NSK7024CTYDUMP4Super Precision Angular Contact Ball Bearing Pair – Straight Bore, 120 mm ID, 180 mm OD, 28 mm Width, Open, 15° Contact Angle, Duplex Medium Preload, P4.

Product Description

What this part is

NSK 7024CTYDUMP4 super-precision angular contact ball bearing, supplied as a duplex pair. Bore: 120 mm. Outside diameter: 180 mm. Width: 28 mm per bearing. Contact angle: 15°. Precision class: P4, equivalent to ABEC 7. Open on both faces. Weight: 5.50 lb per bearing.

Decoding the designation

7024: 70 series, 120 mm bore. C: 15° contact angle. TY: ball-guided cage. DUM: duplex set, medium preload. P4: super-precision tolerance and running-accuracy class.

What these specs mean in practice

Dynamic load rating: 87.5 kN (19,670 lbf). Static load rating: 93 kN (20,900 lbf). Limiting speed: 6,300 rpm. Maximum operating temperature: 120 °C. A 15° contact angle runs faster and carries less thrust than a 25° execution on the same envelope. Medium preload sits between light and heavy: more axial and radial stiffness than light, and more heat generated at a given speed, which is the trade a stiffer spindle asks for.

Quantity and configuration

Two bearings, ground as a duplex medium-preload set. The ground faces establish the preload when the rings are clamped.

Fitting notes

Shaft seat to h5 and housing bore to H6 or closer hold the P4 running accuracy. Clamping is applied evenly across the ring faces so the ground offsets set the preload.

Interchange guidance

Same-specification 15° medium-preload executions: SKF 7024 CD/P4ADGB, Fafnir 2MM9124WI-DUM, FAG B7024-C-T-P4S-UM, GMN S6024CTA. Punctuation variants: 7024C TY DUM P4, 7024-CTY-DUM-P4, 7024CTYDUMP4.