Carmex 27IR4.5UNP25C Threading Insert 4.5 Tpi 5/8 Ic Un

Product Description

The CARMEX 27IR4.5UNP25C is a solid carbide laydown threading insert designed for cutting internal UN threads at 4.5 threads per inch (TPI). Built to the 27IR insert style, it features a 5/8 inch (0.6250 inch decimal) inscribed circle and a thickness of 0.251 inches. The TiN coating is applied via PVD process, improving surface hardness and wear resistance. This insert is used by machinists and toolroom professionals on CNC lathes and manual threading equipment where consistent, accurate internal thread profiles are required. The 60-degree included angle conforms to standard UN thread geometry, making it a direct fit for general-purpose threading operations.

This insert is suited for right-hand internal threading on a wide range of workpiece materials. The P25C grade with H, K, M, N, P, and S material codes indicates universal applicability across steel, stainless, cast iron, non-ferrous metals, high-temperature alloys, and similar materials. It is appropriate for both production and job-shop environments where a single insert grade must handle varied material types. Typical applications include threading bores, couplings, fittings, and hydraulic components where UN thread standards are specified.

Key Features

• 27IR insert style with 5/8 inch inscribed circle for secure, repeatable seating in compatible toolholders
• 4.5 TPI thread pitch for coarse internal UN thread cutting
• Solid carbide substrate with P25C grade for wear resistance across multiple material types
• PVD TiN coating reduces friction and extends cutting edge life
• 60-degree included angle conforms to UN thread form geometry
• Right-hand cutting orientation; 0.251 inch insert thickness for stable laydown positioning

Compatibility

Designed for use in 27IR-style internal threading toolholders accepting a 5/8 inch inscribed circle laydown insert. Compatible with workpiece materials coded H, K, M, N, P, and S per ISO material classification.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping specifications. Ensure the machine spindle is fully stopped and the toolholder is properly secured before inserting or indexing the insert. Use the correct torx or clamping screw specified for the 27IR toolholder to achieve proper seating without over-torquing. Verify thread pitch and insert orientation against the job specification before beginning the threading pass.