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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
Matched duplex pair of super-precision angular contact ball bearings, 45 mm bore x 75 mm OD x 16 mm width each, 15° contact angle, ABEC 7, light preload, polyamide cage. Sold as 2 pieces forming one set.
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$218.90
3 in stock
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| MFR / Brand | FAG |
|---|---|
| MPN | B7009C.TPA.P4.DUL |
| Model | B7009CTPAP4DUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 75 mm |
| Width | 16 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7000 |
| Base Number | 7009 C |
| Industry Terms | Spindle bearing pair, super precision angular contact, duplex matched set, ABEC 7 bearing, light preload set, 45mm bore spindle bearing |
| Common Misspellings | B7009C TPA P4 DUL, b7009ctpap4dul, B7009 CTPA P4DUL, FAG B7009CTPAP4-DUL, B7009C.TPA.P4.DUI |
| Application Types | Machine tool spindles, grinding spindles, milling heads, high-speed precision gearboxes, ball screw drive supports |
| Bore Shaft Size | 45 mm (1.7717 in) |
| Mpn Variants | B7009C.TPA.P4.DUL, B7009CTPAP4DUL, B-7009-C-TPA-P4-DUL, B7009C-TPA-P4-DUL, B7009C.T.P4S.DUL, 7009C, 7009 C |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing, 2 in the assembled set |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Part Number | B7009C.TPA.P4.DUL |
| Cross Reference 6 | SNFA E209 7CE1DUL |
|---|
A matched duplex set of two super-precision single-row angular contact ball bearings from the FAG B-series spindle range. Each bearing is 45 mm bore, 75 mm outside diameter, 16 mm width, giving 32 mm total width across the pair. The rings are ground as a set, producing a defined light preload when the pair is clamped together.
A 15° contact angle favours speed and radial stiffness over thrust capacity, which is the standard trade for a machine tool spindle. Light preload keeps ball contact defined with the least added friction and heat, giving the highest speed capability of the three standard preload grades.
The polyamide cage runs quietly, damps vibration and has a continuous service ceiling around 120 °C, above which the cage material governs the limit rather than the steel. P4 tolerances hold running accuracy tight enough for spindle work — radial and axial runout are held to a fraction of the P0 allowance.
Mounted as a duplex set the pair takes thrust in both directions and holds the preload the matched grinding established.
The marked ring faces go together in the orientation the factory grind was made for, clamped square against a rigid shoulder so the preload lands as designed. Clamping force passes through the rings, never through the balls. A universal-set bearing can also be arranged back-to-back, face-to-face or in tandem, and the arrangement chosen sets the resulting stiffness.
The ISO base number 7009 C describes a 45 x 75 x 16 mm 15° single-row angular contact bearing. Light-preload P4 duplex equivalents are SKF 7009 CD/P4ADGA, NSK 7009CTRDULP4 and Timken/Fafnir 2MM9109WI CR DUL. Same-envelope parts differing in preload grade (DUM medium, DUH heavy), tolerance class or contact angle are related sizes rather than interchanges.
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