Iscar 2500446 Grooving Cutoff Toolholder Helir 25.4-4T12

Product Description

The ISCAR 2500446 is a right-hand indexable grooving and cut-off toolholder from the Heli-Grip series, carrying the manufacturer catalog designation HELIR 25.4-4T12. It accepts a clamp-style insert holding method and supports a groove width range of 0.157 to 0.187 inches with a maximum depth of cut of 0.47 inches. The shank measures 1.0 inch in height and 1.0 inch in width, with a shank length of 4.86 inches and an overall length of 6.0 inches. Designed for external grooving and cut-off operations, this toolholder is installed by machinists and CNC operators working on turning centers and lathes.

This toolholder is suited for external grooving and cut-off applications on turning equipment. The back-of-bar to cutting edge dimension is 0.94 inches, and the head length is 1.14 inches, making it appropriate for close-clearance grooving scenarios on both manual and CNC lathes. Compatible inserts span the DG and GRIP insert families as well as HGN 300 series inserts, giving the toolholder flexibility across a range of groove profiles and materials.

Key Features

• Groove width range of 0.157 to 0.187 inches for precise external grooving and parting operations
• Maximum depth of cut of 0.47 inches suits typical parting and recessing tasks on turning centers
• Clamp-style insert holding method provides secure indexable insert retention during interrupted cuts
• 1.0 inch square shank with 4.86 inch shank length fits standard toolpost and turret configurations
• Compatible with DG, GRIP, and HGN 300 series insert families, including full-radius GRIP inserts
• Conforms to ISO 13399 cutting tool data representation standards
• No coolant-through feature; external coolant delivery required for chip evacuation in deep cuts

Compatibility

Compatible inserts include DG.., GRIP, and HGN 300 series. Specific compatible insert size codes include DGN-MF, DGN-UT/UA, DGN/DGNC/DGNM-C, DGN/DGNM-J/JS/JT, DGR/L-C, DGRC/LC-C, DGR/L-J/JS, GRIP, and GRIP (Full Radius). Confirmed compatible insert part numbers include DGL 1001J-8D, DGL 1400JS-15D, DGL 1402J-8D, DGL 2200JS-15D, DGL 2200JS-6D, DGL 2202C-6D, DGL 2202J-6D, DGL 3100JS-15D, DGL 3100JS-6D, DGL 3102C-15D, DGL 3102C-6D, DGL 3102J-15D, DGL 3102J-6D, DGL 4003C-4D, DGL 4003J-4D, DGL 5003C-4D, DGL 5003J-4D, and DGL 630.

Installation Notes

This toolholder is installed by qualified machinists on turning centers or manual lathes. Power down and de-energize the machine before mounting or indexing inserts. Ensure the shank is fully seated and clamped to the specified toolpost or turret bore before resuming operation. Follow the machine tool manufacturer guidelines and applicable shop safety standards when setting tool offsets and confirming clearances for the workpiece and chuck.