Accupro 778604 Tapping Chuck BT40 Tension Compression

Product Description

The ACCUPRO 778604 is a taper shank tapping chuck designed for tension and compression tapping operations on machining centers and CNC equipment. It accepts a BT40 taper connection and handles tap sizes from 5/16 inch minimum to 7/8 inch maximum capacity, covering a wide range of standard tap sizes in one setup. The 4.5-inch projection places the tap at the correct working depth for most vertical machining applications. The quick-change design reduces tool changeover time during production runs. This chuck is installed and set up by machinists and CNC operators working in job shops, production facilities, and tool rooms.

The 778604 is suited for general-purpose tapping applications on vertical machining centers equipped with BT40 spindle interfaces. It handles pipe tap sizes from 1/4 inch to 1/2 inch, making it useful for part programs that require both standard and pipe thread tapping in a single setup. The tension and compression floating mechanism compensates for minor feed rate discrepancies, helping protect tap life and thread quality across a range of materials and cycle conditions.

Key Features

• BT40 taper shank for direct spindle mounting on compatible machining centers
• Tension and compression tapping style for feed compensation and tap protection
• Tap capacity range of 5/16 inch to 7/8 inch for standard taps
• Pipe tap capacity range of 1/4 inch to 1/2 inch
• 4.5-inch projection for clearance in typical vertical milling setups
• Quick-change design with Size 2 tap adapter for fast tap swaps

Compatibility

Designed for use with BT40 spindle interfaces and Size 2 tap adapters. Compatible tap capacity ranges from 5/16 inch to 7/8 inch for standard taps and 1/4 inch to 1/2 inch for pipe taps.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator following the machine tool manufacturer's toolholder retention and drawbar torque procedures. Power down and lock out the spindle before mounting or removing the chuck. Verify BT40 taper and chuck bore are clean and free of chips or coolant residue before seating. Confirm tap adapter size compatibility before running a cycle.