Techniks 05510-381 ER25 Tap Collet 0.381 Inch

Product Description

The TECHNIKS 05510-381 is an ER25 series tap collet designed to hold 3/8 inch hand taps in ER25 collet chucks. It accepts a tap shank diameter of 0.381 inches and features a square drive size of 0.286 inches, which engages the tap's square end to transfer torque during threading operations. This collet is intended for use in CNC machining centers, manual mills, and tapping heads equipped with ER25 toolholding systems. Machinists and toolroom technicians install this collet when setting up rigid or floating tap cycles for hand-tap-style tooling.

This tap collet is suited for machine shop environments where ER25 collet chucks are the standard toolholding format. It is configured for hand tap geometry, not pipe taps, and does not support through-coolant or tension-compression tapping applications. Typical use cases include production tapping of threaded holes in ferrous and non-ferrous materials where a 3/8 inch tap size is required. It is compatible with any ER25 collet chuck that accepts standard ER25 tap collets.

Key Features

• ER25 collet series for use in standard ER25 collet chucks
• 0.381 inch shank diameter fits 3/8 inch hand tap tooling
• 0.286 inch square drive size engages tap square for positive torque transfer
• Configured for hand tap geometry, not pipe tap profiles
• No through-coolant bore, keeping the design compact and straightforward
• Non-tension tap design suited for rigid tapping setups

Compatibility

Designed as an OEM-style replacement or standard tooling addition for ER25 collet chuck systems accepting tap collets sized for 3/8 inch hand taps.

Installation Notes

Installation is performed by a machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing collets. Seat the tap collet fully into the ER25 nut before tightening to the chuck body using the appropriate ER collet wrench. Do not overtighten the collet nut, as this can distort the collet bore and affect tap alignment.