NTNSuper-Precision Angular Contact Ball Bearing, Back-to-Back Matched Pair, 50 x 80 x 16 mm, 15 Degree Contact Angle, Normal Preload, Phenolic Cage

Product Description

What this part is

NTN 7010C/DBGNP4 is a super-precision single-row angular contact ball bearing supplied as a back-to-back matched pair. Bore 50 mm, outside diameter 80 mm, width 16 mm per bearing, 32 mm across the pair. Contact angle 15°, machined phenolic cage, open on both faces.

Decoding the designation

7010 is the ISO 70 dimension series at a 50 mm bore. C sets the 15° contact angle. DB is a back-to-back pair, ground as a set so the two outer rings meet at their wide faces. GN is NTN’s normal preload grade, sitting between the light GL and the medium GM. P4 is ISO tolerance class 4, equivalent to ABEC 7.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; the 25° and 30° variants of the same envelope trade speed for thrust. Back-to-back mounting spreads the load lines outward, which gives a wide effective support span and good resistance to overturning moments from a cantilevered tool or pulley. Basic dynamic load rating is 29 kN and static rating 16.1 kN per bearing, with a limiting speed of 18 000 r/min. The machined phenolic cage is light, runs quiet, and suits oil-mist and oil-air lubrication in spindle service.

Quantity and configuration

Two bearings, one back-to-back matched pair, 32 mm total width. GN preload is built into the ground ring faces and is established once both rings are clamped.

Fitting notes

Both inner rings and both outer rings clamp solid against their seats and against each other so the ground offsets deliver the intended preload. Alignment marks on the outer ring diameters keep the set in register. Preload takes the place of a radial internal clearance class on a set like this.

Interchange guidance

Cross-references: Fafnir 2MM9110WI CR DB (15° angle, phenolic cage, back-to-back). FAG B7010-C-T-P4S-DB and SKF 7010 CD/P4ADBA are back-to-back sets from those makers; check the preload grade. SKF 7010 CD/P4A and NSK 7010CTYNSULP4 are single universally ground bearings of the same size and angle, so a pair of either fills the same duty; the NSK part carries a ball-guided polyamide cage rather than phenolic. NTN 7010CDBGMP4 and 7010CDBGLP4 differ in preload. The 7010A5 at 25° and the NSK 7010A at 30° are related sizes rather than substitutions.