These square 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 material handling applications
|
| Material, housing |
Cast iron
|
| Sealing, bearing |
Seal and flinger on both sides
|
| Sealing type, bearing |
Contact, standard
|
| Sealing, unit |
Without
|
| Coating |
Without
|
| d |
19.05 mm
|
Bore diameter |
|---|---|---|
| d1 |
≈ 28.2 mm
|
Outer diameter of inner ring |
| A |
25.5 mm
|
Overall width |
| A1 |
11 mm
|
Flange width |
| A3 |
3.2 mm
|
Depth of centring recess |
| 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 |
| Db1 |
58 mm
|
Top external diameter |
| Db2 |
64 mm
|
Base external diameter |
| Dc |
68.3 mm
|
Diameter of housing centering recess |
| J |
64 mm
|
Distance between attachment bolts |
| L |
86 mm
|
Overall length |
| N |
12 mm
|
Diameter of attachment bolt hole |
| s1 |
18.3 mm
|
Distance from locking device side face to raceway centre |
| T |
33.3 mm
|
Overall unit width |
| RG |
1/4-28 UNF
|
Housing thread for grease fitting |
|---|---|---|
| R1 |
17 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 |
| J6 |
74 mm
|
Distance of dowel pins |
|---|---|---|
| J7 |
16 mm
|
Axial offset of dowel pins |
| N4 |
4 mm
|
Recommended diameter for dowel pins |
| 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 |
0.53 kg
|
| Set screw | G2 |
1/4-28 UNF
|
|---|---|---|
| Hexagonal key size for set screw |
3.175 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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