Sumitomo U104090 External Grooving Toolholder Gnd

Product Description

The SUMITOMO U104090 is an indexable external grooving toolholder built for precision grooving operations on turning centers and lathes. Designed in the GND style with a right-hand orientation, this toolholder accepts GCML, GCMN, and GCMR inserts secured by a screw-clamp holding method for reliable insert indexing. The shank measures 1 inch by 1 inch with a shank length of 4.559 inches and an overall length of 6 inches. Maximum depth of cut is 0.5 inches. This toolholder is a shop-floor staple for machinists and CNC operators working in production turning environments.

The U104090 is suited for external grooving applications on CNC lathes and manual turning machines in both job shop and production settings. The GND series design accommodates repetitive grooving passes where insert security and repeatable tool geometry are critical. The screw-clamp insert holding method provides firm seating and consistent edge positioning across insert changes, reducing setup time between operations.

Key Features

• External grooving configuration with right-hand cutting orientation
• Maximum depth of cut: 0.5 inches
• Screw-clamp insert holding method for secure, repeatable insert seating
• Compatible with GCML, GCMN, and GCMR insert styles
• Shank dimensions: 1 inch x 1 inch; shank length 4.559 inches; overall length 6 inches
• Multi-use tool design supports a range of grooving operations

Compatibility

Designed to accept GCML, GCMN, and GCMR series inserts. Compatible insert size code: GCML, GCMN, GCMR.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing the toolholder from the turret. Ensure the shank bore and mating surfaces are clean and free of chips before seating the holder. Follow the machine tool manufacturer torque specifications for turret clamping hardware and insert screw fasteners.