NSK7904A5TRDULP4YSuper Precision Angular Contact Ball Bearing Matched Set 20x37x9 mm, 25 Degree Contact Angle, ABEC 7, Duplex Light Preload, Phenolic Cage, Extra Thin 79 Series

Product Description

What this part is:

NSK 7904A5TRDULP4Y super-precision angular contact ball bearing, matched DUL pair (2 Pcs), ISO 79 extra thin series, 20 mm bore, 37 mm outside diameter, 9 mm width per bearing. 25° contact angle, light preload, P4 tolerance class, phenolic cage. The carton number 71904 is the same envelope. Country of origin: United Kingdom.

Decoding the designation:

7904 — ISO 79 extra thin series, 20 x 37 x 9 mm; also written 71904.

A5 — NSK contact angle code, 25°.

TR — outer-ring guided phenolic cage.

DU — duplex, universally ground.

L — light preload.

P4 — ABEC 7 tolerance class.

Specifications:

Bore Diameter: 20 mm. Outside Diameter: 37 mm. Overall Width: 9 mm per bearing. Contact Angle: 25°. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Precision Class: ABEC 7 / P4. Preload: light (L). Mounting Arrangement: universally matchable duplex. Cage Material: Phenolic. Closure Type: Open. Series: ISO 79. Unit Quantity: 2 Pcs.

Dimensions and mounting:

Envelope per bearing: 20 x 37 x 9 mm. The pair is ground together as a matched DUL set; the light preload comes from the ground ring offsets when both rings are clamped.

Compatibility and replacement:

Cross-references: Fafnir 3MM9304WICRDUL, SKF 71904 ACD/P4A, FAG B71904-E-T-P4S, all 25° on the 20 x 37 x 9 mm envelope. Searchable forms include 7904A5TRDULP4, 7904 A5 TR DUL P4Y and 71904A5TRDULP4Y.

Frequently asked questions:

What are the dimensions of the NSK 7904A5TRDULP4Y?

20 mm bore, 37 mm outside diameter, 9 mm width per bearing.

What contact angle and preload does it have?

25° contact angle (A5) with light preload (L), duplex universally ground (DU).

Is 71904 the same bearing envelope?

Yes. 7904 and 71904 are two ways of writing the same 20 x 37 x 9 mm ISO 79 series size.