SKF7220CDGAP4ASuper-Precision Angular Contact Ball Bearing – 100 mm ID, 180 mm OD, 34 mm Width, Open, 15° Contact Angle, Light Preload

Product Description

What this part is

SKF 7220 CD/P4A DGA single-row super-precision angular contact ball bearing, also written 7220 CDGA/P4A. Series: 72. Bore: 100 mm. Outside diameter: 180 mm. Width: 34 mm. Contact Angle: 15°. Open on both faces. Country of origin: Italy. GTIN: 7316570241792.

Decoding the designation

CD: high-capacity D design at a 15° contact angle. DGA: light preload, the first step on SKF’s preload ladder for universally matchable bearings. Precision Class: P4A — dimensional accuracy to ISO tolerance class 4 with running accuracy better than class 4, equivalent to ABEC 7.

What these specs mean in practice

The 15° contact angle gives high radial stiffness and high speed capability, and takes thrust in one direction. Light preload sets the bearings in defined contact for accurate shaft location while holding frictional heat down, which is what keeps the speed capability available in a closed spindle. The 72 series section is heavier than a 70 series of the same bore, giving more load capacity for the same shaft diameter.

Quantity and configuration

Universally matchable execution. Bearings of this designation combine back-to-back, face-to-face or in tandem without shims or grinding, and the preload of the finished arrangement follows from the DGA class.

Fitting notes

Straight bore on a cylindrical shaft seat. Preloaded execution, so Internal Clearance reads N/A. Cage: machined, phenolic. Lubricant: oil.

Interchange guidance

Base number: 7220. FAG equivalent: B7220-C-T-P4S-DUL. NSK equivalent: 7220CTYNDULP4. SKF 7220 CDGB/P4A and 7220 CDGC/P4A carry medium and heavy preload on the same 100 x 180 x 34 mm envelope, and 7220 ACDGA/P4A carries a 25° contact angle — each a related size rather than a direct substitution.