NSK7009CTRDULP4YSuper Precision Angular Contact Ball Bearing 45 x 75 x 16 mm 15 Degree Outer Ring Guided Phenolic Cage Light Preload

Product Description

What this part is

An NSK 7009CTRSULP4Y super-precision single-row angular contact ball bearing, 45 mm bore, 75 mm outside diameter, 16 mm wide, ground as a universal single at light preload. The 7000 series is the light section of the super-precision angular contact range.

Decoding the designation

In the NSK scheme 7009 is the ISO 70-series section, C sets the contact angle at 15°, TR is an outer-ring-guided phenolic cage, SU marks the ring faces as universally ground, L is light preload and P4Y is an NSK special class held tighter than P4. 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. An outer-ring-guided phenolic cage is guided on the outer land rather than by the balls, so it runs quietly and stably at speed, absorbs oil, and works to 120 °C. P4Y holds bore, outside diameter and raceway runout tighter than the ABEC 7 baseline, which is what buys repeatable spindle runout.

Quantity and configuration

1 Pc. A single universally ground bearing. Ring faces are ground so any two pieces of the same designation mount back-to-back, face-to-face or in tandem and reach the specified light preload with the rings clamped solid.

Thrust direction

A single-row angular contact ball bearing carries thrust in one direction only, toward the loaded shoulder. Both-direction thrust comes from a back-to-back or face-to-face pair.

Fitting notes

The high shoulder on the outer ring sets the mounting orientation and the etched face marking identifies it. Preload on a universal bearing is developed by clamping the rings solid against the housing shoulder and the shaft nut, so seat squareness governs the running accuracy the P4Y class buys. The phenolic cage suits oil-mist and oil-air lubrication.

Interchange guidance

Direct equivalents are NSK or RHP 7009C at ABEC 7 or better with a phenolic cage and light preload, the RHP form B7009X2TAULEP7, and the Fafnir 2MM9109WI-CR-UL at 15°. A 7009A5 at 25° or 7009A at 30° shares the 45 x 75 x 16 mm envelope but is a related size, not an interchange. A polyamide-cage TYN version has a different speed and temperature profile and medium or heavy preload versions are separate parts.