Collis Tool 78958 Tapping Adapter Size 3 Through Coolant

Product Description

The COLLIS TOOL 78958 is a Size 3 tapping adapter designed for use in quick-change tooling systems on CNC machining centers and tapping machines. It accepts a tap shank diameter of 0.906 inches and a tap square size of 0.679 inches, providing a secure, positive drive connection during threading operations. The through-coolant design delivers cutting fluid directly to the tap, extending tool life and improving chip evacuation in blind and through-hole tapping applications. Licensed machinists and toolroom technicians use this adapter as part of a modular quick-change setup to reduce cycle time when switching between tap sizes.

This adapter is suited for production tapping environments where through-coolant capability is required. Typical applications include tapping ferrous and non-ferrous materials on vertical machining centers, CNC mills, and dedicated tapping machines. The 0.430-inch projection and 1.550-inch tap depth accommodate a range of standard tap lengths at Size 3. The 2.750-inch flange diameter is consistent with standard quick-change tapping tooling interfaces used in high-volume manufacturing and job shop environments.

Key Features

• Size 3 tapping adapter with 0.906-inch tap shank diameter
• Tap square size of 0.679 inches for positive drive engagement
• Through-coolant design for direct fluid delivery to the cutting edge
• Quick-change compatible for fast tap swaps in production settings
• 0.430-inch projection and 1.550-inch tap depth for standard tap lengths
• 2.750-inch flange diameter matches standard quick-change tooling interfaces

Compatibility

Designed as an OEM-style replacement and production tapping adapter for quick-change tapping tooling systems that accept a Size 3 adapter with a 0.906-inch tap shank diameter and 2.750-inch flange diameter.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is powered down and all motion has stopped before installing or removing the adapter. Confirm the coolant circuit is compatible with through-coolant tooling before connecting the adapter. Follow the machine tool manufacturer's torque and clamping procedures for the quick-change tooling system in use.