RHP7012ETDUMP4Super Precision Angular Contact Ball Bearing – Straight Bore, 60 mm ID, 95 mm OD, 18 mm Width, Open, 25 Degree Contact Angle, ABEC 7, Medium Preload, Phenolic Cage

Product Description

What this part is

RHP 7012ETDUMP4 super-precision angular contact ball bearing, 60 mm bore, 95 mm outside diameter, 18 mm width. The inner and outer raceways are offset so the ball contact line runs at an angle across the bearing, which is what lets an angular contact bearing carry thrust in one direction alongside its radial load.

Decoding the designation

Three designations appear on the carton and all three agree. 7012-E-T-DUM-P4 is the RHP form: E gives a 25° contact angle, T a fabric-base laminate phenolic cage, DUM a universally ground duplex execution at medium preload and P4 the ABEC 7 precision grade. B7012-X3-TADUM-EP7 is the RHP B-series form, where X3 is again 25° and EP7 again ABEC 7. 3MM9112WI-CR-DUM is the Fafnir equivalent, where 3MM confirms 25° a third time, CR marks a phenolic outer-land-riding cage, and the 9112 series number corresponds to the ISO 7012 designation.

What these specs mean in practice

A 25° contact angle sits in the middle of the angular contact range, carrying appreciably more thrust than a 15° bearing while keeping more speed capability than a 40°. That balance is why 25° is the common machine tool spindle choice where cutting thrust and high rotational speed both matter. Medium preload gives more stiffness and running accuracy than a light setting at the cost of extra heat generation. Basic dynamic capacity is 45.5 kN and basic static capacity 36.5 kN, with a limiting speed of 14,000 rpm and a phenolic cage that runs well on thin oil films.

Preload and clearance

This bearing is preload-set rather than clearance-set. Internal geometry is fixed by the axial force applied through the ground faces, so radial internal clearance is not a parameter for it and no clearance class applies.

Quantity and configuration

One bearing, 18 mm wide, straight bore, open on both faces, no snap ring groove. Universal grinding means the faces are ground so bearings from the series can be mounted together back-to-back, face-to-face or in tandem, with the medium preload established on clamp-up.

Interchange guidance

The 60 × 95 × 18 mm envelope is the ISO 7012 size. The direct Fafnir equivalent is 3MM9112WI CR DUM, and SKF 7012 ACD/P4A is the same 25° angle and precision grade — on SKF designations the DGA, DGB and DGC suffixes denote preload magnitude rather than a mounting direction. The 2MM9112WI and 7012C executions occupy the same envelope at 15°, so they are related sizes rather than interchanges, because the shallower angle changes both thrust capacity and speed rating.