Collis Tool 77821 Tension Compression Tapping Chuck

Product Description

The COLLIS TOOL 77821 is a tension and compression tapping chuck designed for precision tapping operations on CNC machining centers, drill presses, and tapping machines. It accepts a 1-inch straight shank and delivers a maximum tap capacity of 9/16 inches, making it suitable for a wide range of production tapping applications. The chuck features a quick-change design with a Size 1 tap adapter and a projection of 3.63 inches. With a nose diameter of 1.37 inches and a shank length of 3.625 inches, it integrates smoothly into standard spindle setups. Licensed machinists and CNC tooling specialists are the primary installers of this chuck.

This tapping chuck is built for use in production and job-shop environments where repeatable, float-compensated tapping is required. The tension and compression float mechanism absorbs axial misalignment between spindle feed rate and thread lead, reducing tap breakage and extending tool life. It is suited to both ferrous and non-ferrous workpiece materials in residential shop, industrial, and commercial manufacturing settings. The Size 1 adapter connection and straight shank interface make it compatible with a broad range of horizontal and vertical machining setups. Pipe tapping capacity covers 1/8-inch pipe tap sizes.

Key Features

• Tension and compression float compensates for axial feed mismatch, reducing tap breakage
• Quick-change design speeds adapter swaps without removing the chuck body from the spindle
• 1-inch straight shank fits standard toolholders and spindle bores
• Maximum tap capacity of 9/16 inches covers a wide range of threading applications
• Tension travel of 7/8 inch and compression travel of 3/8 inch provide generous float range
• Pipe tap capacity of 1/8 inch NPT for light pipe threading work

Compatibility

Designed as an OEM-style tooling component for use with Size 1 tap adapters in standard tension and compression tapping chuck systems accepting a 1-inch straight shank connection.

Installation Notes

Installation and setup should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is powered down and locked out before mounting or removing the chuck. Verify shank diameter and adapter size compatibility with the spindle toolholder before seating the chuck. Do not exceed the rated maximum tap capacity for the installed adapter size.