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Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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FAG B7028E.TPA.P4.UL super-precision angular contact spindle bearing, 140 x 210 x 33 mm, 25° contact angle, light preload, phenolic cage, P4S class.
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| MFR / Brand | FAG |
|---|---|
| MPN | B7028E.TPA.P4.UL |
| Model | B7028 E.TPA.P4.UL / 128HE / 2128HDL / 7028ACDGA/P4A |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 140 mm |
| OD | 210 mm |
| Width | 33 mm |
| Material | Chrome steel |
|---|---|
| Series | B70 |
| Preload | Light, 1,336 N |
| Base Number | B7028 |
| Industry Terms | super precision spindle bearing, machine tool spindle bearing, 25 degree angular contact, universally matchable, P4S ABEC 7 |
| Common Misspellings | B7028ETPAP4UL, B 7028 E TPA P4 UL, B7028ETPA, B7028-E-TPA-P4-UL |
| Bore Shaft Size | 140 mm |
| Mpn Variants | B7028E.TPA.P4.UL, B7028-E-T-P4S-UL, B7028E.T.P4S.UL, B7028ETPAP4UL, B7028 E TPA P4 UL, B-7028-E-TPA-P4-UL, B7028E |
| Compatible With Replaces | B7028-E-T-P4S-UL replaces B7028E.T.P4S.UL and B7028E.TPA.P4.UL |
| Precision Class | P4S |
| Dynamic Load Rating C1 | 145,000 N (145 kN) |
| Additional Attributes | Fatigue load limit 8,600 N; axial stiffness at light preload 339 N/um; shaft shoulder diameter 152 mm h12; housing shoulder diameter 199 mm H12; ra max 2 mm; r min 2 mm; pressure cone apex distance 57.3 mm; grease injection pitch diameter 161.6-169.2 mm |
| Min Temp | -30 °C |
| Cage Type | Machined |
| Dynamic Load Rating | 145,000 N (145 kN) |
| Static Load Rating | 108,000 N (108 kN) |
| Precision Rating | P4S |
| Rolling Elements | Balls |
| Max Temp | 100 °C |
| Item Weight | 3.288 kg (7.25 lb) |
| Cage Material | Phenolic (fabric-base laminate) |
| Limiting Speed | 5,600 rpm grease; 9,000 rpm oil |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Part Number | B7028E.TPA.P4.UL |
| Closure Type | Open |
| Cross Reference 1 | FAG B7028-E-T-P4S-UL - current designation |
|---|---|
| Cross Reference 2 | NSK 7028A5TYNSULP4 - polyamide cage |
FAG B7028E.TPA.P4.UL super-precision angular contact spindle bearing, series B70. Single bearing, open, universally ground for pair and set mounting, machined phenolic cage, light preload. Unit Quantity: 1 Pc. Country of Origin: Germany.
B70 — Schaeffler spindle bearing series, ISO 70 diameter series.
E — 25° contact angle.
TPA, T — machined fabric-base laminate (phenolic) cage.
P4, P4S — tolerance class; Schaeffler lists the current designation with P4S.
UL — U: universally ground single bearing; L: light preload, 1,336 N.
Bore Diameter: 140 mm. Outside Diameter: 210 mm. Overall Width: 33 mm. Contact Angle: 25°. Precision Class: P4S. Cage Material: Phenolic (fabric-base laminate). Cage Type: Machined. Preload: Light, 1,336 N. Dynamic Load Rating (Cr): 145,000 N. Static Load Rating (C0r): 108,000 N. Fatigue Load Limit (Cur): 8,600 N. Limiting Speed: 5,600 rpm grease; 9,000 rpm oil. Axial stiffness at light preload: 339 N per micrometre. Item Weight: 3.288 kg (7.25 lb). Operating temperature range: -30 °C to 100 °C. Rolling Elements: Balls. Closure Type: Open.
Shaft Shoulder Diameter: 152 mm to h12. Housing Shoulder Diameter: 199 mm to H12. Maximum Recess Radius (ra max): 2 mm. Minimum Chamfer Dimension (r min): 2 mm. Distance between the pressure cone apexes: 57.3 mm. Grease injection pitch diameter: 161.6 mm to 169.2 mm.
Schaeffler’s current designation is B7028-E-T-P4S-UL, which replaces both B7028E.T.P4S.UL and B7028E.TPA.P4.UL. Cross-references: FAG B7028-E-T-P4S-UL (current designation); NSK 7028A5TYNSULP4 (25°, polyamide cage).
Contact Angle: 25°, set by the E in the designation.
Dynamic Load Rating (Cr): 145,000 N. Static Load Rating (C0r): 108,000 N. Limiting Speed: 5,600 rpm with grease, 9,000 rpm with oil.
U marks a universally ground single bearing and L marks light preload (1,336 N).
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