1/2" X 20 STI UNF Intermediate HSS Tap
1/2″ UNF STI Tap - Intermediate
|Thread Diameter inch||1/2|
PowerCoil wire thread inserts are installed into oversize tapped holes. Only PowerCoil STI (Screw Thread Insert) Taps are suitable for use with PowerCoil Wire Thread Inserts.
STI Taps have a larger diameter, than standard taps, but the same pitch to accommodate the wire thread insert. Once the insert is installed in the tapped hole it creates the desired internal thread tolerance for the installed bolt or stud.
STI taps are manufactured from premium quality HSS and are available in taper, intermediate and bottoming leads. HSSE machine taps are available for a large range of sizes in both spiral point and spiral flute.
When using spark plug wire thread inserts it is recommended to use pilot nose STI taps. Pilot nose taps are available to suit all common spark plug sizes.