5/16-12X1 1/2 Unslotted Indent Hex Washer Self Drill Screw Full Thread 18-8 Stainless Steel (Pack Qty 600) BC-3124KW188

Type BSD: The 18-8 stainless drill screw offers superior corrosion resistance while the 410 stainless screw will drill through harder material than the 18-8. The hardness of the material to be drilled should be a minimum of 10-20 Rockwell hardness points less than the screw’s hardness Minimum torques are the same for stainless and steel self-drill screws. Drill time is 2.5 seconds for a 1mm thick plate 410 or 18-8 stainless steel