Accupro 40278848 M4 Clamping Screw Grooving Toolholder

Product Description

The ACCUPRO 40278848 is an M4 clamping screw designed to secure indexable inserts in GD-style grooving toolholders and cutoff tool blocks. Part of the CI series, this hex socket drive fastener is machined from steel for reliable clamping force and resistance to the stresses of interrupted cuts and grooving operations. At 16 millimeters overall length, it is a direct-fit hardware component intended for machinists and toolroom technicians maintaining indexable tooling systems on CNC lathes and turning centers. Sold individually, it is a straightforward replacement when an existing clamping screw is worn, stripped, or lost.

This clamping screw is suited for use in production and job-shop turning environments where GD-style grooving toolholders are in service. It is specifically compatible with cutoff tool blocks that accept M4 fasteners and GD-style hardware. Machinists performing insert changes or toolholder rebuilds on CNC or manual lathes will use this fastener to restore proper insert seating and clamping integrity. It is a single-unit replacement part appropriate for both scheduled maintenance and unplanned tooling repairs.

Key Features

• M4 thread size for use with GD-style grooving toolholder systems
• Hex socket drive for reliable torque application with standard Allen keys
• 16 millimeters overall length provides proper engagement depth in compatible toolholders
• Steel construction withstands clamping loads generated during grooving and cutoff operations
• CI series designation for straightforward cross-reference and reorder
• Sold as a single unit for targeted replacement without surplus inventory

Compatibility

Compatible with GD-style grooving toolholders and cutoff tool blocks that accept M4 clamping screws with hex socket drive.

Installation Notes

Installation is performed by the machinist or toolroom technician servicing the indexable toolholder. Power down and lock out the machine before accessing the toolholder. Use a properly sized hex key to seat the screw evenly without cross-threading the toolholder bore. Do not exceed the toolholder manufacturer's recommended clamping torque for M4 fasteners, and inspect the thread bore for damage before installing a replacement screw.