NSK7008CTYDULPA7Super Precision Angular Contact Bearing Pair 40x68x15 mm 15 Degree Light Preload ABEC 7

Product Description

What this part is

An NSK 7008CTYDULPA7 super-precision angular contact ball bearing set, 40 mm bore, 68 mm outside diameter, 15 mm width per bearing. It is a matched duplex pair, ground to run together as one unit.

Decoding the designation

7008 — 70-series single-row angular contact, 40 x 68 x 15 mm
C — 15° contact angle in the NSK scheme
TY — moulded polyamide cage
DUL — duplex, light preload
PA7 — ABEC 7, equivalent to ISO P4

What these specs mean in practice

A 15° contact angle favours speed and radial rigidity over thrust capacity; a 25° bearing in the same envelope trades speed away for more axial load. Light preload keeps running temperature and friction down while still removing axial play, which is why this combination is standard on machine-tool spindles and precision ballscrew ends. The polyamide cage runs quietly and tolerates high speed, with a continuous service ceiling around 120 °C.

Quantity and configuration

Two bearings, supplied as one matched duplex pair. The pair is ground as a set and the preload is only correct when both rings are mounted together in the marked orientation.

Fitting notes

The bearings seat against a square, clean shaft shoulder and housing face, with the V-marks or match marks on the outer rings lined up. Duplex sets are clamped solid against their abutments; no shimming is used to set preload, because the preload is already built into the ground faces.

Interchange guidance

Genuine same-spec equivalents are 15°, P4-class, light-preload duplex 7008 sets: FAG B7008C.T.P4S.DUL, SKF 7008 CD/P4ADGA, Fafnir 2MM9108WI-DUL. Related sizes that share the 40 x 68 x 15 mm envelope but are different parts include 25° variants such as the 7008A5 and 3MM9108WI series, and any single universal (SU) bearing, which is not a matched pair.