Collis Tool 74451 MT4 Taper Shank Tapping Driver

Product Description

The COLLIS TOOL 74451 is an MT4 taper shank split sleeve tapping driver designed to hold and drive 1/2 inch pipe taps in machine tool spindles. It accepts taps with a 0.687 inch shank diameter and a 0.515 inch shank square, with a tap entry depth of 1.5 inches and a 0.375 inch projection. The MT4 taper shank seats directly into compatible machine spindles, providing positive drive engagement through the split sleeve design. This driver is used by machinists and pipefitters running tapping operations on drill presses, lathes, milling machines, and tapping heads where a controlled, repeatable tap drive is required.

This tapping driver is suited to production and job-shop environments where 1/2 inch pipe taps are run in metal or heavy-wall material. The split sleeve grip secures the tap shank square without permanent fixturing, allowing quick tap changes during repetitive threading operations. Applications include threading pipe fittings, manifolds, and ported components in HVAC, plumbing, and industrial fabrication contexts. It is appropriate for use wherever an MT4 spindle interface is available and pipe thread tapping is performed under power feed or hand-controlled machine operation.

Key Features

• MT4 taper shank seats directly into machine spindles for positive drive engagement
• Split sleeve design secures the tap shank square, allowing fast tap changes without permanent fixturing
• 1.5 inch tap entry depth accommodates standard 1/2 inch pipe tap geometry
• 0.687 inch tap shank diameter and 0.515 inch shank square match standard pipe tap dimensions
• 0.375 inch projection keeps tap shank firmly supported during powered threading operations

Compatibility

Designed for use with 1/2 inch pipe taps having a 0.687 inch shank diameter and a 0.515 inch tap shank square, driven from machine tool spindles with an MT4 taper interface.

Installation Notes

Installation is performed by machinists or tool room technicians. Power down and lock out the machine spindle before seating or removing the MT4 shank. Ensure the spindle bore is clean and free of chips or burrs before inserting the taper shank, as debris will cause misalignment and taper damage. Verify the tap shank square is fully engaged in the split sleeve before running the machine under power.