This standard specifies steel drill screws with self-tapping screw threads of ST2.9 to ST6.3. Remarks 1. The tip of the drill screw shall be the cutting edge.
JIS B 1124:2003 history
2021JIS B 1124:2021 Drilling screws with tapping screw thread
2015JIS B 1124:2015 Drilling screws with tapping screw thread
2003JIS B 1124:2003 Drilling screws with tapping screw thread