Collis Tool 78919 Tapping Adapter 1/2 Inch Through Coolant

Product Description

The COLLIS TOOL 78919 is a quick-change tapping adapter designed to hold and drive 1/2 inch taps in CNC machining centers, tapping heads, and other quick-change tooling systems. Built for size 1 adapter compatibility, the 78919 features a 0.367 inch tap shank diameter and a 0.275 inch tap square size, allowing secure, positive engagement with the tap shank. The through-coolant design channels coolant directly to the cutting zone, improving chip evacuation and tool life when tapping deep holes in ferrous and non-ferrous materials. Machinists and toolroom technicians working in production environments rely on this adapter for repeatable tap alignment and reduced setup time.

This adapter is suited for use in production machining operations where quick-change tooling systems are standard. It is appropriate for tapping operations on CNC machining centers and tapping machines that accept size 1 quick-change adapters. The through-coolant capability makes it a practical choice when working with materials that generate significant heat or where chip packing in the flute is a concern. It is sold individually and sized for 1/2 inch taps across common threading applications in metalworking and fabrication environments.

Key Features

• Quick-change design for fast tap swaps without removing the toolholder from the spindle
• Through-coolant port delivers coolant directly to the tap cutting edge
• 0.367 inch tap shank diameter with 0.275 inch tap square for positive drive engagement
• 0.280 inch projection and 1.110 inch tap depth for controlled tap engagement
• 1.180 inch flange diameter provides stable seating in the toolholder
• Sized for size 1 adapter systems and 1/2 inch taps

Compatibility

Designed as an OEM-style replacement or direct-fit tapping adapter for quick-change tooling systems accepting a size 1 adapter with a 1/2 inch tap capacity.

Installation Notes

Installation and tap changes should be performed with the machine spindle fully stopped and the machine in a locked-out, de-energized state per applicable lockout/tagout procedures. Ensure the tap shank and square are clean and free of chips before seating the tap in the adapter. Verify through-coolant passages are clear and that the coolant supply line is properly connected before operation. This adapter should be installed and serviced by a qualified machinist or toolroom technician familiar with quick-change tooling systems.