Kraciva ER25 Collet Set, 18 Piece 0.0003" TIR Precision Spring Collets

Key features

• 0.0003" TIR ULTRA-PRECISION GRIND Each ER25 collet in this set is precision-ground to 0.0003" TIR (0.008mm) — exceeding standard AA-grade concentricity — ensuring ultra-low runout at the cutting edge. Tighter ER25 collet concentricity means better surface finish, reduced tool chatter, and extended end mill and drill life across every CNC milling, turning, and drilling operation.
• 18-PIECE ER25 COLLET SET FULL RANGE Complete ER-25 collet set with 18 sizes covering 3/32" through 5/8", including: 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32",3/8", 13/32",7/16", 15/32", 1/2", 17/32", 9/16", 19/32", 5/8". One collet set handles every tool diameter in your shop — no more downtime hunting for missing sizes.
• 65Mn SPRING STEEL | HRC44-48 HARDNESS Forged from 65Mn spring steel and heat-treated to HRC 44-48 for uniform hardness and superior elastic memory, these ER40 collet chucks deliver maximum gripping torque and parallel clamping force. The 16° double-angle taper design distributes pressure evenly around the tool shank, preventing pull-out during heavy cuts and maintaining accuracy across thousands of clamping cycles — built for production CNC environments.
• DIN 6499 | WIDE MACHINE COMPATIBILITY Manufactured to DIN 6499 / ISO 15488 standards for universal interchangeability with all standard ER25 tool holders, collet chucks, and extension holders. Compatible with CAT40/CAT50, BT30/BT40, R8, Morse taper, and straight-shank tool holder systems. Ideal for milling machines, lathes, drill presses, CNC routers, engraving machines, and machining centers — works with end mills, drills, reamers, taps, and boring bars.
• Aluminum storage boxA solid aluminum chuck storage box is used. Each ER25 chuck is individually packaged with thermoplastic, and is equipped with precision cut foam inserts and slots marked with dimensions. Maintain the orderliness, protection, and production readiness of the entire chuck assembly.

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