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E-Z LOK™ Tap - HSS - STI - Bottoming - 4-40

SKU: 20270


E-Z LOK™ 4-40 STI Tap

Unlike “standard” taps, E-Z LOK™ STI taps create large, oversized threads that are specifically meant for E-Z Coil™ threaded inserts.

When installing the insert, the threads that are cut by the 4-40 STI tap fit the E-Z Coil™ insert into the specific thread size. These unique taps are ideal for tapping holes in soft metals that require robust threaded inserts.

The 4-40 STI tap is designed for long-lasting durability and is made out of high speed steel (HSS).


  • These sturdy taps make large-sized threaded holes to hold helical screw thread inserts.


  • 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.