Bearing 624-ZZNMB (Miniature Deep Groove Ball Bearing)
The 624-ZZNMB miniature deep groove ball bearing is a high-precision rotary support widely used in the guide roller assemblies of WEDM machines, with a 4mm bore, 13mm outer diameter and 5mm width. ZZNMB indicates double shields (ZZ) with a specific brand or specification of sealing and lubrication. Made of high-grade bearing steel with precision-ground balls and raceways, it features precise clearance control, high rotational accuracy and low frictional torque. The shields effectively prevent working fluid and metal chips from entering the bearing, extending grease life and bearing service life. The 624 bearing suits guide rollers, small shafts and other applications requiring high speed, low noise and long service life — one of the most widely used standard components in WEDM machines.

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