SKF7208ACDP4ATBTASuper-Precision Angular Contact Ball Bearing – 40 mm Bore, 80 mm OD, 18 mm Width, 25°, ABEC 7

Product Description

What this part is

SKF 7208 ACD/P4A super-precision single-row angular contact ball bearing, universally matchable. Bore Diameter: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm. Contact Angle: 25°. 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: 7208.

Decoding the designation

7208 is the ISO 72 series at a 40 mm bore. ACD is SKF’s 25° super-precision design. GA — universally matchable, extra light preload. P4A is the super-precision tolerance class. Written as 7208-ACDGA/P4A, 7208-ACD-GA-P4A and 7208 ACD/P4ADGA.

What these specs mean in practice

Dynamic Load Rating: 31,900 N. Static Load Rating: 22,800 N. Limiting Speed: 16,000 rpm grease; 26,000 rpm oil-air. A 25° contact angle puts more of the load path into the axial direction than a 15° bearing, so it carries more thrust and gives higher axial stiffness at the cost of top speed. Extra light preload suits positions where speed and heat matter more than rigidity. Universally matchable rings mean any two of these bearings can be set back-to-back, face-to-face or in tandem and the preload comes out to the published class without shims or grinding.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing per sale unit, open on both faces. Ball complement: 14 balls of 11.112 mm diameter. Load-centre distance a: 23.1 mm from the side face.

Mounting data

Shaft abutment diameter da and db: 47 mm minimum. Housing abutment diameter Da: 73 mm maximum. Housing abutment diameter Db: 75.8 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: 56.2 mm. Reference grease quantity: 4.7 cm³ per bearing.

Interchange guidance

The 25° super-precision 7208 is built by every spindle-bearing maker and the angle codes translate. Cross-Reference 1: FAG B7208-E-T-P4S, where the E on a B70 designation is the 25° angle. Cross-Reference 2: NSK 7208A5, where A5 is 25°. Cross-Reference 3: RHP 7208 A5. Cross-Reference 4: SKF 7208 CD/P4A, the same envelope and precision at a 15° contact angle and therefore a related size rather than a substitution. Searchable forms: 7208-ACDGA/P4A, 7208-ACD-GA-P4A, 7208ACDGAP4A, 7208 ACD, 7208.