Sandvik Coromant 5757789 Threading Toolholder 1-1/4 Inch

Product Description

The SANDVIK COROMANT 5757789 is an external, right-hand indexable threading toolholder from the CoroThread 266 series. It accepts 266RG-22 inserts secured by a screw-clamp holding method, making insert changes fast and repeatable on the shop floor. The steel shank measures 1.25 inches wide by 1.25 inches tall with a 6-inch overall length. A center-to-cutting-edge distance of 1.5 inches positions the insert geometry accurately for consistent thread form. At 2.62 pounds, the holder is robust enough for production threading on lathes and turning centers. Machinists and toolroom technicians working in metal fabrication, job shop, or precision machining environments are the primary users.

This toolholder is designed for external threading operations on CNC lathes and manual turning machines. The right-hand cutting orientation suits the most common workpiece rotation direction in turning applications. With a 0.5-inch insert inscribed circle, it is sized for moderate-depth threading passes on a range of workpiece diameters. It does not include coolant-through capability, so external coolant or flood coolant delivery is used at the machine. The CoroThread 266 series is built for consistent thread quality across high-volume and precision threading cycles in steel, alloy, and similar machinable materials.

Key Features

• External, right-hand thread cutting orientation for standard lathe setups
• Screw-clamp insert holding for secure, repeatable insert indexing
• Compatible with 266RG-22 series inserts from the CoroThread 266 platform
• 1.25 x 1.25 inch square steel shank for rigid tool clamping in standard turning tool blocks
• 6-inch overall length with 1.5-inch center-to-cutting-edge distance for consistent thread positioning
• No coolant-through porting - compatible with external or flood coolant delivery

Compatibility

Designed for use with 266RG-22 series threading inserts. Fits standard 1.25 x 1.25 inch square shank tool blocks and turrets. Part of the SANDVIK COROMANT CoroThread 266 toolholder system.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before mounting or removing the toolholder from the turret. Secure the shank fully in the tool block to the depth recommended by the machine manufacturer before beginning a threading cycle. Use the correct insert screw torque driver specified for 266RG-22 series inserts when indexing or replacing inserts - refer to the SANDVIK COROMANT CoroThread 266 tooling manual for insert clamping procedure.