Accupro 775492 Shell Mill Holder BT40 1 Inch Pilot

Product Description

The ACCUPRO 775492 is a BT40 taper shank shell mill holder designed for use on CNC machining centers equipped with BT40 spindles. It accepts shell mills with cutting diameters ranging from 2-1/4 to 2-3/4 inches and features a 1-inch pilot diameter for secure cutter registration. The holder provides through-spindle and DIN flange coolant delivery, supporting both internal and external coolant supply configurations. With a total indicator reading (TIR) of 0.0002 inches, the 775492 delivers the concentricity required for consistent face milling and surface finishing operations. The lock screw uses a 1/2-20 thread size.

This shell mill holder is suited for production machining environments where BT40 tooling is standard. Typical applications include face milling, shoulder milling, and surface finishing on ferrous and non-ferrous materials. The dual coolant delivery option makes it compatible with machines equipped with either through-spindle coolant systems or DIN flange coolant ports, expanding its usability across a range of machining center configurations. It is installed and managed by CNC machinists and tooling technicians in job shop and production environments.

Key Features

• BT40 taper shank for direct mounting in BT40 spindle machines
• 1-inch pilot diameter with 2.38-inch nose diameter for rigid cutter support
• Through-spindle and DIN flange coolant delivery for flexible coolant routing
• TIR of 0.0002 inches for precise cutter concentricity
• Accepts shell mills in the 2-1/4 to 2-3/4 inch cutting diameter range
• 1/2-20 lock screw thread for secure cutter retention

Compatibility

Designed as an OEM-style shell mill holder for CNC machining centers with BT40 spindle interfaces and compatible with shell mills having a 1-inch pilot bore in the 2-1/4 to 2-3/4 inch cutting diameter range.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling technician with the machine in a locked-out, zero-energy state before any tooling changes. Use an appropriate BT40 toolholder tightening fixture and retention knob to achieve proper drawbar engagement. Verify runout with a dial indicator after mounting to confirm TIR is within tolerance before beginning a cut. Do not exceed the recommended cutting diameter range for the shell mill pilot bore.