RHP7021CTSULP4Super Precision Angular Contact Ball Bearing – Straight Bore, 105 mm ID, 160 mm OD, 26 mm Width, Open, 15° Contact Angle, Universally Matchable Light Preload

Product Description

What this part is

RHP 7021CTSULP4 is a single super-precision angular contact ball bearing, 105 mm bore, 160 mm outside diameter and 26 mm width. Rings and balls are chrome bearing steel, the cage is machined laminated phenolic and both faces are open. The rings are universally ground so the bearing can be stacked with others of the same designation.

Decoding the designation

7021 is the ISO 70 dimension series with a 105 mm bore. In the RHP scheme C denotes a 15° contact angle, T a machined laminated phenolic cage guided on the outer ring, SUL a single universally ground bearing at light preload, and P4 ABEC 7 precision. The carton also carries RHP B-series B7021X2TAULEP7, where X2 confirms the 15° angle, UL confirms the universal light preload and EP7 confirms P4.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why it is the usual choice for high-speed machine tool spindles. Light preload keeps heat generation and running torque low while removing all internal play. The machined phenolic cage is light, quiet and tolerant of marginal lubrication, and is rated for continuous service to 120 °C.

Load ratings and speed

Basic dynamic load rating 111 kN and basic static load rating 89.5 kN. Limiting speed 8,700 rpm on grease and 13,300 rpm on oil. Approximate mass 1.58 kg.

Quantity and configuration

One bearing. Universal grinding allows any number of these bearings to be stacked back-to-back, face-to-face or in tandem, and the light preload arises from the ground ring offset when two or more are clamped together. A preloaded bearing carries no radial internal clearance, so clearance class does not apply.

Fitting notes

Rings are pressed on their own faces, never through the ball complement. Shaft and housing seats ground to the super-precision fit tables give the preload its intended value. Face marking lines are aligned when stacking so the intended arrangement is held.

Interchange guidance

SKF 7021 CDGA/P4A, FAG B7021-C-T-P4S-UL and NSK 7021CTRSULP4 share the envelope, the 15° angle and the universal light preload, and are direct equivalents. Fafnir 2MM9121WI CR SUL is the Timken equivalent. Fafnir 2MM9122WI covers the 110 mm bore 7022 envelope and NSK 7021CTYNSULP4 substitutes a polyamide cage, so both are related sizes rather than interchanges.