Sumitomo U105408 Indexable Grooving Toolholder Gnd Series

Product Description

The SUMITOMO U105408 is an external right hand indexable grooving toolholder in the GND series, designed for precision grooving operations on CNC lathes and turning centers. Built from steel with a screw-type insert clamping method, this toolholder accepts GCML, GCMN, and GCMR insert styles. It delivers a maximum depth of cut of 0.75 inches (19.05mm) and a minimum groove width of 0.1181 inches (3.00mm). The 3/4 inch by 3/4 inch square shank and 5 inch overall length make it a practical choice for standard lathe turret setups where external non-face grooving is required.

This toolholder is suited for external grooving applications on production and job-shop turning equipment. The GNDL toolholder style is configured for right hand cutting direction, making it compatible with standard front-tool-post and gang-tool setups. It is well-suited for machinists and toolroom professionals working in steel, cast iron, and similar machinable materials where consistent groove width and depth repeatability are critical. The multi-use designation means it can serve across a range of compatible insert geometries within the GCMN, GCML, and GCMR families.

Key Features

• Maximum depth of cut of 0.75 inches (19.05mm) for substantial grooving reach
• Minimum groove width of 0.1181 inches (3.00mm) for tight-tolerance groove profiles
• Screw-type insert clamping for secure, repeatable insert indexing
• Compatible with GCML, GCMN, and GCMR insert styles for application flexibility
• Steel construction provides rigidity and resistance to deflection under cutting loads
• Multi-use tool designation supports use across compatible insert geometries in the GND series

Compatibility

Accepts GCML, GCMN, and GCMR indexable inserts. Designed for use in the GND series toolholder system with GNDL-style holders. Verify insert size code compatibility before ordering.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the turret is locked before changing or indexing the toolholder. Torque the insert clamping screw to the insert manufacturer's recommended specification using the appropriate Torx or hex key. Confirm proper shank seating and tool height alignment before returning the machine to operation.