Tegara BT 40 Pull Stud Retention Knob CNC BT40 Taiwan New ![
MACHINE TAPER SIZE BT40. The ultimate tensile strength of SNCM420 alloy steel is 980 MPa and our material is made in Japan by a very reputable steel manufacturer. Precision finished on the bottom of the flange to improve fitting with the bottom nose of the taper on the tool holder.