- Premium High Speed Steel
- Use to produce threads for helical coil wire screw thread inserts
- STI taps are oversized so the thread produced accepts a helical coil wire screw thread insert of the same nominal size and pitch.
- Taps are marked with "STI" and the nominal size and pitch of the bolt to be used.
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|STI Straight Flute|
|(Picture may not be an exact match)|