1/2-13X3 Unslotted Indented Hex Washer Thread Rolling Screws Screw Partial Thread Zinc Wax (Pack Qty 200) BC-5048RW

For drilled, punched or corred holes in all ductile metals and punch extruded metals. Eliminates chips, requires low drive torque and provides excel lent resistance to vibrational loosening Steel thread rolling screws shall be made from cold-heading steel conforming to the following chemical composition: Carbon: 0.13-0.27%; Manganese: 0.64-1.71% 18-8: 18-8 stainless steel . 410: 410 austenitic stainless steel