Sandvik Coromant 5758109 Threading Insert 4 Tpi Stub Acme

Product Description

The SANDVIK COROMANT 5758109 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for cutting right-hand internal Stub Acme threads. It runs at 4 threads per inch (TPI) with a 1/2-inch inscribed circle (12.70 mm) and a thickness of 0.2190 inch (5.56 mm). The insert carries a TiN coating applied via PVD process, which improves surface hardness and wear resistance during threading operations. Manufacturer grade 1020 supports general-purpose carbide threading across a range of ferrous and non-ferrous workpiece materials. Installation is performed by machining professionals operating CNC lathes or manual threading setups.

This insert is suited for internal threading applications requiring Stub Acme thread form on lathes and turning centers. The Stub Acme profile is commonly found in power transmission components, lead screws, and jack assemblies machined in job shops and production environments. The CoroThread 266 insert style accommodates precision threading where consistent thread form, controlled chip evacuation via the F chipbreaker, and repeatable depth are required. This part is sold individually with a minimum order quantity of 10 units.

Key Features

• Solid carbide construction with PVD-applied TiN coating for wear resistance
• Right-hand internal Stub Acme thread form at 4 TPI
• 1/2-inch (12.70 mm) inscribed circle for accurate toolholder seating
• F chipbreaker geometry for controlled chip flow during internal threading
• 60-degree included angle; single tooth per side for precise thread profile
• Part of the CoroThread 266 series for consistent insert-to-holder indexing

Compatibility

Designed for use with CoroThread 266 series toolholders that accept the 22-size insert with the 266RL insert style designation. Verify toolholder bore and insert seat geometry before installation.

Installation Notes

Installation and indexing should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before changing or indexing the insert. Use the correct Torx or insert-clamping key specified by the toolholder manufacturer to secure the insert; do not overtighten by hand or with non-specified tools. Confirm thread form, TPI, and hand of thread match the workpiece drawing before commencing the threading pass.