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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
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FAG B7022E.TPA.P4.UM super-precision spindle bearing, 110 mm bore, 170 mm OD, 28 mm wide, 25° contact angle, phenolic cage, P4 class, medium preload.
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| MFR / Brand | FAG |
|---|---|
| MPN | B7022E.TPA.P4.UM |
| Model | B7022ETPAP4UM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 110 mm |
| OD | 170 mm |
| Width | 28 mm |
| Material | Bearing Steel |
|---|---|
| Series | B7000 |
| Base Number | B7022E |
| Industry Terms | spindle bearing; super precision angular contact; phenolic cage bearing; universal matching; medium preload; ABEC 7; B7022; high speed spindle bearing |
| Application Types | Milling and boring spindles; machine-tool spindles requiring axial stiffness; high-speed precision rotating assemblies |
| Bore Shaft Size | 110 mm |
| Mpn Variants | B7022E.TPA.P4.UM; B7022E-TPA-P4-UM; B7022ETPAP4UM; B7022E.T.P4S.UM; B7022E TPA P4 UM; B7022E; B-7022-E-TPA-P4-UM |
| Manufacturer Status | FAG is a Schaeffler brand; the B7022E spindle bearing remains an active designation |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25° |
| Part Number | B7022E.TPA.P4.UM |
| Cross Reference 1 | RHP 7022ETSUMP4 – 25°, phenolic cage, medium preload |
|---|---|
| Cross Reference 2 | GMN S6022 E TA P4 D UM – 25°, phenolic cage |
| Cross Reference 3 | Fafnir 3MM9122 UM – 25°, medium preload |
| Cross Reference 4 | NSK 7022A5TYSUMP4 – 25°, polyamide cage vs phenolic |
| Cross Reference 5 | NSK 7022C – 15° vs 25° |
A FAG B-series super-precision angular contact spindle bearing in the 7022 envelope. Brand: FAG. Manufacturer: FAG (Schaeffler). Designation: B7022E.TPA.P4.UM. ISO Base Number: 7022. Bore: 110 mm. Outside Diameter: 170 mm. Width: 28 mm. Contact Angle: 25°. Bearing Type: open angular contact spindle bearing. Cage Material: fabric-reinforced phenolic. Precision Class: P4 (ABEC 7). Preload: medium. Matching: universal. Condition: New. Set Composition: 1 Pc.
B: FAG high-speed spindle bearing series, with a reduced ball complement and spindle-specific internal geometry. 7022: ISO 70 dimension series, bore code 22, giving the 110 x 170 x 28 mm envelope. E: 25° contact angle in the FAG spindle-bearing scheme. TPA: fabric-reinforced phenolic cage. P4: ISO precision class 4, equivalent to ABEC 7. UM: universal matching at medium preload, valid in back-to-back, face-to-face or tandem arrangement.
A 25° contact angle carries more thrust per unit of radial load than a 15° bearing and holds axial position better under interrupted cutting, with a lower speed ceiling and more heat at a given rpm. It is the usual specification for milling and boring spindles, while 15° is the usual specification for grinding.
A phenolic cage is self-lubricating, absorbs oil and is gentler on the balls than pressed steel during momentary oil starvation, which is why it is standard on high-speed spindle bearings. It also caps the operating temperature of the bearing.
Medium preload sits between light preload (fastest, least stiff) and heavy preload (stiffest, hottest), and is the common default for general machine-tool spindle work. Universal matching means any two bearings of this designation clamp together to give the correct preload.
Related 7022-envelope designations and their contact angles: NSK 7022C at 15°; Fafnir 3MM9122 at 25°. Contact-angle letters vary by maker: FAG C = 15° and E = 25°; NSK C = 15°, A5 = 25°, A = 30°; SKF AC = 25°. B-series internal geometry differs from a general-purpose 7022, so speed capability and stiffness differ at the same nominal angle and precision class.
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