Collis Tool 78943 Size 2 Tapping Adapter Through Coolant

Product Description

The COLLIS TOOL 78943 is a Size 2 tapping adapter designed for use in quick-change tooling systems on CNC machining centers and rigid tapping applications. It accepts a tap shank diameter of 0.687 inches and a tap square size of 0.515 inches, providing a secure, positive drive connection during the tapping cycle. Through-coolant capability delivers cutting fluid directly to the tap point, improving chip evacuation and extending tap life in ferrous and non-ferrous materials. This adapter is installed by machinists and CNC setup technicians in production and job-shop environments.

This tapping adapter is suited for horizontal and vertical machining centers running synchronous or rigid tapping cycles. The quick-change interface allows fast tap changes between operations without removing the holder from the spindle, reducing cycle time on high-mix production runs. A flange diameter of 1.88 inches and a projection of 0.35 inches keep the adapter compact in tight-clearance bores. Tap depth reach is 1.37 inches, making it appropriate for standard through-hole and blind-hole tapping at Size 2 capacity.

Key Features

• Size 2 adapter fits taps with a 0.687-inch shank diameter and 0.515-inch square drive
• Through-coolant design channels fluid to the cutting edge for improved tool life and chip flushing
• Quick-change interface enables rapid tap swaps without disturbing the spindle holder
• Projection of 0.35 inches supports compact setups in confined bores
• Tap depth capacity of 1.37 inches covers most standard tapping applications at this size class
• Flange diameter of 1.88 inches provides stable seating in the quick-change body

Compatibility

Designed for use in Size 2 quick-change tapping tooling systems that accept a 0.687-inch tap shank diameter with through-coolant capability.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the tool changer is in a safe state before inserting or removing the adapter. Verify the tap square seats fully and squarely in the drive socket before running the tapping cycle. Follow the machine tool builder guidelines and applicable shop safety procedures when setting up coolant-through tooling.