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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
Availability:
3 in stock
Super precision angular contact ball bearing, 40 x 68 x 15 mm, 25° contact angle, open, ABEC 7 phenolic cage, universally matchable medium preload.
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$90.37
3 in stock
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| MFR / Brand | FAG |
|---|---|
| MPN | B7008E.TPA.P4.UM |
| Model | B7008ETPAP4UM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 40 mm |
| OD | 68 mm |
| Width | 15 mm |
| Material | Chrome Steel |
|---|---|
| Base Number | B7008E |
| Industry Terms | spindle bearing; machine tool bearing; super precision angular contact; P4 spindle bearing; phenolic cage bearing |
| Common Misspellings | B7008E TPA P4 UM; B7008ETPAP4-UM; FAG B7008 E TPA; B7008ETPA P4UM |
| Application Types | Machine tool spindles; grinding spindles; high-speed motorised spindles; precision rotary tables |
| Bore Shaft Size | 40 mm |
| Mpn Variants | B7008ETPAP4UM; B-7008-E-TPA-P4-UM; B7008E.TPA.P4.UM; B7008 E TPA P4 UM; 7008E |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Part Number | B7008E.TPA.P4.UM |
| Cross Reference 1 | Timken Fafnir 3MM9108WI CR SUM |
|---|---|
| Cross Reference 2 | SKF 7008 ACDGC/P4A - medium preload |
| Cross Reference 3 | FAG B7008C.TPA.P4.UM - 15 deg contact angle |
A FAG B7008E.TPA.P4.UM super precision angular contact ball bearing, 40 mm bore, 68 mm outside diameter, 15 mm width. Single row, open on both faces, 25° contact angle, fabric-base laminate phenolic cage, ABEC 7 precision, ground for universal matching at medium preload.
B7 is the Schaeffler spindle bearing series. The 008 identifies the 40 mm bore in the 70 dimension series. E denotes the 25° contact angle in the FAG spindle scheme. TPA is a fabric-base laminate phenolic cage, not a polyamide cage. P4 is ISO class 4, equivalent to ABEC 7. UM marks a universally ground bearing at medium preload, so any two or three units of the same designation form a matched set in back-to-back, face-to-face or tandem arrangement.
A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope, which suits fixed spindle positions and heavier axial cutting loads. The phenolic cage is light, runs on the outer land, and absorbs oil, which is why this construction is standard on oil-mist and oil-air lubricated machine tool spindles. Medium preload sits between the light preload used for maximum speed and the heavy preload used for maximum stiffness.
1 Pc. Single bearing, universally ground, open both faces.
Universal grinding means the offset is built into the rings, so no spacer grinding is required to build a set. Mounting is by interference on the inner ring against a shaft shoulder, with the outer ring located in the housing bore by an end cap or spring pack according to the arrangement chosen.
Timken Fafnir 3MM9108WI CR SUM and SKF 7008 ACDGC/P4A are the same-spec 25° ABEC 7 medium-preload alternatives. The FAG B7008C.TPA.P4.UM is a related size on the same envelope with a 15° contact angle, a different thrust and speed balance.
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