SKF708ACD/P4DBBSuper-Precision Angular Contact Ball Bearings – 8 mm ID, 22 mm OD, 7 mm Width, 25° Contact Angle, Open, P4, DBB Set of Three

Product Description

What this part is

SKF 708 ACD/P4 DBB super-precision angular contact ball bearings. Bore: 8 mm. Outside diameter: 22 mm. Width: 7 mm each. Series: 70, extra-light section. Open on both faces, straight bore, phenolic cage.

Decoding the designation

708: series 70, bore code 8, 8 mm bore. AC: 25° contact angle. D: super-precision spindle design. P4: ABEC 7 precision. DBB: a three-bearing matched set arranged back-to-back.

What these specs mean in practice

A 25° contact angle carries more thrust and gives higher axial stiffness than a 15° bearing of the same size. Basic dynamic load rating: 3.45 kN per bearing. Basic static load rating: 1.5 kN per bearing. Limiting speed: 67,000 rpm, which is what an 8 mm bore extra-light section reaches on a high-frequency spindle. Operating temperature range: -40 to +120 °C, set by the phenolic cage.

Quantity and configuration

Three pieces, 3 Pcs, a factory matched DBB set. Total stack width 21 mm.

Fitting notes

Straight bore, open on both faces. Set pieces mount in the order and orientation marked on their faces. The stack clamps between a shaft shoulder and a locknut, with the outer rings seated square and clamped by the housing cover.

Interchange guidance

SKF 708 ACD/P4A is the same 8 x 22 x 7 mm bearing at 25° supplied as a single piece. 708 CD/P4A is a related size at a 15° contact angle. 708 ACD/P4ADGB is the same bearing as a universally matchable execution at medium preload. Searchable forms: 708ACD/P4DBB, 708 ACD/P4 DBB, 708-ACD-P4-DBB, 708A.