SKF7021-ACDGA/P4ASuper Precision Angular Contact Ball Bearing – Straight Bore, 105 mm ID, 160 mm OD, 26 mm Width, Open, 25° Contact Angle, Light Preload

Product Description

What this part is

SKF 7021-ACDGA/P4A single-row super-precision angular contact ball bearing. Series: 70, extra light section. Bore: 105 mm. Outside Diameter: 160 mm. Width: 26 mm. Open on both faces, machined fabric-reinforced phenolic resin cage, steel balls on steel raceways. Searchable forms of the designation: 7021 ACDGA/P4A, 7021ACDGA/P4A, 7021-ACD-P4A-DGA, 7021ACDGAP4A.

Decoding the designation

Contact Angle: 25°. Precision Class: P4A — ABEC 7 dimensional tolerance with running accuracy held to ABEC 9. Preload: light. Cage: machined phenolic resin, rated for continuous service to 120°C.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope, which suits spindles that see combined radial and axial load. Dynamic Load Rating: 90.4 kN. Static Load Rating: 93.0 kN. Fatigue Load Rating: 3.4 kN. Limiting speed: 7 500 r/min on grease, 12 000 r/min on oil. Light preload holds shaft position and running accuracy while keeping heat generation low.

Quantity and configuration

One bearing. Unit Quantity: 1 Pc. Open bearing, no seals or shields, lubricated on installation with oil or grease.

Fitting notes

The phenolic cage sets the temperature ceiling at 120°C. Oil lubrication is required to reach the higher limiting speed. Preloaded bearings run without internal clearance, so shaft and housing fits are held to super-precision tolerances.

Interchange guidance

Same-specification equivalents: FAG B7021-E-T-P4S-UL and NSK 7021A5TYNSULP4. Fafnir 3MM9121WI CR SUL covers the same envelope and contact angle. SKF 7021 CDGA/P4A is a related size at a 15° contact angle.