Sandvik Coromant 5781920 Threading Insert 16 Tpi 3/8 Inch

Product Description

The SANDVIK COROMANT 5781920 is a solid carbide laydown threading insert designed for external UN thread cutting at 16 threads per inch. It carries a TiCrAlN/TiN PVD coating for wear resistance and thermal stability during high-speed threading operations. Part of the CoroThread 266 series, this right-hand insert features a 60-degree included angle, a 3/8 inch inscribed circle, and a 5/32 inch thickness. It is installed by machinists and tooling specialists on CNC lathes and threading tool holders configured for the 266 insert style. The A chipbreaker geometry supports controlled chip evacuation in single-point external threading applications.

This insert is used in precision threading applications where UN-standard external threads are required. The CoroThread 266 platform is common in production turning environments handling medium to high-volume threading cycles on ferrous and non-ferrous workpieces. The 16 TPI specification targets thread sizes common in general mechanical fastener and connector production. The insert is sold individually with a minimum order quantity of 10 units, making it suited for shop stock replenishment or tooling room inventory.

Key Features

• Solid carbide substrate with TiCrAlN/TiN PVD coating for extended tool life
• Right-hand external UN thread geometry at 16 threads per inch
• 60-degree included angle for standard UN thread form accuracy
• 3/8 inch inscribed circle, compatible with 266-series tool holders
• A chipbreaker for reliable chip control in single-point threading
• Manufacturer grade 1135 optimized for the CoroThread 266 system

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series threading tool holders accepting insert style 266 with a 16-size insert code. Catalog reference number 266RG-16UN01A160M 1135.

Installation Notes

Installation should be performed by a qualified machinist following the tool holder manufacturer torque and seating specifications for the 266 insert pocket. Ensure the tool holder and insert pocket are clean and free of chips or debris before seating the insert. Verify correct insert orientation for right-hand external threading before engaging the workpiece. Always power down and lock out the machine before changing inserts.