Collis Tool 78915 Tapping Adapter Size 1 Through Coolant

Product Description

The COLLIS TOOL 78915 is a Size 1 tapping adapter designed for use in quick-change tap holders and CNC machining applications. It accepts taps with a shank diameter of 0.255 inches and a square drive size of 0.191 inches. The adapter features through-coolant capability, directing cutting fluid directly to the tap for improved chip evacuation and tool life in deep-hole or high-production tapping operations. With a tap depth of 0.950 inches and a projection of 0.280 inches, it provides consistent tap engagement geometry. Machinists and tool room technicians install this adapter as part of a modular quick-change tapping system.

This adapter is suited for production and job-shop environments where frequent tap size changes are required. It fits into quick-change tap holders that accept Size 1 adapters, allowing fast tooling swaps without removing the holder from the spindle. The through-coolant feature makes it especially effective in CNC machining centers equipped with coolant-through spindles, where controlling heat and chip load during tapping is critical to thread quality and tap longevity.

Key Features

• Size 1 tap adapter fits standard quick-change tap holder systems
• Through-coolant design channels fluid directly to the cutting zone
• Tap shank diameter of 0.255 inches for positive drive engagement
• Tap square size of 0.191 inches ensures accurate torque transfer
• Tap depth of 0.950 inches accommodates standard tap shank lengths
• Flange diameter of 1.180 inches for secure, repeatable seating

Compatibility

Designed as an OEM-style replacement or tooling component for quick-change tap holder systems accepting Size 1 tapping adapters with a 0.255-inch shank diameter and 0.191-inch tap square.

Installation Notes

Installation is performed by qualified machinists or tool room technicians. Ensure the machine spindle is fully stopped and the tooling system is depressurized before installing or removing the adapter. Verify that the tap shank and square dimensions match the adapter specifications before seating the tap. When using the through-coolant feature, confirm that the coolant passages in the holder and spindle are properly aligned and unobstructed before operation.