FAGB7028ETPAP4ULSuper Precision Angular Contact Spindle Bearing – 140 mm ID, 210 mm OD, 33 mm Width, Open, 25° Contact Angle, Light Preload, P4S

Product Description

What this part is

FAG B7028E.TPA.P4.UL super-precision angular contact spindle bearing. Series: B70. Bore: 140 mm. Outside Diameter: 210 mm. Width: 33 mm. Single row, open, universally matchable for pair and set mounting. Country of origin: Germany.

Decoding the designation

B70 is the spindle bearing series. E sets the Contact Angle at 25°. TPA and T both denote a machined fabric-base laminate phenolic cage. P4S is the tolerance class, held tighter than P4 to ISO 492. U marks a universally ground single bearing and L sets light preload at 1,336 N.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15°. Against the 15° B7028-C on the same envelope, this execution roughly doubles axial rigidity, at 339 N per micrometre on light preload against 142. Dynamic Load Rating: 145 kN. Static Load Rating: 108 kN. Fatigue Load Limit: 8.6 kN. Limiting speed: 5,600 rpm on grease, 9,000 rpm on oil. The phenolic cage is light and self-lubricating, keeping ball guidance steady where a brass cage would add mass.

Quantity and configuration

One bearing per unit. The UL execution is universally ground, so it runs alone or pairs with another UL piece back-to-back, face-to-face or in tandem, with light preload set by the ground faces.

Fitting notes

Shaft shoulder diameter: 152 mm to h12. Housing shoulder diameter: 199 mm to H12. Maximum recess radius: 2 mm. Minimum chamfer dimension: 2 mm. Distance between the pressure cone apexes: 57.3 mm. Grease injection pitch diameter: 161.6 mm to 169.2 mm. Operating temperature range: -30 °C to 100 °C.

Interchange guidance

Schaeffler’s current designation is B7028-E-T-P4S-UL, which replaces both B7028E.T.P4S.UL and B7028E.TPA.P4.UL. Related sizes on the same envelope: B7028-C-T-P4S-UL at 15°, and B7028-E-2RSD-T-P4S-UL with non-contact seals both sides.