SNR7208CG1DUJ84Angular Contact Ball Bearing – Straight Bore, 40 mm ID, 80 mm OD, 18 mm Width, Open, 15° Contact Angle, Medium Preload.

Product Description

What this part is

NTN-SNR 7208CG1DUJ84 super-precision angular contact ball bearing, ISO 7200 light series, 40 x 80 x 18 mm. Bore: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm. Contact Angle: 15°. Number of Rows: 1. Rolling Elements: Ball. Bearing Material: Bearing steel. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic (laminated resin). Cage Type: Machined, outer-ring centred. Precision Class: ISO Class 4 (ABEC 7 / P4). Preload: Medium. Series: 7200. Unit Quantity: 2 Pcs.

Decoding the designation

7208 — ISO 7200 light series angular contact ball bearing on a 40 mm bore. C — Contact Angle: 15°. G1 — Cage Material: Phenolic (laminated resin), machined and centred on the outer ring. J84 — Preload: Medium, at Precision Class: ISO Class 4 (ABEC 7 / P4). Searchable forms of the number: 7208CG1DUJ84, 7208 C G1 DU J84, 7208-C-G1-DU-J84, 7208CDUJ84, 7208 C DU J84.

What these specs mean in practice

A 15° contact angle favours speed and radial capacity; a 25° bearing on the same 40 x 80 x 18 mm envelope carries more thrust and less speed. Precision Class: ISO Class 4 (ABEC 7 / P4) gives tighter bore, outer-ring and runout tolerances than a standard-class bearing, which holds a spindle centred and lowers running vibration. Cage Material: Phenolic (laminated resin) is light, low-inertia and retains oil in its fabric base. Cage Type: Machined, outer-ring centred — the cage rides on the outer-ring land, which keeps it stable at high rotational speed. Preload: Medium sits one step above light on the SNR preload ladder: it raises axial and radial stiffness and tightens shaft location under load, and it runs warmer than a light-preload set at the same speed. Internal fit is defined by preload rather than by a running clearance class, which is how every preloaded pair is specified.

Quantity and configuration

Unit Quantity: 2 Pcs — a matched pair, supplied as bare bearings. The faces are universally ground, so the pair can be clamped back-to-back, face-to-face or in tandem and reaches its rated medium preload in any of the three. Mounting Arrangement: Universal (DB, DF or DT).

Interchange guidance

Carton cross-references: FAG B7208-C-T-P4S-DUM, NSK 7208CTYNDUMP4, Fafnir 2MM208WI CR DUM, SKF 7208 CD/P4ADGB. Each is a 40 x 80 x 18 mm 15° universally matchable medium-preload pair in ABEC 7, so each is a direct substitution. A 7208 at 25°, or one at light or heavy preload, shares the same envelope but changes the axial stiffness and speed of the spindle, and is a related size rather than an equivalent.