SKF7015ACDP4ATBTBSuper Precision Angular Contact Ball Bearing Set – Straight Bore, 75 mm ID, 115 mm OD, 20 mm Width per Bearing, 60 mm Total, Open, 25° Contact Angle, Tandem Back-to-Back, Medium Preload, 3 Pcs

Product Description

What this part is

SKF 7015 ACD/P4A TBTB super-precision angular contact ball bearing set. Series: 70. Base number: 7015. Bore: 75 mm. Outside diameter: 115 mm. Width: 20 mm per bearing, 60 mm across the set. Single row per bearing, straight bore, open on both faces. Searchable variants of the designation: 7015ACD/P4ATBTB, 7015 ACD P4A TBTB, 7015ACDP4ATBTB, 7015-ACD-P4A-TBTB.

Decoding the designation

Contact Angle: 25°. Design: ACD high-capacity super-precision execution. Precision Class: P4A, equivalent to ABEC 7. Set code TBTB: T = three bearings, arranged tandem against back-to-back, medium preload. Cage: machined, fabric-reinforced phenolic.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15°. The tandem pair shares one direction of thrust between two bearings, and the third bearing opposes it, so the set takes a heavy load in the tandem direction and locates the shaft in both. Medium preload raises stiffness and axial location accuracy over the light class. Basic dynamic load rating: 108 kN. Basic static load rating: 140 kN. Limiting speed: 9500 rpm.

Quantity and configuration

Three bearings. Unit Quantity: 3 Pcs. Mounting arrangement: tandem against back-to-back. Internal Clearance: N/A — the set is preload-set, not clearance-set.

Fitting notes

Ring faces are ground so that clamping the stack solid produces the specified medium preload. The two tandem bearings face the same way and the third opposes them, so stack orientation is fixed by the ground faces. Operating range: -30 °C to 100 °C.

Interchange guidance

Same-envelope equivalents: FAG B7015-E-T-P4S, Fafnir 3MM9115WI. Related size: 7015 CD/P4A carries a 15° contact angle and a different thrust capacity.