Techniks 05410-381 ER20 Tap Collet 3/8 Inch Hand Tap

Product Description

The TECHNIKS 05410-381 is an ER20 tap collet designed to hold 3/8 inch hand taps in ER20 collet chucks on CNC machining centers and manual machines. The collet accepts a 0.381 inch bore with a 0.286 inch square drive, providing positive engagement with the tap shank for accurate, controlled tapping operations. This is a non-coolant-through, non-tension collet, suited for standard hand-tap geometry. Machinists and tool crib personnel working in job shops, production floors, and maintenance environments install and maintain these collets as part of a standardized ER tooling system.

This collet is used in ER20 collet chucks mounted to CNC machining centers, drill presses, and tapping heads where 3/8 inch hand taps are required. The ER20 series is a widely adopted standard for light-to-medium toolholding in small-spindle machining applications. Typical applications include threading operations in ferrous and non-ferrous materials across both production and prototype environments. No through-coolant capability is present, making this collet best suited for dry or flood-cooled external coolant setups.

Key Features

• ER20 collet series for broad compatibility with ER20 chucks
• 0.381 inch bore accommodates standard 3/8 inch hand tap shanks
• 0.286 inch square drive size for positive tap engagement
• Hand tap geometry - non-tension, non-coolant-through design
• Lightweight at 0.5 pounds for easy handling and tool change

Compatibility

Designed for use with ER20 collet chucks that accept standard ER20 tap collets with a 3/8 inch hand tap and 0.381 inch bore.

Installation Notes

Installation is performed by machinists or tooling technicians familiar with ER collet systems. Ensure the spindle or chuck is fully de-energized and at a complete stop before changing collets. Seat the collet fully into the ER20 nut before threading onto the chuck body, and tighten using the appropriate ER collet wrench to the chuck manufacturer's specified procedure. Inspect the collet bore and square drive for wear or damage before each use.