Collis Tool 71321 Split Sleeve Tapping Driver MT1

Product Description

The COLLIS TOOL 71321 is a split sleeve tapping driver with an MT1 taper shank, designed for use with 5/16 inch taps in machine tool spindles and drill press setups. The split sleeve design provides positive drive while allowing the tap to float axially, which helps reduce tap breakage during threading operations. Key dimensional specs include a 1 inch tap entry depth, a 3/16 inch projection, a 0.318 inch tap shank diameter, and a 0.238 inch tap shank square. This driver is used by machinists and tool and die trades working in production or job-shop environments.

This tapping driver is suited for light-duty tapping applications on drill presses, milling machines, and similar machine tools where an MT1 taper spindle is present. The 5/16 inch tap capacity makes it appropriate for threading operations in mild steel, aluminum, and similar machinable materials in both job-shop and production settings. It is sold individually and intended for professional machine tool use.

Key Features

• MT1 taper shank mounts directly into standard MT1 spindles without adapters
• Split sleeve drive mechanism provides positive torque transfer while allowing axial float
• 5/16 inch tap capacity covers a common range of threading operations
• 1 inch tap entry depth accommodates standard tap shank lengths
• 0.238 inch tap shank square provides secure, slip-resistant tap engagement
• 3/16 inch projection keeps the tap close to the driver for rigidity

Compatibility

Designed as an OEM-style tapping driver for machine tool spindles with an MT1 Morse taper, accepting 5/16 inch taps with a 0.318 inch shank diameter and 0.238 inch shank square.

Installation Notes

Installation is performed by machinists or tool room technicians. Ensure the machine spindle is fully powered down and locked out before seating or removing the MT1 taper shank. Clean both the taper shank and spindle bore before insertion to ensure full seating and accurate alignment. Do not use the driver with tap sizes outside the rated capacity, as improper fit can cause tap breakage or spindle damage.