RHP7205CTDULP4Super Precision Angular Contact Ball Bearing Matched Duplex Pair 25 x 52 x 15 mm 15 Degree Phenolic Cage Light Preload

Product Description

What this part is

A matched duplex pair of RHP 7205C super-precision angular contact ball bearings, 25 mm bore, 52 mm outside diameter, 15 mm wide each. The 7200 series is the medium section of the super-precision angular contact range and one of the most common small spindle sizes in machine tools.

Decoding the designation

In the RHP scheme 7205 is the ISO 72-series section, C sets the contact angle at 15°, T is a phenolic resin cage, DU marks the pieces as a ground duplex set, L is light preload and P4 is ABEC 7. The equivalent RHP B-series form is B7205X2TADULEP7, in which X2 reads the angle a second way as 15° and EP7 restates the class.

What these specs mean in practice

A 15° contact angle gives the highest limiting speed and the lowest axial stiffness of the standard angular contact angles. Light preload keeps running torque and heat generation down and leaves the most speed headroom of the three standard preloads. Phenolic resin rides the outer-ring land, is light and oil-absorbent, and works to about 120 °C. ABEC 7 holds bore, outside diameter and raceway runout close enough that the pair shares load evenly.

Quantity and configuration

2 Pcs, supplied as one matched duplex set. The rings are ground together so the pair reaches the specified light preload with the rings clamped solid, without shims or measurement. Each bearing is 15 mm wide and the pair stacks to 30 mm.

Thrust direction

Each bearing on its own takes thrust in one direction. Back-to-back or face-to-face, the pair takes thrust in both directions; in tandem it takes a larger load in one direction only.

Fitting notes

The V etch across the two outer-ring faces aligns to give the ground arrangement; turning one ring relative to the other changes the preload the set was ground for. The rings clamp solid against the housing shoulder and shaft nut, so seat squareness governs the running accuracy delivered.

Interchange guidance

Direct substitutes are an RHP or NSK 7205C duplex pair at P4 and light preload, the B-series form B7205X2TADULEP7, and the Fafnir 2MM205WI-CR-DUL at 15°. A 7205E at 25° or 7205A at 30° shares the 25 x 52 x 15 mm envelope but is a related size, not an interchange. Medium and heavy preload sets of the same number are separate parts.