
| A3 |
5 mm
|
Height of spherical seat centre |
| B |
31 mm
|
Width of inner ring |
| B1 |
31 mm
|
Overall bearing width |
| B4 |
4.5 mm
|
Distance from locking device side face to thread centre |
| Db |
61 mm
|
External diameter |
| Dc |
62 mm
|
Centering diameter |
| J |
78 mm
|
Pitch diameter of attachment bolts |
| J1 |
55.2 mm
|
Distance between attachment bolts |
| L |
100 mm
|
Overall width |
| N |
12 mm
|
Length of attachment bolt hole |
| s1 |
18.3 mm
|
Distance from locking device side face to raceway centre |
| T |
28.3 mm
|
Overall unit width |
| RG |
1/4-28 UNF
|
Housing thread for grease fitting |
|---|---|---|
| R1 |
14.5 mm
|
Axial position of the housing thread |
| DN |
6.5 mm
|
Diameter of head sphere of grease fitting |
|---|---|---|
| SWN |
7 mm
|
Hexagonal key size for the grease fitting |
| GN |
1/4-28 SAE-LT
|
Thread of grease fitting |
| Basic dynamic load rating | C |
12.7 kN
|
|---|---|---|
| Basic static load rating | C0 |
6.55 kN
|
| Fatigue load limit | Pu |
0.28 kN
|
| Limiting speed |
8 500 r/min
|
|
|
Limiting speed with shaft tolerance h6
|
| Mass bearing unit |
0.68 kg
|
| Set screw | G2 |
M6x0.75
|
|---|---|---|
| Hexagonal key size for set screw |
3 mm
|
|
| Recommended tightening torque for set screw |
4 N·m
|
|
| Recommended diameter for attachment bolts, mm | G |
10 mm
|
| Recommended diameter for attachment bolts, inch | G |
0.375 in
|
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