These square flanged ball bearing units are compliant with Japanese Industrial Standards (JIS). They consist of an insert bearing, locked to the shaft with an adapter sleeve, which enables the bearings to operate at higher speeds and run more smoothly in 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. The adapter sleeve is not included in the unit and should be ordered separately.
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| Compliance with standard |
JIS
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| Purpose specific |
For material handling applications
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| Material, housing |
Cast iron
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| Sealing, bearing |
Seal and flinger on both sides
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| Sealing type, bearing |
Contact, standard
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| Sealing, unit |
Without
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| Coating |
Without
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| d |
55 mm
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Bore diameter |
|---|---|---|
| d1 |
≈ 75.64 mm
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Outer diameter of inner ring |
| d3 |
80 mm
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Outside diameter of lock nut |
| A |
48 mm
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Overall width |
| A1 |
18 mm
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Flange width |
| A3 |
3.2 mm
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Depth of centring recess |
| B |
42.5 mm
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Width of inner ring |
| B1 |
42.4 mm
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Overall bearing width |
| B1 |
62 mm
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Width of sleeve |
| Db1 |
140 mm
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Top external diameter |
| Db2 |
140 mm
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Base external diameter |
| Dc |
161.9 mm
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Diameter of housing centering recess |
| J |
143 mm
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Distance between attachment bolts |
| L |
175 mm
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Overall length |
| N |
19 mm
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Diameter of attachment bolt hole |
| s1 |
33.7 mm
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Distance from locking device side face to raceway centre |
| T |
62.8 mm
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Overall unit width |
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Value specified for s1 is approximate and before the sleeve is driven into the bearing bore (sleeve and inner ring bore at starting position).
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| RG |
1/4-28 UNF
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Housing thread for grease fitting |
|---|---|---|
| R1 |
28.5 mm
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Axial position of the housing thread |
| DN |
6.5 mm
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Diameter of head sphere of grease fitting |
|---|---|---|
| SWN |
7 mm
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Hexagonal key size for the grease fitting |
| GN |
1/4-28 SAE-LT
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Thread of grease fitting |
| J6 |
161 mm
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Distance of dowel pins |
|---|---|---|
| J7 |
49.5 mm
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Axial offset of dowel pins |
| N4 |
4 mm
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Recommended diameter for dowel pins |
| Basic dynamic load rating | C |
52.7 kN
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|---|---|---|
| Basic static load rating | C0 |
36 kN
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| Fatigue load limit | Pu |
1.53 kN
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| Limiting speed |
3 400 r/min
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| Mass bearing unit |
3.65 kg
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| Associated spanner |
HN 12
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| Recommended lock nut tightening angle | α |
95 °
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| Recommended diameter for attachment bolts, mm | G |
16 mm
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| Recommended diameter for attachment bolts, inch | G |
0.625 in
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