This NSK Spindle is designed for increased durability by utilizing ceramic bearings, for obtaining strong rigidity in both radial direction and thrust directions by utilizing 2 super-precision ceramic bearings on the front side and 2 on the rear side. This NSK Spindle can be used for small-diameter milling, drilling, slitting, chamfering, grinding, etc. • Allowable Motor Speed: 50,000 min-1(rpm) • Spindle Accuracy: Within 1 µm • CHK Style Collet Chuck: e.g. (CHK-3.175) ø1/8" • Weight: 8.92 oz. • NSK Catalog Number: AS81820P Included Equipment: • Chuck Nut (K-265): 1 pc. • Wrench (12 x 14): 2 pcs., (22 x 27): 1 pc. Optional Equipment: • Collet Chuck (CHK-[][]): ø0.5 mm~ø6.0 mm in 0.1 mm increments and ø3/32", ø1/8", ø3/16", ø1/4" • Chuck Nut (K-265): For Collet Chuck (CHK) • Metal Saw Arbor (KCH-03): For ø0.24" (I.D.) x ø1.18" (O.D.) • Drill Chuck Arbor (DCH-J0K): For Jacob's Taper No. 0 • Grindstone Arbor (AGM-03): For grinding wheel with I.D. of ø5mm