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E-Z LOK™ Tap - HSS - STI - Bottoming - 3/8-24

SKU: 31070


E-Z LOK™ Tap - HSS - STI - Bottoming - 3/8-24

Screw thread insert taps (STI taps) operate in the same manner as “standard” taps, but produce an oversized thread specifically for E-Z Coil™ threaded inserts.

During insert installation, the threads cut by an STI tap form the E-Z Coil™ insert into the desired thread size. STI taps are ideal for tapping holes in softer metals that require a strong threaded insert.

E-Z LOK’s E-Z Coil™ STI taps are manufactured from high speed steel (HSS) for superior durability. We offer STI taps in a wide range of inch, metric, and spark plug sizes to meet your unique requirements.


  • These are taps that will produce a larger than nominal size threaded hole to accommodate a helical screw thread insert. A variety of styles are available to tap holes in soft materials where a strong threaded insert is desired.


  • Preparing a slightly larger thread for installation of E-Z Coil

Knowledge Base

Prop 65

Prop 65


WARNING: This product can expose you to chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.