RHP7209CTDULP4Super-Precision Angular Contact Ball Bearing 45x85x19 mm 15 Degree ABEC 7 Duplex Light Preload Pair

Product Description

What this part is

A super-precision angular contact ball bearing in the 7209 size, supplied as a factory-matched duplex pair. Bore 45 mm, outside diameter 85 mm, width 19 mm per bearing.

Decoding the designation

7209 — ISO angular contact 72-series: 45 mm bore, 85 mm outside diameter, 19 mm width.
C — 15° contact angle in the RHP scheme, the same class as the X2 suffix in the RHP B-series numbering.
T — phenolic laminated-fabric cage.
DUL — duplex universal pair, light 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: less centrifugal ball loading and less heat than a 25° or 40° bearing of the same envelope, and proportionally less thrust capacity. Light preload gives the lowest running friction and the lowest steady-state temperature rise of the three preload grades, at lower axial stiffness than medium or heavy. The phenolic cage is light and self-lubricating, which is what makes the high cage speeds of a 15° P4 bearing practical, and it sets a lower temperature ceiling than machined bronze.

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

Genuine same-spec equivalents: RHP B7209X2TADULEP7 and Fafnir 2MM209WI-CR-DUL, both 15° light-preload universal pairs at the same precision class. Same-envelope 7209 bearings at a 25° or 40° contact angle, or at medium or heavy preload, are related sizes rather than interchanges.