RHP7008CTDULP4Super-Precision Angular Contact Ball Bearing 40x68x15 mm 15 Degree ABEC 7 Duplex Light Preload Pair

Product Description

What this part is

A super-precision angular contact ball bearing in the 7008 size, supplied as a factory-matched duplex pair. Bore 40 mm, outside diameter 68 mm, width 15 mm per bearing.

Decoding the designation

7008 — ISO angular contact 70-series: 40 mm bore, 68 mm outside diameter, 15 mm width. The 70 series is the light section, with a thinner cross-section than a 72-series bearing of the same bore.
C — 15° contact angle in the RHP scheme.
T — phenolic laminated-fabric cage.
DUL — duplex universal pair, light preload.
P4 — ABEC 7 precision class.

What these specs mean in practice

The 15° contact angle and the light 70-series section together make this the high-speed, low-heat end of the angular contact range for a 40 mm shaft, at the cost of thrust capacity relative to a 25° or a heavier-section bearing. Light preload gives the lowest friction and the lowest steady-state temperature rise of the three preload grades, with correspondingly lower axial stiffness. A phenolic cage suits the cage speeds this combination reaches and 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

The ISO shorthand for this size and angle is 7008 C. Same-envelope 7008 bearings at a 25° contact angle, or at medium or heavy preload, are related sizes rather than interchanges. A 7208 is a heavier section on the same 40 mm bore, not a substitute.