RHP7208CTDUMP4Super-Precision Angular Contact Ball Bearing 40x80x18 mm 15 Degree ABEC 7 Duplex Medium Preload Pair

Product Description

What this part is

A super-precision angular contact ball bearing in the 7208 size, supplied as a factory-matched duplex pair. Bore 40 mm, outside diameter 80 mm, width 18 mm per bearing.

Decoding the designation

7208 — ISO angular contact series: 40 mm bore, 80 mm outside diameter, 18 mm width.
C — 15° contact angle in the RHP scheme. The B-series equivalent number carries the X2 suffix, which is the same 15° class.
T — phenolic laminated-fabric cage.
DUM — duplex universal pair, medium preload.
P4 — ABEC 7 precision class.

What these specs mean in practice

A 15° contact angle is the high-speed end of the angular contact range: it generates less centrifugal ball loading and less heat than a 25° or 40° bearing of the same envelope, and carries proportionally less thrust. Medium preload sits between light and heavy, trading a rise in friction and heat for greater axial stiffness and tighter running accuracy under load. The phenolic cage is light and self-lubricating, suited to high cage speeds, and sets a lower temperature ceiling than a machined bronze cage.

Quantity and configuration

2 Pcs — one matched duplex pair. Universal grinding allows the pair to be assembled back-to-back, face-to-face or in tandem.

Fitting notes

The preload is ground into the ring faces and is realised only when both inner rings and both outer rings are clamped solidly against their seats. Alignment marks on the outer ring faces set the intended arrangement.

Interchange guidance

The RHP B-series equivalent is 7208X2TADUMEP7. Same-envelope 7208 bearings at a 25° or 40° contact angle, or at light or heavy preload, are related sizes rather than interchanges.