Sandvik Coromant 5961377 Threading Toolholder Left Hand

Product Description

The SANDVIK COROMANT 5961377 is an indexable threading toolholder designed for both internal and external thread cutting operations. Built to left-hand orientation, this toolholder belongs to the CoroThread 266 series and accepts 266LL to 16 inserts secured by a screw-clamp holding method. The shank measures 0.625 inches in diameter and 0.563 inches in height, with an overall length of 8 inches. Coolant-through capability supports chip evacuation and tool life in demanding threading applications. The body is constructed from steel. This toolholder is installed by machinists and CNC turning center operators working in precision threading environments.

The 5961377 is suited for threading operations on lathes and turning centers where both internal and external thread profiles must be cut using the same toolholder platform. The minimum bore diameter of 0.79 inches makes it appropriate for internal threading on workpieces with adequate bore clearance. The head length of 1.875 inches and a center-to-cutting-edge dimension of 0.472 inches (11.99 mm) position the insert precisely for consistent thread form. This toolholder fits shop environments handling ferrous and non-ferrous materials across production and job-shop turning operations.

Key Features

• Handles both internal and external threading from a single toolholder platform
• Left-hand orientation for dedicated left-hand turning setups
• Coolant-through design aids chip evacuation and extends insert life
• Screw-clamp insert holding method provides rigid, repeatable insert seating
• Steel construction for durability in continuous and interrupted threading cuts
• CoroThread 266 series compatibility with 266LL to 16 inserts

Compatibility

Designed for use with 266LL to 16 series inserts within the SANDVIK COROMANT CoroThread 266 toolholder system. Insert inscribed circle is 3/8 inch (0.375 inches). Confirm insert grade and geometry selection against the workpiece material and thread standard before installation.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and all motion is locked out before mounting or changing the toolholder. Verify that the toolholder shank seats fully and squarely in the turret pocket and that all clamping screws are torqued per the machine tool manufacturer specifications. Confirm minimum bore diameter clearance before engaging internal threading cycles.