Accupro 40278046 Clamping Screw M4 Torx HFC13 Milling

Product Description

The ACCUPRO 40278046 is an M4 clamping screw designed to secure indexable inserts on milling cutter toolholders. Manufactured from steel, this Torx-drive fastener provides reliable insert clamping force during milling operations. At 10.5 millimeters in overall length, it is sized for HFC13 series toolholders and delivers consistent seating across indexable insert changes. Machining professionals and tool crib technicians rely on replacement clamping screws like this one to maintain proper insert retention and cutting geometry. Sold individually, it is a direct replacement for worn or damaged hardware in high-cycle milling environments.

This clamping screw is intended for use with indexable milling cutters that accept HFC13 toolholder-style hardware. It fits applications in both job shop and production machining settings where M4 Torx clamping screws are the specified fastener for insert retention. The CI series designation identifies its design family within the ACCUPRO indexable tooling lineup. Machinists and toolroom personnel performing routine insert changes or toolholder maintenance will use this part to restore proper clamping function.

Key Features

• M4 thread size for compatibility with HFC13 series indexable milling toolholders
• Torx drive type for positive engagement and reduced cam-out during tightening
• 10.5 millimeter overall length sized for correct seating depth in designated toolholders
• Steel construction for strength under repeated clamping cycles
• Sold as a single unit for targeted replacement without surplus inventory

Compatibility

Designed for use with HFC13 style indexable milling cutter toolholders requiring an M4 Torx clamping screw.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with indexable tooling systems. Ensure the milling cutter is removed from the spindle and fully secured before replacing clamping hardware. Use the correct Torx key size for the M4 fastener to avoid drive recess damage. Do not exceed the toolholder manufacturer's specified tightening procedure for insert clamping screws.