RHP7206CTDUMP4Super Precision Angular Contact Ball Bearing Pair 30x62x16 mm, 15° Contact Angle, Medium Preload, ABEC 7

Product Description

What this part is

A matched pair of super-precision angular contact ball bearings in the 30 mm bore × 62 mm outside diameter × 16 mm width envelope, the ISO 7206 size. Single row each, machined cage, universally ground so the pair reaches its specified medium preload when clamped solid.

Decoding the designation

In the RHP scheme the 7206 gives the ISO size, C is a 15° contact angle, T the machined phenolic cage, DUM duplex universal with medium preload, and P4 the class equivalent to ABEC 7.

What these specs mean in practice

A 15° contact angle carries more radial load and runs faster than a 25° or 40° bearing of the same size, and carries correspondingly less thrust. Medium preload sits between light and heavy: it gives more axial rigidity and tighter shaft location than light preload, without the heat generation that limits heavy preload at speed. Preload is the fact that separates this pair from an otherwise identical light-preload set, and it is fixed at the factory by the amount of relief ground into the ring faces. The phenolic cage is light, holds an oil film well and sets the temperature ceiling at roughly 120 °C, which governs ahead of the steel.

Thrust direction

Each bearing carries radial load together with thrust in one direction only. Mounted back-to-back or face-to-face the pair locates the shaft axially in both directions, one row acting in each; mounted in tandem both act in the same direction at roughly doubled capacity.

Quantity and configuration

2 Pcs. One universally ground pair, 32 mm total width when clamped solid, supplied without spacers, locknut or housing.

Fitting notes

Universal grinding means the two rings stack back-to-back, face-to-face or in tandem and arrive at the specified medium preload with no shimming or hand grinding. The pair is assembled in the orientation its face marks indicate and the inner rings are clamped solid against one another so the ground relief sets the preload. The preload is only realised when both outer rings seat fully in the housing bore.

Interchange guidance

RHP super-precision designations cross-reference directly to NSK, which acquired RHP and continued the numbering. The same-spec equivalents are NSK 7206CTDUMP4 and Timken 2MM206WI CR DUM. A 7206E at 25°, a plain 7206 at 40°, a light or heavy preload version, or a P5 or P6 class version shares this envelope but is a related size rather than a substitution.