NSK7205AWDBP6Angular Contact Ball Bearing Matched Pair – 25 mm ID, 52 mm OD, 30 mm Total Width, Open, 30° Contact Angle, Back-to-Back

Product Description

What this part is

NSK 7205AWDBP6 matched angular contact ball bearing set. Series: 72. Bore: 25 mm. Outside diameter: 52 mm. Width per bearing: 15 mm. Total width of the pair, 2B: 30 mm. Contact angle: 30°. Arrangement: DB, back-to-back. Closure: open. Cage: pressed steel. Tolerance class: P6 (ABEC 3). Axial internal clearance: CN.

Decoding the designation

7205: 72-series angular contact ball bearing, 25 mm bore. A: 30° contact angle. W: universally matchable execution. DB: back-to-back arrangement. P6: ISO tolerance class 6, ABEC 3.

Load ratings and speed

Basic dynamic load rating Cr: 29,000 N (29.0 kN). Basic static load rating C0r: 20,500 N (20.5 kN). Limiting speed, grease lubrication: 9,500 rpm. Limiting speed, oil-bath lubrication: 13,000 rpm. Load centre spacing a0: 37.2 mm. Mass of the pair: 0.26 kg.

What these specs mean in practice

A 30° contact angle sits between the 15° high-speed executions and the 40° heavy-thrust ones: it carries substantially more axial load than a 15° bearing of the same envelope and runs faster than a 40°. Back-to-back mounting spreads the load centres 37.2 mm apart, which gives the pair a wide effective support base and high resistance to overturning moments on a short shaft. Axial clearance is set to CN rather than a preload, so the pair runs cooler and tolerates more thermal growth than a preloaded set.

Fitting notes

Shaft abutment diameter da: 31 mm minimum. Housing abutment diameter Db: 47 mm maximum. Chamfer dimensions r 1 mm minimum, r1 0.6 mm minimum. Permissible shaft or housing fillet radius ra: 1 mm maximum, rb: 0.6 mm maximum. The outer ring is thicker on the marked face than the unmarked face, which is what sets the contact angle, so the marked faces of a back-to-back pair go outward.

Quantity and configuration

Two bearings, a factory-matched back-to-back pair. Country of origin: Japan.

Interchange guidance

SKF 7205 B/P6 DB, FAG 7205-B-TVP-P6 and Fafnir 3MM205WI-CR share the 25 x 52 x 15 mm envelope at different contact angles — related sizes. Searchable forms: 7205AWDBP6, 7205 A W DB P6, 7205-A-W-DB-P6, 7205A, B7205E, 3MM205 WI CR.