NSKSuper-Precision Angular Contact Ball Bearings – 100 mm ID, 150 mm OD, 24 mm Width, 15° Contact Angle, Open, Back-to-Back Pair, ABEC 7

Product Description

What this part is

NSK 7020CTDBP8PA7 super-precision angular contact ball bearings. Bore: 100 mm. Outside diameter: 150 mm. Width: 24 mm each. Series: 70. Open on both faces, straight bore, phenolic outer-ring-land-riding cage. Supplied as a back-to-back matched pair. The carton also carries the Fafnir designation 2MM9120WI CR and the class marking ABEC7.

Decoding the designation

7020: series 70, bore code 20, 100 mm bore. C: 15° contact angle. T: phenolic cage guided on the outer ring. DB: back-to-back duplex pair. PA7: accuracy class equivalent to ABEC 7 / P4. The Fafnir cross reads the same way – 2MM = 15°, 9120 is the 7020 envelope, CR = phenolic outer-ring-land-riding cage.

What these specs mean in practice

Basic dynamic load rating: 95.0 kN per bearing. Basic static load rating: 77.0 kN per bearing. Permissible axial load: 49.0 kN. Effective load centre: 28.7 mm. Limiting speed: 9,200 rpm on grease, 14,000 rpm on oil or oil-air. A back-to-back pair sets its contact lines diverging outward, so the shaft resists tilting moments across a support span wider than the bearing stack. A 15° contact angle keeps that stiffness available at speed.

Quantity and configuration

Two pieces, 2 Pcs, a factory back-to-back matched pair. Total stack width 48 mm.

Fitting notes

Straight bore, open on both faces. The pair mounts in the orientation marked on the ring faces. Inner rings clamp between a shaft shoulder and a locknut; outer rings seat square in the housing bore and are clamped by the cover. Mass: 1.27 kg per bearing.

Interchange guidance

SKF 7020 CD/P4A and FAG B7020-C-T-P4S are the same 100 x 150 x 24 mm size at 15°. Timken/Fafnir 2MM9120WI CR is the Fafnir designation for the same size, angle and cage. NSK 7020A5TRDULP4Y is a related size at a 25° contact angle. Searchable forms: 7020CTDBP8PA7, 7020 C T DB P8 PA7, 7020-C-T-DB-P8-PA7, 7020C.