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Precision Bearings for Machine Tools Robust Series

The Robust Series represents the epitome of NSK’s art, especially in >> CAT. No.E1257
material, assessment and analysis technologies and consistently
supports high-performance machine tools.

This high-performance series was developed specifically for increasingly Super high-speed angular contact ball bearings (BNR Series)
sophisticated machine tool spindles. offer high-speed rotation while maintaining low heat generation.

1. Complete lineup with a wide range of products

A variety of products is available, including units that satisfy the high accuracy and
high-speed rotation required by machining centers, and products that provide the high
rigidity required by lathes. (Angular contact ball bearings, cylindrical roller bearings,
angular contact ball bearings with seals)

2. High accuracy

More accurate ring roundness and the most advanced engineered polymer technology
used for cages make rotation smoother.

3. High speed

Combination of small-diameter balls and specifically designed grooves boost speed by
20% over standard angular contact ball bearings. In addition, a light-weight ceramic
rolling element for effective high-speed rotation provides a 1.5 times increase in speed.

4. Material technology Super high-speed single-row cylindrical roller bearings (RX
Series) achieve a speed of 3 million dmn.
Super high-speed bearings use highly seizure-resistant SHX materials independently
developed by NSK. The combination of SHX materials and lubrication technology has
resulted in the Spin Shot Series of angular contact ball bearings and the RX Series of
cylindrical roller bearings. RX Series achieves a speed of 3 million dmn. (#40 spindle:
30 000 min-1)

Grease Replenishing System Fine-Lub 2

Enhanced eco-friendly performance; grease lubrication ensures >> CAT. No.E1273
energy-efficient, quiet and environmentally sound operation.

Spindle is automatically replenished with grease at high-speed rotation, a function
that was previously thought impossible. System increases the longevity of a
grease-lubricated, high-speed spindle.

1. Provides small quantities of grease

Feeding grease in small quantities of 0.01 cc per shot every 6 hours enables steady
operation at 20 000 min-1 with no increase in heat generation during replenishment.

2. Maintenance free

Energy-efficient, quiet replenishing system delivers 20 000 continuous hours of
maintenance-free performance at 20 000 min-1.

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