NSK7003CTYDULPA7Super Precision Angular Contact Ball Bearing Matched Duplex Pair 17 x 35 x 10 mm 15 Degree Light Preload

Product Description

What this part is

A matched duplex pair of NSK 7003C super-precision angular contact ball bearings, 17 mm bore, 35 mm outside diameter, 10 mm wide each. The 7000 series is the light section of the super-precision angular contact range, used where speed matters more than load capacity.

Decoding the designation

In the NSK scheme 7003 is the ISO 70-series section, C sets the contact angle at 15°, TY is an NSK cage code, DU marks the pieces as a ground duplex set and L is light preload. NSK uses A5 for 25° and A for 30°, so C places this at the high-speed end of the range.

What these specs mean in practice

A 15° contact angle gives the highest limiting speed and the lowest axial stiffness of the standard angular contact angles, which is why grinding and high-frequency spindles use it. Light preload keeps running torque and heat generation down and leaves the most speed headroom of the three standard preloads, at the cost of axial stiffness under load.

Quantity and configuration

2 Pcs, supplied as one matched duplex set. The rings are ground together so the pair reaches the specified light preload when clamped solid, with no shims and no measurement. Stack height for the pair is 20 mm.

Thrust direction

Each bearing on its own takes thrust in one direction. Back-to-back or face-to-face, the pair takes thrust in both directions; in tandem it takes a larger load in one direction only.

Interchange guidance

Direct substitutes are an NSK or RHP 7003C duplex pair at light preload, the RHP form B7003X2TADULEP7, and the Fafnir 2MM9103WI-CR-DUL at 15°. A 7003E or 7003A5 at 25° and a 7003A at 30° share the 17 x 35 x 10 mm envelope but are related sizes, not interchanges. Medium and heavy preload sets of the same number are separate parts.