SKF7020 CD/P4ADGASuper Precision Angular Contact Ball Bearing Pair – Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Universally Matchable.

Product Description

What this part is

SKF 7020 CD/P4ADGA super-precision single-row angular contact ball bearing, supplied as a universally matchable pair. Bore: 100 mm. Outside diameter: 150 mm. Width: 24 mm per bearing. Series: 70 (dimension series 10). Contact angle: 15°. Precision class: P4A, equivalent to ABEC 7. Open on both faces.

Decoding the designation

CD: 15° contact angle, D-design high-capacity execution. P4A: super-precision running accuracy and tolerance class. DGA: light preload on a universally matchable set. GA identifies the SKF preload step, and the set can be mounted back-to-back, face-to-face or in tandem to suit the spindle layout.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why it is the standard choice for machine-tool spindles and high-speed screw drives. Dynamic load rating: 83.2 kN. Static load rating: 85.0 kN. Limiting speed: 14,000 rpm. Maximum operating temperature: 120 °C. The machined phenolic cage is outer-ring-land-riding, running light and quiet at high speed and tolerating oil-mist and oil-air lubrication.

Quantity and configuration

Two bearings, supplied as a universally matchable pair with light preload. Ground faces set the preload directly when the rings are clamped, with no spacer grinding.

Fitting notes

Shaft seat to h5 or better and housing bore to H6 or better preserve the P4A running accuracy. Clamping is applied evenly to the inner ring faces and the outer ring faces so the ground offsets establish the preload.

Interchange guidance

Equivalent super-precision executions at 15° and light preload: FAG B7020-C-T-P4S-UL, NSK 7020CTYNSULP4, Fafnir 2MM9120WI-CR-DUL. Punctuation variants of the designation: 7020CDGA/P4A, 7020 CD/P4A DGA, 7020-CD-P4A-DGA.