Accupro 771212 Shell Mill Holder CAT50 0.75 Inch Pilot

Product Description

The ACCUPRO 771212 is a CAT50 dual contact taper shank shell mill holder designed for milling operations on CNC machining centers. It features a 0.75 inch pilot diameter, a 2 inch nose diameter, and a flange-to-nose projection of 6 inches, giving it an overall length of 10 inches. Dual contact taper engagement provides simultaneous face and taper contact with the spindle, improving rigidity and runout accuracy. Runout (TIR) is rated at 0.0002 inches. This holder is installed by machinists and CNC tooling technicians in production and job-shop environments.

This shell mill holder is suited for use on CAT50-taper VMCs and HMCs running face mills, indexable shell mills, and similar large-diameter cutters. It accommodates shell mill cutting diameters ranging from 1-3/4 inches to 2 inches. The through-spindle and DIN flange coolant delivery supports directed coolant at the cutting zone, making it appropriate for ferrous and non-ferrous material removal where coolant flow is required. The lock screw uses a 3/8-24 thread. The holder is balanced to 10,000 RPM, making it viable for moderate to higher spindle speeds on production equipment.

Key Features

• CAT50 dual contact taper shank for simultaneous face and taper spindle engagement
• TIR of 0.0002 inches for accurate tool positioning
• Through-spindle and DIN flange coolant delivery
• Balanced to 10,000 RPM
• Shell mill cutting diameter range: 1-3/4 inches to 2 inches
• Lock screw thread size: 3/8-24

Compatibility

Designed for use with CAT50-taper spindle machining centers that support dual contact taper tooling. Compatible with shell mills and face mills having a pilot bore of 0.75 inches and mounting configurations suited to the 2 inch nose diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Clean the spindle taper and holder taper thoroughly before seating to ensure full dual contact engagement. Follow the machine tool manufacturer torque specification for the retention knob and lock screw. Verify runout with a dial test indicator after mounting before initiating any cutting operation.