SKF71906CDP4ADGASuper-Precision Angular Contact Ball Bearing, 30 x 47 x 9 mm, 15 Degree Contact Angle, P4A, Universally Matchable Extra Light Preload, Open

Product Description

What this part is

SKF 71906 CDGA/P4A super-precision angular contact ball bearing. Brand: SKF. Manufacturer Part Number: 71906 CDGA/P4A. Base Number: 71906. Bearing Type: single-row super-precision angular contact ball bearing. Series: 719, extra-light section. Bore: 30 mm. Outside Diameter: 47 mm. Overall Width: 9 mm. Bore Type: straight. Contact Angle: 15°. Contact type: normal, two-point. Number of Rows: 1. Rolling Elements: steel balls. Ring type: one-piece inner and outer rings. Cage Material: non-metallic. Closure Type: open. Precision Class: P4A. Design: high-capacity D. Preload: extra light (DGA). Bearing Material: bearing steel. Coating: none. Item Weight: 0.060 kg (0.13 lb). Design Units: Metric. Unit Quantity: 1 Pc. GTIN: 7316570511604.

Published ratings

Dynamic Load Rating: 7.15 kN (1 607 lbf). Static Load Rating: 4.55 kN (1 023 lbf). Matched condition: measuring load, class A. Universal matching: back-to-back, face-to-face or tandem.

Decoding the designation

71906: SKF 719 series, the extra-light section super-precision angular contact family, 30 x 47 x 9 mm — the same bore and outside diameter as a 7906 in a thinner section. CD: 15° contact angle in SKF’s super-precision scheme; ACD is the 25° build. P4A: SKF super-precision tolerance class, tighter than P5 on bore, outside diameter and running accuracy. DGA: universally matchable, extra light preload.

What these specs mean in practice

The 719 series is the thin section. At 9 mm across a 30 mm bore it puts a spindle into a housing a standard 70-series bearing will not enter, while holding P4A running accuracy. The 15° contact angle keeps ball loading closer to radial, so centrifugal loading and heat generation stay low and the bearing turns fast and cool; the 25° ACD build of the same size carries more thrust with greater axial stiffness.

Extra light preload favours low running temperature and high speed over rigidity. Universal matchability is the convenience: any two DGA bearings of this designation clamp together back-to-back, face-to-face or in tandem, and the ground stand-off produces extra light preload with no shimming. P4A running accuracy reaches the shaft through ground, true seats; on a 9 mm wide ring a distorted housing bore shows up immediately.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing, universally matchable.

Interchange guidance

Genuine 15° cross-references in this envelope are FAG B71906-C-T-P4S, NSK 71906C, NTN 71906C and Fafnir / Timken 2MM9306WI CR, all 30 x 47 x 9 mm at 15°. SNFA numbers also route to SKF. Related builds on the identical envelope: 71906 ACD is the 25° build, with higher thrust capacity and lower speed capability, and DGB and DGC are the light and medium preload grades, which change spindle stiffness and running temperature. The 7906 and 7006 share the 30 mm bore in wider, stiffer sections. Searchable variants of this number are 71906 CDGA/P4A, 71906CDGAP4A, 71906-CDGA/P4A, 71906-CD-P4A-DGA, 71906 CD/P4ADGA, 71906CD and 71906.