RHP7208TADULP4Super-Precision Angular Contact Ball Bearing 40x80x18 mm 40 Degree ABEC 7 Duplex Light 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.
No angle letter in the RHP scheme — 40° contact angle. The B-series equivalent number carries no X suffix, which is the same 40° class; the ISO shorthand is 7208 B.
TA — phenolic laminated-fabric cage, outer-ring land riding.
DUL — duplex universal pair, light preload.
P4 — ABEC 7 precision class.

What these specs mean in practice

A 40° contact angle carries considerably more thrust than the 15° and 25° variants of the same envelope, and accepts a lower speed limit in exchange. Light preload gives the lowest running friction and heat generation of the three RHP preload grades, with correspondingly lower axial stiffness than medium or heavy. A phenolic cage is light and self-lubricating, which suits the cage speeds a precision spindle bearing sees, and it 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, so it 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 7208TDUEP7. Same-envelope 7208 bearings at a 15° or 25° contact angle, or at medium or heavy preload, are related sizes rather than interchanges — the raceway geometry and the ground face offset both differ.