Collis Tool 78934 Tapping Adapter 1/2 in Tap Size 2

Product Description

The COLLIS TOOL 78934 is a tapping adapter designed for use with 1/2 inch taps in quick-change tapping systems. It accepts a Number 2 adapter size and features a tap shank diameter of 0.367 inches and a tap square size of 0.275 inches. Built with through-coolant capability, this adapter delivers coolant directly to the cutting zone, extending tap life and improving chip evacuation in deep-hole or production tapping applications. It is a precision tooling component intended for machinists and toolroom professionals working on CNC machining centers, drill presses, or tapping machines.

This tapping adapter is suited for production and job-shop environments where consistent thread quality and fast tool changes are required. The quick-change design reduces setup time between tap sizes. With a projection of 0.430 inches and a tap depth of 1.620 inches, it accommodates standard 1/2 inch tap geometry in typical through-hole and blind-hole tapping setups. The 1.880 inch flange diameter provides stable seating in the adapter body.

Key Features

• Quick-change design for fast tap swaps in production tapping setups
• Through-coolant capability directs fluid to the cutting edge for improved tap life
• Tap shank diameter of 0.367 inches suits standard 1/2 inch tap shanks
• Tap square size of 0.275 inches for positive drive engagement
• Projection of 0.430 inches and tap depth of 1.620 inches for correct tap seating
• Flange diameter of 1.880 inches for stable adapter retention

Compatibility

Designed for use with Number 2 quick-change tapping adapter systems accepting 1/2 inch tap shank geometry.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians familiar with quick-change tapping systems. Ensure the tapping head and spindle are fully stopped and de-energized before inserting or removing the adapter. Verify that the coolant-through port in the adapter aligns with the coolant supply path in the tapping head before operation. Confirm tap shank and square dimensions match the adapter specifications before securing the tap.