Carmex 27ER4UNP25C Threading Insert 5/8 Inch 4 Tpi

Product Description

The CARMEX 27ER4UNP25C is a solid carbide laydown threading insert designed for external UN thread cutting at 4 threads per inch (TPI). Built to insert style 27ER with a 5/8 inch inscribed circle (IC) and a thickness of 0.251 inches, this right-hand insert carries a PVD-applied TiN coating and a P25C manufacturer grade corresponding to material grade C5. The 60-degree included angle suits standard UN thread profiles. It is intended for use in laydown threading toolholders on CNC lathes and turning centers by machinists and tooling specialists working in production or job-shop environments.

This insert is rated for universal primary workpiece material compatibility, covering material grade codes H, K, M, N, P, and S. Typical applications include threading operations on shafts, fasteners, fittings, and other turned components requiring external UN thread forms. The 4 TPI pitch makes this insert suitable for coarse, large-diameter threading passes where chip control and edge strength are critical. Right-hand cutting orientation is standard for conventional lathe setup.

Key Features

• Solid carbide construction at P25C grade (C5) for wear resistance across a broad material range
• PVD-applied TiN coating for surface hardness and reduced friction at the cutting edge
• 5/8 inch inscribed circle with 0.251 inch thickness fits standard 27ER laydown toolholders
• 60-degree included angle cuts standard UN external thread profiles
• Right-hand cutting orientation for conventional threading direction
• Certified to CE, ISO 13485:2016, ISO 14001:2015, and ISO 45001 quality and environmental standards

Compatibility

Designed for use in 27ER-style laydown threading toolholders. Compatible with workpiece materials spanning grade codes H, K, M, N, P, and S as rated by the manufacturer for universal application.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer torque and clamping specifications. Power down and lock out the machine spindle before indexing or replacing inserts. Inspect the insert pocket and clamping screw for wear or debris before seating a new insert. Do not exceed the recommended depth of cut or feed rate for the 4 TPI thread form, and verify thread pitch with a thread gauge after the first pass.