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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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Matched pair of super-precision angular contact ball bearings, 40 x 68 x 15 mm, 25° contact angle, phenolic cage, ABEC 7 / P4. FAG B7008E.TPA.P4.DUL, 2 Pcs.
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| MFR / Brand | FAG |
|---|---|
| MPN | B7008E.TPA.P4.DUL |
| Model | B 7008 E TPA P4 DUL / 3MM9108WI CR DUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 40 mm |
| OD | 68 mm |
| Width | 15 mm |
| Material | Chrome steel |
|---|---|
| Series | B70 |
| Preload | Universally matchable; light 141 N, medium 543 N, heavy 1,170 N per pair |
| Base Number | B7008 |
| Total Width | 30 mm |
| Mpn Variants | B7008E.TPA.P4.DUL; B7008ETPAP4DUL; B-7008-E-TPA-P4-DUL; B 7008 E TPA P4 DUL; B7008-E-T-P4S-UL; 7008E |
| Arrangement Configuration | DUL — matched duplex set, universal grinding |
| Precision Class | ABEC 7 / P4 |
| Min Temp | -30 °C |
| Cage Type | Machined |
| Dynamic Load Rating | 19,900 N |
| Static Load Rating | 10,600 N |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 100 °C |
| Item Weight | 0.38 kg (0.83 lb) |
| Cage Material | Phenolic |
| Limiting Speed | 20,000 rpm grease; 30,000 rpm oil |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Internal Clearance | N/A |
| Lubricant | Grease or oil |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25° |
| Mounting Arrangement | Universal — back-to-back, face-to-face or tandem |
| Bearing Material | Chrome steel |
| Part Number | B7008E.TPA.P4.DUL |
| Cross Reference 1 | SKF 7008 ACD/P4ADGA - 25 deg, extra light preload |
|---|---|
| Cross Reference 2 | NSK 7008A5DB - 25 deg, preload class differs |
FAG B7008E.TPA.P4.DUL is a matched pair of super-precision spindle angular contact ball bearings, supplied as one universally ground duplex set of 2 pieces. Open bearings, 25° contact angle, machined phenolic cage.
B70 — Schaeffler’s spindle bearing series in the light 70 section.
7008 — ISO size code. Bore 40 mm, outside diameter 68 mm, width 15 mm.
E — Contact angle 25°. On a B70 or B719 designation the E is an angle code.
TPA — Fabric-base laminate phenolic cage, machined.
P4 — Precision Class: ABEC 7 / P4.
DUL — Duplex set of two bearings, universally ground, supplied matched.
Bore Diameter: 40 mm.
Outside Diameter: 68 mm.
Overall Width: 15 mm per bearing.
Contact Angle: 25°.
Number Of Rows: 1 per bearing.
Rolling Elements: Ball.
Bore Type: Straight.
Closure Type: Open.
Bearing Material: Chrome steel.
Item Weight: 0.19 kg (0.42 lb) per bearing, 0.38 kg (0.83 lb) for the pair.
Dynamic Load Rating: 19,900 N per bearing.
Static Load Rating: 10,600 N per bearing.
Limiting Speed: 20,000 rpm grease; 30,000 rpm oil.
Fatigue load limit, radial: 1,130 N.
Precision Class: ABEC 7 / P4.
Cage Material: Phenolic.
Cage Type: Machined.
Lubricant: grease or oil.
Operating temperature range: -30 °C to +100 °C.
Series: B70. Base Number: B7008.
Unit Quantity: 2 Pcs.
Preload per matched pair: light 141 N, medium 543 N, heavy 1,170 N.
Mounting Arrangement: Universal — the pair mounts back-to-back (O), face-to-face (X) or tandem and reaches the published preload on assembly without shims. The set is preload-adjusted rather than clearance-set.
25° duplex sets in the 40 x 68 x 15 mm size: SKF 7008 ACD/P4ADGA (extra light preload), NSK 7008A5DB (preload class differs). Also marked B7008E.TPA.P4.DUL, B7008ETPAP4DUL, B-7008-E-TPA-P4-DUL, B 7008 E TPA P4 DUL, B7008-E-T-P4S-UL, 7008E.
Bore Diameter: 40 mm. Outside Diameter: 68 mm. Overall Width: 15 mm per bearing.
Dynamic Load Rating: 19,900 N per bearing. Static Load Rating: 10,600 N per bearing. Limiting Speed: 20,000 rpm grease; 30,000 rpm oil.
DUL marks a duplex set of two bearings, universally ground, supplied matched. Unit Quantity: 2 Pcs.
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