Kennametal 1712664 Threading Insert 12 Tpi Un Carbide

Product Description

The KENNAMETAL 1712664 is a laydown threading insert designed for single-point internal threading operations on CNC lathes and turning centers. Manufactured from solid carbide in grade KC5025 with a PVD-applied TiAlN coating, this insert cuts right-hand UN internal threads at 12 threads per inch (TPI). The LT16NR12UNCB geometry uses an NR insert style with a CB chipbreaker, giving machinists clean chip evacuation in through-hole and blind-hole threading passes. With a 3/8 inch (9.53 mm) inscribed circle and 0.1430 inch (3.44 mm) thickness, the insert seats consistently in compatible LT16 toolholders. Machining professionals installing this insert work primarily with steel, stainless steel, cast iron, superalloys, and titanium workpieces.

This insert is suited for production threading in job shop and high-volume CNC turning environments. The KC5025 carbide grade with TiAlN PVD coating is engineered for interrupted cuts and abrasive materials, making it a practical choice for aerospace, oil and gas, and general machining applications where UN internal threads are specified. The 12 TPI pitch is commonly required for standard fastener and fitting thread profiles across a wide range of bore diameters.

Key Features

• Solid carbide KC5025 grade with PVD TiAlN coating for extended tool life on steel, stainless, and superalloys
• NR insert style with CB chipbreaker for controlled chip formation during internal threading
• Right-hand cut, UN thread standard at 12 TPI
• 3/8 inch (9.53 mm) inscribed circle — fits LT16 series toolholders
• Thickness of 0.1430 inch (3.44 mm) for consistent seating and repeatability
• Hole diameter of 0.1551 inch (3.94 mm) for standard clamping screw fitment

Compatibility

Designed for use in LT16 series laydown threading toolholders that accept NR-style inserts with a 3/8 inch inscribed circle. Compatible workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium as specified by the manufacturer.

Installation Notes

Installation is performed by qualified machinists following standard CNC lathe tooling change procedures. Power down and lock out the spindle before seating or removing the insert. Use the manufacturer-specified clamping screw torque procedure for LT16 toolholders and confirm the insert seats flush with no rocking before resuming cuts. Inspect the seating pocket for chips or debris before each insert change to maintain positional accuracy.