FAGSuper-Precision Angular Contact Spindle Bearing – 40 mm ID, 68 mm OD, 15 mm Width, Open, 25°, Light Preload, ABEC 7

Product Description

What this part is

FAG B7008E.TPA.P4.UL super-precision angular contact spindle bearing. Bore: 40 mm. Outside diameter: 68 mm. Width: 15 mm. Series: B70. Base number: 7008. Single row, open, high carbon chrome steel rings and balls. The carton also carries the Fafnir designation 3MM9108WI CR SUL for the same bearing. Searchable forms include B7008E.TPA.P4.UL, B7008ETPAP4UL, B-7008-E-TPA-P4-UL, B 7008 E TPA P4 UL, 7008E and 3MM9108WICRSUL.

Decoding the designation

Contact Angle: 25°. The E position on a B70 designation is a contact angle, and the Fafnir 3MM prefix on the same carton gives 25° independently. Cage: machined fabric-base laminate phenolic window cage, from the TPA position, confirmed again by the Fafnir CR code. Precision Class: ISO P4 / ABEC 7. Matching and preload: universal with light preload, from the UL position.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope, and the large steel balls of the B70 execution combine high load capacity with high rigidity at medium to high speeds. Dynamic Load Rating: 21.6 kN (4,856 lbf). Static Load Rating: 18.3 kN (4,114 lbf). Limiting Speed: 24,000 rpm. Operating temperature: –30 to +120 °C. Mass: 0.42 lb. The phenolic cage is light, self-lubricating and quiet, and suits oil-mist and oil-air lubrication. ISO P4 tolerances give tighter running accuracy and lower running vibration than standard class.

Quantity and configuration

One bearing. Universal matching means any two pieces of this designation can be stacked back-to-back, face-to-face or in tandem, and the ground-in light preload is set simply by clamping the rings.

Fitting notes

Rings are clamped solid against the shaft shoulder and the housing shoulder. Because preload is ground into the ring faces, this bearing carries no radial internal clearance class. Lubricant: oil.

Interchange guidance

Same 25° angle and light preload: Fafnir 3MM9108WI-CR-SUL (the carton’s own Fafnir number), NSK 7008A5TRSULP4 and SKF 7008 ACD/P4ADGA. FAG’s own B7008-E-T-P4S-UL is the same bearing to a tighter P4S class. The B7008-C-T-P4S-UL is 15° rather than 25° and carries different thrust and speed figures. The B7008E.TPA.P4.UM has medium preload instead of light.