SNR7220CDUJ74Super-Precision Angular Contact Ball Bearing 100 x 180 x 34 mm, 15° Contact Angle, Light Preload, Duplex Ground, Single Piece

Product Description

What this part is

A single super-precision angular contact ball bearing, 100 mm bore, 180 mm outside diameter, 34 mm width, with a 15° contact angle and duplex grinding for light preload.

Decoding the designation

7220 — angular contact ball bearing, 72 series, bore code 20 = 100 mmC — 15° contact angleDU — duplex ground, faces prepared for matched mountingJ74 — light preload in the SNR super-precision preload range–1/2PR — half a pair, one bearing

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; a 25° angle in the same envelope carries more thrust and runs slower. Duplex grinding sets the ring face offset so that two bearings clamped together produce a defined preload without shimming.

The J74 code sets that preload at the light grade, which gives the lowest heat generation and the highest speed of the SNR super-precision preload steps, with less axial rigidity than the medium J84 grade.

The J74/J84 preload codes belong to the super-precision preload family and are separate from the SNR J20/J30/J40/J50 radial clearance codes used on standard bearings.

Quantity and configuration

One bearing, half of a duplex pair. Ratings and stiffness figures for a mounted pair do not apply to a single half. Open both faces, no seals or shields.

Fitting notes

The bearing is mounted with its face marking oriented for the intended arrangement and clamped against square ground abutment faces. Pairing is done with a second bearing of the same designation and preload code so the ground offsets match.

Interchange guidance

Same-spec single equivalents: FAG B7220-C-T-P4S-UL, SKF 7220 CD/P4A, NSK 7220CTRSULP4, RHP 7220CTSULP4. The J84 medium-preload version and any 25° variant share the 100 × 180 × 34 mm envelope with different internal geometry and are related sizes.