SKF71924 CD/P4ASuper-Precision Angular Contact Ball Bearing – Straight Bore, 120 mm ID, 165 mm OD, 22 mm Width, Open, 15° Contact Angle, ABEC 7 / P4.

Product Description

What this part is:

SKF 71924 CD/P4A 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:

C: 15° 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.

What these specs mean in practice:

Basic dynamic load rating: 78.0 kN (17,540 lbf). Basic static load rating: 91.5 kN (20,570 lbf). Fatigue load limit: 3.25 kN. On the 719 extra-light section the static rating sits well above the dynamic rating, which is normal for this section. A 15° contact angle runs faster and takes less thrust than a 25° angle of the same envelope, which suits high-speed spindle positions. Attainable speed: 7,500 r/min on grease and 12,000 r/min on an oil-air feed. Ball complement: 28 balls at 14.288 mm diameter.

Quantity and configuration:

One bearing. Mass: 1.15 kg (2.54 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: 30.2 mm. Calculation factor f0: 16.

Cross-references:

Cross-references at 15°: FAG B71924-C-T-P4S, Fafnir 2MM9324WI. The 25° 71924 ACD/P4A shares the 120 x 165 x 22 mm envelope as a related size at a different contact angle, with a dynamic rating of 72.8 kN and a static rating of 86.5 kN. Searchable forms: 71924CDP4A, 71924-CD/P4A, 71924 CD P4A, 7924C, 7924-C.