Collis Tool 78925 Size 2 Tapping Adapter Through Coolant

Product Description

The COLLIS TOOL 78925 is a Size 2 tapping adapter designed for use with quick-change tooling systems in CNC and production machining environments. It accepts taps with a 0.141-inch shank diameter and a 0.11-inch square drive size, providing a secure, repeatable connection between the tap and the toolholder. Through-coolant capability directs cutting fluid directly to the cutting zone, helping to extend tap life and improve chip evacuation in deep-hole or high-volume tapping operations. This adapter is installed by machinists and tooling technicians on machining centers and CNC tapping machines.

This adapter is suited for production tapping applications in both job shop and high-volume manufacturing settings. The quick-change interface allows fast tap swaps without removing the entire toolholder assembly, reducing downtime during tool changes. With a flange diameter of 1.88 inches and a projection of 0.32 inches, the 78925 is dimensioned for standard Size 2 quick-change systems. It accommodates a tap depth of 0.85 inches, making it appropriate for a range of common tap shank lengths in this size class.

Key Features

• Size 2 tapping adapter with 0.141-inch tap shank diameter and 0.11-inch tap square size
• Through-coolant design delivers cutting fluid directly to the tap for improved tool life and chip removal
• Quick-change compatible for fast, repeatable tap exchanges without full toolholder removal
• 0.32-inch projection keeps the tap close to the holder for rigidity in tapping operations
• 0.85-inch tap depth accommodates standard shank lengths for Size 2 taps
• 1.88-inch flange diameter fits standard Size 2 quick-change tooling interfaces

Compatibility

Designed as an OEM-style Size 2 tapping adapter for use with quick-change toolholding systems that accept Size 2 tap adapters with a 0.141-inch shank diameter and through-coolant capability.

Installation Notes

Installation is performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is in a safe state before changing or seating the adapter. Verify that coolant passages in both the adapter and the toolholder are clear and aligned before use. Follow the machine tool manufacturer guidelines for clamping force and toolholder engagement to ensure a secure, concentric connection.