Only available in High Speed Steel. The common use for this tap is to retap a damaged 8-1mm nipple seat used on many Italian made replica rifled muskets.
Plug taps have three to five threads chamfered, to cut threads in a through hole, or to start threads in a blind hole, closed at the bottom.
Tap Drills are smaller in diameter than the screw shaft to leave enough metal to cut threads.
Tap Drill Size: for 9-1mm thread use a metric 8MM
This 9-1mm tap is primarily used to recut damaged nipple seat threads on Italian manufactured rifled muskets..