NSK55BNR10HTV1VDUE-01Ultra High Speed Super Precision Angular Contact Spindle Bearing – 55 mm ID, 90 mm OD, 18 mm Width, Open, 18° Contact Angle, Extra-Light Preload, 24900 rpm, P4Y

Product Description

What this part is

An NSK 55BNR10HTV1VDUE-01 ultra-high-speed super-precision angular contact ball bearing from the ROBUST series, built for machine tool main spindles. Bore 55 mm, outside diameter 90 mm, width 18 mm, which is the ISO 7011 envelope. Open on both faces, straight bore, one row of steel balls.

Decoding the designation

The 55 gives the bore in millimetres. BNR is NSK’s ROBUST ultra-high-speed spindle series and fixes the contact angle at 18°, where the companion BER series runs 30°. The 10 gives the ISO 70xx dimension series. DUEL denotes a universally matchable execution at extra-light preload, and P4Y is an NSK special tolerance class held tighter than P4.

What these specs mean in practice

An 18° contact angle sits between the 15° and 25° standards: it carries more thrust than a 15° bearing while keeping most of the speed capability, which is the compromise a machining-centre spindle wants. The limiting speed is 24,900 rpm, roughly a third higher than a conventional 7011 of the same envelope, and the load rating is correspondingly lower because the ball complement is finer. Extra-light preload minimises heat generation, which is what allows those speeds to be sustained. P4Y tolerances hold running accuracy tighter than standard ABEC 7.

Load ratings

Basic dynamic radial rating 15.1 kN (3,390 lbf). Basic static radial rating 12.5 kN (2,810 lbf). Weight 0.414 kg (0.913 lb).

Quantity and configuration

One bearing, 1 Pc.

Fitting notes

Published operating range is −30 °C to 120 °C, on oil or grease. Preloaded bearings carry no internal clearance specification. The ring faces are the preload reference surfaces and are clamped square against the shoulder.

Interchange guidance

The nearest equivalents are other ultra-high-speed 18° spindle bearings in the 55 x 90 x 18 mm envelope, such as the SKF 7011 CD/HCP4A high-speed execution. A conventional NSK 7011CTYNSULP4 shares the envelope at 15° with a higher load rating and a lower speed, so it matches the size rather than the duty. The SKF BSD 5590 and FAG BSB055090-T are ball screw support bearings at 60° and are related sizes only.