SKF7204 ACD/P4A DGASuper-Precision Angular Contact Ball Bearing, Matched Pair – Straight Bore, 20 mm ID, 47 mm OD, 14 mm Width, Open, 25° Contact Angle, Extra Light Preload

Product Description

What this part is:

An SKF 7204 ACD/P4A DGA super-precision angular contact ball bearing set. Bore 20 mm, outside diameter 47 mm, width 14 mm per bearing, 28 mm across the pair. Open on both faces, one row of balls per bearing, phenolic cage. Supplied as a factory-matched pair of two bearings.

Decoding the designation:

7204 is the ISO 72 dimension series on a 20 mm bore. ACD sets a 25° contact angle, where the plain CD form of the same envelope is 15°. P4A is SKF’s super-precision accuracy class, equivalent to ABEC 7. DGA marks a universally matchable set of two bearings, extra light preload; SKF writes the same bearing supplied singly as 7204 ACDGA/P4A.

What these specs mean in practice:

The 25° contact angle trades speed for axial load capacity and axial stiffness against the 15° CD variant. Basic dynamic load rating is 16.6 kN and basic static load rating 8.0 kN per bearing, with a 34 000 r/min limiting speed. The fabric-base laminate phenolic cage is light and self-lubricating, which is what supports that speed.

Preload and clearance:

Universally matchable rings are ground with offset faces, so clamping them together sets a defined extra light preload. Preload takes the place of running clearance, and a radial internal clearance class therefore does not apply.

Quantity and configuration:

Two bearings, one matched set. Universal matching means the pair mounts back-to-back, face-to-face or in tandem, and further bearings of the same designation stack into the same arrangement.

Interchange guidance:

Cross-references at 25° contact angle with light preload: FAG B7204-E-T-P4S-DUL, NSK 7204A5TYNDULP4 and Fafnir 3MM204WI-DUL. SKF 7204 CD/P4ADGA has the same 20 x 47 x 14 mm size at a 15° contact angle.