NSK7220CTRDULP4YSuper-Precision Angular Contact Ball Bearings – 100 mm ID, 180 mm OD, 34 mm Width, 15° Contact Angle, Open, Light Preload, P4Y, 2 Pcs

Product Description

What this part is

NSK 7220CTRDULP4Y super-precision angular contact ball bearings. Bore: 100 mm. Outside diameter: 180 mm. Width: 34 mm each. Series: 72. Open on both faces, straight bore, phenolic outer-ring-guided cage. Supplied as a universally matchable duplex pair at light preload.

Decoding the designation

7220: series 72, bore code 20, 100 mm bore. C: 15° contact angle. TR: phenolic cage guided on the outer ring, rated to 120 °C. DUL: universally matchable duplex pair at light preload. P4Y: ISO class 4 with additional control of ring diameters, so tighter than plain P4.

What these specs mean in practice

Basic dynamic load rating: 188 kN per bearing. Basic static load rating: 127 kN per bearing. Permissible axial load: 88.5 kN. Limiting speed: 8,300 rpm on grease, 12,500 rpm on oil or oil-air. A 15° contact angle favours speed and radial stiffness, and an outer-ring-guided phenolic cage runs quiet and stays stable at high dmn, which is what lets this execution reach those speeds. Operating temperature range: -30 to +120 °C, set by the cage.

Quantity and configuration

Two pieces, 2 Pcs. Universally matchable, so the pair mounts back-to-back, face-to-face or in tandem without a spacer and the light preload comes out as ground.

Fitting notes

Straight bore, open on both faces. Bearings arrive preserved. The inner rings clamp between a shaft shoulder and a locknut, the outer rings seat square in the housing bore and are clamped by the cover. Mass: 3.18 kg per bearing.

Interchange guidance

SKF 7220 CDGA/P4A and FAG B7220-C-T-P4S-DUL are the same 100 x 180 x 34 mm size at 15° with light preload. NSK 7220A5TRDULP4Y is a related size at a 25° contact angle. Searchable forms: 7220CTRDULP4Y, 7220 CTR/DUL P4Y, 7220-CTR-DUL-P4Y, 7220C.