Collis Tool 74421 Split Sleeve Tapping Driver MT4

Product Description

The COLLIS TOOL 74421 is a split sleeve tapping driver designed for use with a 7/8 inch tap and a MT4 taper shank machine spindle. The driver accepts a tap with a 0.697 inch shank diameter and a 0.523 inch shank square, providing a secure, positive drive connection during tapping operations. Tap entry depth measures 1-29/32 inches, and the tap projection is 3/8 inch. This driver is used by machinists and tool and die professionals on drill presses, milling machines, and similar spindle-driven equipment where precise tapping is required.

Split sleeve tapping drivers of this type are standard tooling in production machining, toolrooms, and maintenance shops. The MT4 taper shank mounts directly into compatible machine spindles without additional adapters. The split sleeve collet design grips the tap shank securely while allowing tap float to compensate for minor misalignment between the tap and the drilled hole, reducing tap breakage during through-hole and blind-hole threading operations on a variety of materials.

Key Features

• Accepts 7/8 inch tap with 0.697 inch shank diameter
• MT4 taper shank for direct spindle mounting
• 1-29/32 inch tap entry depth for proper seating
• 3/8 inch tap projection
• 0.523 inch tap shank square for positive rotational drive
• Split sleeve design reduces tap breakage by allowing controlled float

Compatibility

Designed for use with machine spindles accepting an MT4 taper shank. Compatible with 7/8 inch taps having a 0.697 inch shank diameter and a 0.523 inch shank square per standard tap shank dimensions.

Installation Notes

Installation is performed by qualified machinists. Ensure the machine spindle is fully stopped and de-energized before mounting or removing the taper shank driver. Clean the MT4 taper and spindle socket thoroughly before seating to ensure full contact and prevent fretting. Verify tap shank dimensions match the driver sleeve before use to avoid slippage or damage during operation.