BT40-ER25-100L ER Collet Chuck CNC Machine Tool Holder BT40 type ER 25 collet chuck are mainly used for CNC machine system, which wit an ultra precision. ChongDe is a manufacture in R&D,production,sales and services with ISO9001 certificate.The main products are precision tool holder,clamping collet,pull stud,nut,spanner and other machine tool accessories with the standards of ISO,DIN,ANSI/ASME,JIS and local GB,etc. Attaching importance to the research and products,we employs many experienced and skilled technicians,so that precision machining can be made according to samples or drawings. Product Features 1. Works on all BT40 machines 2. Run out of the inside shank cone 0.002mm 3. Rear thread for pull stud is M16*2.0P. 4. Collet Chuck accepts all ER25 collets 5. Nickel coating surface, Anti-rust, anti-corrosion, durability better. 6. Tool Holder is Balanced to G2.5 at 20,000 rpm 7. Constructed of alloy steel hardened to 56 - 60 HRC for long, durable service life 8. AT3 or better accuracy standard taper specification for maximum contact with spindle.