DIN6388B EOC or Oz Collet , also known as Spring Collet, is mounted on a drill \ milling machine, drilling and milling chuck, its function is to clamp drill cutter or knife. Er flexible collet is currently the most used. Eoc Collet Its stable performance, high accuracy by the majority of manufacturers trust. EOC Collet All products are precision grinding, in line with the German DIN 6499 specifications precision manufacturing. 

Eoc Spring Collet Specification 

● EOC Collet Material: 42CrMo;
● Eoc Milling Collet Hardness: 46-50HRC;
● Precision Collet Grinding within the hole several times, up to Ra0.4, played a mirror effect;
● ,Eoc 25 Collet Cylindrical blank sockets adopt grinding processing technology, more suitable for high-speed processing;
● Cylindrical and end face grinding, up to Ra0.4, play a mirror effect;
● Surface "green" special coating treatment, improve the surface hardness, wear resistance, improve cleanliness, more stable accuracy, the surface is more smooth, rust, better corrosion resistance, feel more comfortable and more beautiful appearance. 
● Spring Collet Cryogenic treatment
 1, -185 ℃ super-long cryogenic treatment, so that nearly all the retained austenite into martensite;
 2. precipitation of nano-carbide particles, increase the hardness and toughness;
 3. Reduce the residual stress;
 4. Significantly improve wear resistance.
 

Aging processing
≥ 100h ultra-long set to remove the heat aging residual stress grinding process.