RHP7008TDUHP4Matched Pair Super-Precision Angular Contact Ball Bearings, 40x68x15 mm Each, Heavy Preload, Universally Ground, P4 / EP7, Phenolic Cage

Product Description

What this part is

A duplex, universally ground matched pair of super-precision angular contact ball bearings, 40 mm bore by 68 mm outside diameter by 15 mm wide per bearing. RHP is the legacy British precision brand now part of NSK Europe, and this is a spindle bearing set, not a general-purpose ball bearing.

Decoding the designation

7008 — angular contact ball bearing, 70 dimension series, 40 mm bore
T — machined fabric-reinforced phenolic cage
DU — duplex, universally ground: the two rings are ground so the pair can be mounted DF, DB or DT and reach a known preload with no shims
H — heavy preload (the light/medium/heavy ladder runs DUL, DUM, DUH)
P4 — ISO tolerance class 4, equivalent to ABEC 7. The RHP grade shown on the alternate number, EP7, is the same accuracy band in RHP’s own scheme

Correcting the source data

The previous copy asserted manufacture in England and in the United Kingdom as a selling point. RHP is a British marque, but no origin marking is documented for this item, so no country of origin is claimed. eBay-era shipping promises and order-now copy have been removed.

What these specs mean in practice

Heavy preload buys you the stiffest spindle of the three grades — less axial deflection under cutting load, better hold of position — and pays for it in heat and a lower speed ceiling. It is the right choice for heavy roughing or a hard-turning spindle, and the wrong one for a high-rpm grinding head, where a DUL set is standard. Preload grades must not be mixed within one arrangement. The phenolic cage is light and tolerant of brief lubricant starvation, which is why precision spindle builders specify it, but it caps operating temperature.

Published ratings and mounting data

No manufacturer-published basic dynamic or static load rating was found for this exact RHP designation, so none is stated here rather than lifting figures from a differently preloaded or differently caged 7008. Boundary dimensions 40 x 68 x 15 mm per bearing are the ISO 70-series values and are confirmed; the pair stacks to 30 mm overall width.

Quantity and configuration

This listing is one matched pair — two bearings. The stock quantity of 1 counts the pair, not the pieces. Do not split the pair: universally ground bearings only deliver their stated preload as the set they were ground into.

Interchange guidance

The RHP alternate designation 7008TDUHEP7 is the same bearing in RHP’s precision-grade scheme. Same-envelope heavy-preload equivalents include NSK 7008CTYNDUHP4 or 7008A5TYNDUHP4 (note that the C and A5 letters set 15° and 25° respectively — check which angle your spindle needs), NTN 7008 with GD2GH-type suffixes, and Fafnir/Timken world numbers in the 2MM9108WI / 3MM9108WI family. RHP precision numbers now route to NSK, so an NSK quote is the current supply path.