SNR7008HDUJ84Angular Contact Ball Bearing – Straight Bore, 40 mm ID, 68 mm OD, 15 mm Width, Open, 25° Contact Angle, Medium Preload.

Product Description

What this part is

SNR 7008HDUJ84 single-row angular contact ball bearing, supplied as a matched duplex pair. Brand: SNR. Manufacturer Part Number: 7008HDUJ84. Bore: 40 mm. Outside Diameter: 68 mm. Width: 15 mm per bearing. Series: 7000. Number of Rows: 1 per bearing. Rolling Elements: Ball. Bearing Material: bearing steel. Closure Type: open on both faces. Bore Type: straight. Item Weight: 0.42 lbs.

Decoding the designation

Contact Angle: 25°. Preload: medium. Precision Class: ABEC 7, equivalent to P4. Cage Material: phenolic. Cage Type: outer-ring land-riding. Mounting Arrangement: universally ground. Minimum Temperature: -40°C. Maximum Temperature: 120°C.

The carton carries this bearing in five schemes: SNR 7008 H DU J84, SKF 7008 ACD/P4ADGB, FAG 7008-E-T-DUM-P4, NSK 7008A5TYNDUMP4 and Fafnir 3MM9108WI CR DUM. Searchable variants of the number include 7008HDUJ84, 7008 H DU J84 and 7008-H-DU-J84.

What these specs mean in practice

A 25° contact angle steepens the load path through the ball, raising thrust capacity and axial stiffness against a 15° execution on the same envelope. It suits a spindle position carrying genuine axial load alongside its radial load.

Medium preload sits a step above light. It buys more axial and radial stiffness and tighter shaft location, at the cost of a lower speed ceiling and more heat generated in the contact. That is the setting chosen where cut quality and positional repeatability matter more than top spindle speed.

The phenolic cage is light and absorbs oil, so it runs cooler and quieter than brass or steel at high shaft speed, and the 120°C ceiling reflects the phenolic. Riding on the outer-ring land centres the cage on the stationary ring, steadying cage motion through acceleration and deceleration. ABEC 7 precision holds low radial and axial runout and gives close, repeatable shaft location.

Quantity and configuration

Unit Quantity: 2 Pcs. This listing supplies a matched duplex pair, universally ground so the two bearings can be clamped together in any face orientation and will arrive at the designed medium preload.

Interchange guidance

Cross-Reference: SKF 7008 ACD/P4ADGB. Cross-Reference: NSK 7008A5TYNDUMP4. Cross-Reference: FAG B7008-E-T-P4S-DUM. Cross-Reference: Fafnir 3MM9108WI CR DUM. Harmonization Code: 8482.10.50. A same-envelope 7008 set to light preload is a related execution rather than a substitution, because the preload class changes both the stiffness and the speed ceiling.