SKF7008ACDP4ADGASuper-Precision Angular Contact Ball Bearing – 40 mm Bore, 68 mm OD, 15 mm Width, 25°, ABEC 7

Product Description

What this part is

SKF 7008 ACD/P4A super-precision single-row angular contact ball bearing, universally matchable. Bore Diameter: 40 mm. Outside Diameter: 68 mm. Overall Width: 15 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. Item Weight: 0.19 kg (0.42 lb). Series: 70. Base Number: 7008. GTIN: 7316577087577.

Decoding the designation

7008 is the ISO 70 light 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 7008-ACDGA/P4A, 7008-ACD-GA-P4A and 7008 ACD/P4A.

What these specs mean in practice

Dynamic Load Rating: 15,900 N. Static Load Rating: 10,400 N. Limiting Speed: 19,000 rpm grease; 30,000 rpm oil-air. Eighteen small 7.938 mm balls in a 70-series light section is a high-count, low-mass rolling set, and that is what puts the oil-air speed at 30,000 rpm on a 40 mm shaft. A 25° contact angle carries more thrust and gives more axial stiffness than a 15° bearing of the same size. Extra light preload suits positions where speed and thermal behaviour matter more than rigidity.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing per sale unit, open on both faces. Ball complement: 18 balls of 7.938 mm diameter. Load-centre distance a: 20.2 mm from the side face.

Mounting data

Shaft abutment diameter da and db: 44.6 mm minimum. Housing abutment diameter Da: 63.4 mm maximum. Housing abutment diameter Db: 66 mm maximum. Shaft fillet radius ra: 1 mm maximum. Housing fillet radius rb: 0.3 mm maximum. Bearing chamfers r1,2: 1 mm minimum and r3,4: 0.3 mm minimum. Oil nozzle position dn: 50.8 mm. Reference grease quantity: 2.4 cm³ per bearing.

Interchange guidance

The 25° super-precision 7008 is built by every spindle-bearing maker and the angle codes translate. Cross-Reference 1: FAG B7008-E-T-P4S, where the E on a B70 designation is the 25° angle. Cross-Reference 2: NSK 7008A5, where A5 is 25°. Cross-Reference 3: RHP 7008 A5. Cross-Reference 4: SNFA EX40 7CE3, where CE3 is 25°. Cross-Reference 5: SKF 7008 CD/P4A, the same envelope and precision at a 15° contact angle and therefore a related size rather than a substitution. Searchable forms: 7008-ACDGA/P4A, 7008-ACD-GA-P4A, 7008ACDGAP4A, 7008 ACD, 7008.