SKF7210CDP4DGASuper-Precision Angular Contact Ball Bearing – 50 mm Bore, 90 mm OD, 20 mm Width, 15°, ABEC 7

Product Description

What this part is

SKF 7210 CD/P4A super-precision single-row angular contact ball bearing, universally matchable. Bore Diameter: 50 mm. Outside Diameter: 90 mm. Overall Width: 20 mm. Contact Angle: 15°. Precision Class: ABEC 7 / P4A. Preload: extra light (GA). Internal Clearance: N/A. Number Of Rows: 1. Rolling Elements: Ball. Bore Type: Cylindrical. Closure Type: Open. Bearing Material: Bearing steel. Series: 72. Base Number: 7210.

Decoding the designation

7210 is the ISO 72 series at a 50 mm bore. CD is SKF’s 15° super-precision design. GA — universally matchable, extra light preload. P4A is the super-precision tolerance class. Written as 7210-CDGA/P4, 7210-CD-P4-DGA and 7210C.

What these specs mean in practice

Dynamic Load Rating: 44,900 N. Static Load Rating: 34,000 N. Limiting Speed: 16,000 rpm grease; 26,000 rpm oil-air. A 15° contact angle keeps more of the load path radial, which is what buys the speed — 26,000 rpm on a 50 mm shaft under oil-air. Extra light preload suits positions where thermal growth and top speed matter more than rigidity. Universally matchable rings let any two of these be set back-to-back, face-to-face or in tandem and still reach the published preload without shims.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing per sale unit, open on both faces. Ball complement: 15 balls of 12.7 mm diameter. Load-centre distance a: 19.4 mm from the side face.

Mounting data

Shaft abutment diameter da and db: 57 mm minimum. Housing abutment diameter Da: 83 mm maximum. Housing abutment diameter Db: 85.8 mm maximum. Shaft fillet radius ra: 1 mm maximum. Housing fillet radius rb: 0.6 mm maximum. Bearing chamfers r1,2: 1.1 mm minimum and r3,4: 0.6 mm minimum. Oil nozzle position dn: 65.6 mm. Reference grease quantity: 6.7 cm³ per bearing.

Interchange guidance

The 15° super-precision 7210 is built by every spindle-bearing maker and the angle codes translate. Cross-Reference 1: FAG B7210-C-T-P4S, where the C on a B70 designation is the 15° angle. Cross-Reference 2: NSK 7210C, where C is 15°. Cross-Reference 3: RHP 7210 CT. Cross-Reference 4: SKF 7210 ACD/P4A, the same envelope and precision at a 25° contact angle and therefore a related size rather than a substitution. Searchable forms: 7210-CDGA/P4, 7210-CD-P4-DGA, 7210CDGAP4, 7210C, 7210.