Kraciva ER16 Collet Set, 12 Piece 0.0003" TIR Precision Spring Collets

Key features

• 0.0003" TIR ULTRA-PRECISION GRIND Each ER16 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 ER16 collet concentricity means better surface finish, reduced tool chatter, and extended end mill and drill life across every CNC milling, turning, and drilling operation.
• 12-PIECE ER16 COLLET SET FULL RANGE Complete ER-16 collet set with 12 sizes covering 1/32" through 3/8", including: 1/32" , 1/16", 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8". 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 ER16 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 ER16 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.

Kraciva ER16 Collet Set — Production-Grade Precision for Demanding Machining In high-production CNC environments, collet runout isn't just a quality issue — it's a cost issue. Every tenth of a thousandth of runout translates to faster tool wear, poorer surface finish, and scrapped parts. The Kraciva ER-16 collet set is engineered to 0.0003" TIR (0.008mm) concentricity — tighter than standard AA-grade specifications — so your tools cut true, your parts come out right, and your bottom line stays healthy. Less runout means less chatter, better finish, and significantly longer tool life — especially critical with carbide end mills where even minor eccentricity accelerates wear. 65Mn Spring Steel. Hardened to HRC 44-48. Built to Hold. Forged from 65Mn high-quality spring steel and heat-treated to a uniform hardness of HRC 44-48, these ER16 collets deliver the elastic memory, fatigue resistance, and clamping force that production machining demands. 65Mn steel is renowned for its excellent spring properties and toughness — it flexes under load and returns to form, cycle after cycle, without losing grip or accuracy. 12 Sizes. Zero Compromises. Why settle for a partial set when you can ha

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