SKF71924ACDP4ADGASuper-Precision Angular Contact Ball Bearing – Straight Bore, 120 mm ID, 165 mm OD, 22 mm Width, Open, 25° Contact Angle, Light Preload, ABEC 7 / P4.

Product Description

What this part is

SKF 71924 ACD/P4A DGA super-precision single row angular contact ball bearing. Bore: 120 mm. Outside diameter: 165 mm. Width: 22 mm. Series: 719, extra-light section. 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, 450 N axial preload, on a universally matchable bearing.

What these specs mean in practice

Basic dynamic load rating: 72.8 kN (16,370 lbf). Basic static load rating: 86.5 kN (19,450 lbf). Fatigue load limit: 3.05 kN. On the 719 extra-light section the static rating sits well above the dynamic rating, which is normal for this section. A 25° contact angle carries more thrust and less speed than a 15° angle of the same envelope. Attainable speed: 7,000 r/min on grease and 11,000 r/min on an oil-air feed. Ball complement: 28 balls at 14.288 mm diameter.

Preload and matching

Preload class GA, light: 450 N. Axial stiffness: 302 N/µm. Universally matchable construction lets bearings of this designation be combined directly into multi-bearing stacks with the preload arriving as built.

Quantity and configuration

One universally matchable bearing. Mass: 1.17 kg (2.58 lbs).

Fitting notes

Shaft abutment diameter: 126 mm minimum. Housing abutment diameter: 159 mm maximum, and 161 mm on the opposing face. Maximum shaft fillet radius: 1 mm. Maximum housing fillet radius: 0.6 mm. Reference grease quantity: 15.3 cm³. Calculation factor a: 44.4 mm. Preload is set at the factory and the bearing runs as supplied.

Interchange guidance

Same-envelope equivalents at 25°: FAG B71924-E-T-P4S-UL, Fafnir 3MM9324WI. The 15° 71924 CD/P4A shares the 120 x 165 x 22 mm envelope as a related size at a different contact angle, with a dynamic rating of 78.0 kN and a static rating of 91.5 kN. Searchable forms: 71924ACDP4ADGA, 71924-ACDGA/P4A, 71924 ACD P4A DGA, 71924A, 7924A, 7924E.