SKF7216ACDP4ADGASuper-Precision Angular Contact Ball Bearing, Matched Pair – Straight Bore, 80 mm ID, 140 mm OD, 26 mm Width Each / 52 mm Pair, Open, 25° Contact Angle, Light Preload, ABEC 7 / P4.

Product Description

What this part is

SKF 7216 ACD/P4A DGA super-precision single row angular contact ball bearings, supplied as a matched pair. Bore: 80 mm. Outside diameter: 140 mm. Width: 26 mm per bearing, 52 mm across the pair. Series: 72. Open on both faces, straight bore, chrome steel rings and balls.

Decoding the designation

AC: 25° contact angle. D: window-type cage centred on the outer ring, in fabric-reinforced phenolic resin. P4A: SKF super-precision tolerance class, ABEC 7 dimensional accuracy with running accuracy held tighter still. DGA: light preload class, 520 N axial preload, on universally matchable bearings.

What these specs mean in practice

Per bearing, basic dynamic load rating: 81.9 kN (18,410 lbf). Basic static load rating: 72.0 kN (16,190 lbf). Fatigue load limit: 2.9 kN. The 72 series is a heavier section than the 70 series on the same bore, so it carries more load at a lower speed ceiling. A 25° contact angle carries more thrust and less speed than a 15° angle of the same envelope. Attainable speed: 8,500 r/min on grease and 14,000 r/min on an oil-air feed. Ball complement: 17 balls at 17.462 mm diameter.

Preload and matching

Preload class GA, light: 520 N. Axial stiffness: 257 N/µm. Universally matchable construction means the two bearings seat directly against one another and reach their rated preload as built.

Quantity and configuration

Two universally matchable bearings, 52 mm total stack width. Mass: 2.92 kg (6.44 lbs) for the pair.

Fitting notes

Shaft abutment diameter: 91 mm minimum. Housing abutment diameter: 129 mm maximum, and 134.4 mm on the opposing face. Maximum shaft fillet radius: 2 mm. Maximum housing fillet radius: 1 mm. Reference grease quantity: 18.1 cm³ per bearing. Preload is set at the factory and the pair runs as supplied.

Interchange guidance

Same-envelope equivalents at 25°: NSK 7216A5TRDULP4, FAG B7216-E-T-P4S-DUL. The 15° 7216 CD/P4A shares the 80 x 140 x 26 mm envelope as a related size at a different contact angle. Searchable forms: 7216ACDP4ADGA, 7216-ACD/P4ADGA, 7216 ACD/P4A DGA, 7216 ACDGA/P4A.