Techniks 05410-318 ER20 Tap Collet 0.318 Inch

Product Description

The TECHNIKS 05410-318 is an ER20 tap collet designed to hold 5/16 inch hand taps in ER20 collet chuck systems. It accepts a decimal bore of 0.318 inches and features a square drive size of 0.238 inches to engage the tap shank and prevent rotation during threading operations. This collet is installed by machinists and CNC tooling technicians in milling machines, machining centers, and tapping fixtures where precise tap alignment and torque transfer are required. Through-coolant and tension-tap features are not included in this design, making it a straightforward rigid-tapping solution for standard hand tap sizes.

This collet is suited for use in manual tapping heads, CNC machining centers, and dedicated tapping attachments that accept ER20 toolholders. It is appropriate for light to medium duty threading applications in production and job-shop environments where 5/16 inch hand taps are used in steel, aluminum, and similar materials. The ER20 series is widely used in general-purpose machining setups across both vertical and horizontal machine configurations.

Key Features

• ER20 collet series for broad compatibility with ER20 chuck systems
• 0.318 inch bore accommodates standard 5/16 inch hand tap shanks
• 0.238 inch square drive size engages tap shank for positive torque transfer
• Designed for hand tap style - not compatible with tension-compression tap holders
• No through-coolant bore, keeping the design compact and straightforward

Compatibility

Designed as a direct-fit replacement or standard tooling component for ER20 collet chucks accepting 5/16 inch hand taps with a 0.238 inch square drive shank.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully powered down and the chuck is secured before inserting or removing the collet. Use the appropriate ER20 spanner wrench and collet nut when seating the collet - do not use pipe wrenches or improvised tools, as this can damage the collet taper or nut threads. Verify tap shank engagement with the square drive pocket before beginning any threading cycle.