Sandvik Coromant 5742008 Threading Toolholder Internal External

Product Description

The SANDVIK COROMANT 5742008 is a steel indexable threading toolholder designed for both internal and external threading operations on CNC lathes and turning centers. It features a right-hand orientation and uses a clamp-and-screw insert holding method to secure R166.0L to 11 series inserts. The 1/2-inch round shank and 8-inch overall length make it well suited for through-bore and face threading applications where reach and rigidity are critical. Weighing 0.71 pounds, it is part of the T-Max U-Lock series, built for consistent thread form accuracy across production runs. Machinists and CNC turning specialists are the primary installers of this toolholder.

This toolholder is used in production and job-shop turning environments where threading versatility is required. Its dual internal and external threading capability reduces tooling changeover time on multi-setup jobs. With a minimum bore diameter of 0.63 inches and a head length of 3 inches, it handles a range of bore depths common in shaft, coupling, and fitting applications. The 0.25-inch insert inscribed circle size is appropriate for fine-pitch and standard threading work on ferrous and non-ferrous materials. It is suited for both manual and automated CNC turning programs.

Key Features

• Dual-purpose design supports both internal and external threading from a single toolholder
• Clamp-and-screw insert holding method for positive insert retention under threading loads
• Compatible with R166.0L to 11 insert series for broad thread profile coverage
• 1/2-inch shank diameter with 8-inch overall length for extended reach applications
• Minimum bore diameter of 0.63 inches accommodates small-to-mid bore threading
• Steel construction provides rigidity and durability in continuous turning operations

Compatibility

Designed for use with R166.0L to 11 series threading inserts with a 1/4-inch inscribed circle. Toolholder style is R166.0KF..C within the T-Max U-Lock series.

Installation Notes

Installation is performed by CNC machinists or tool-and-die professionals in a lathe or turning center setup. Power down and lock out the spindle before changing or indexing inserts. Ensure the shank is fully seated and clamped in the turret or toolpost to the machine manufacturer's torque specification. Inspect the insert seat and clamping components for wear or debris before each insert change.