Collis Tool 70303 Standard Tapping Driver MT3 Taper Shank

Product Description

The COLLIS TOOL 70303 is a standard tapping driver designed for use with machine tapers in drilling and tapping operations on metal lathes, mills, and drill presses. Featuring an MT3 taper shank, this driver accepts a 1-inch tap with a tap entry depth of 1.63 inches and a 2.3125-inch projection from the shank face. The tap shank diameter measures 0.8 inches with a square drive of 0.6 inches. This tool is suited for machinists and toolroom professionals performing threaded-hole operations in ferrous and non-ferrous materials where repeatable, rigid tap alignment is required.

The 70303 is used in production and maintenance machining environments where MT3-equipped spindles are in service. Typical applications include tapping operations on knee mills, drill presses, and engine lathes outfitted with Morse Taper No. 3 spindles. The driver holds the tap shank securely while allowing controlled torque transmission into the workpiece. It is appropriate for both job-shop and toolroom settings where a rigid tapping setup is preferred over floating-style tap holders.

Key Features

• MT3 taper shank for secure, self-holding fit in compatible machine spindles
• Accepts 1-inch tap with 1.63-inch tap entry depth
• 2.3125-inch projection provides clearance for standard workpiece setups
• 0.8-inch tap shank diameter with 0.6-inch tap shank square for positive drive engagement
• Rigid driver design promotes accurate thread alignment and reduces tap walk

Compatibility

Designed for use with machine spindles fitted with a Morse Taper No. 3 (MT3) socket and compatible with 1-inch taps having a 0.8-inch shank diameter and 0.6-inch square drive.

Installation Notes

Installation is performed by qualified machinists familiar with Morse Taper tooling. Before mounting, ensure the spindle and taper shank are clean and free of chips or burrs to achieve full seating contact. Power down and lock out the machine before inserting or removing the tapping driver from the spindle. Follow applicable shop safety procedures and machine manufacturer guidelines when setting spindle speed and feed for the tap size in use.