Seco 00042505 Mcmn Neutral Indexable Turning Toolholder

Product Description

The SECO 00042505 is an MCMN-style neutral-hand indexable turning toolholder designed for right-hand cutting operations on CNC and manual lathes. Built on the Multiple Lock clamping series, it accepts CN..43. style inserts with a 0.5000 inch inscribed circle and holds them at a zero-degree negative rake angle. The shank measures 1 inch wide by 1 inch tall with an overall length of 6 inches. The steel body is machined for consistent insert seating and repeatable tool positioning. Licensed HVAC technicians, machinists, and tool-room professionals handling turning applications will find this a dependable OEM-catalog option for general-purpose stock removal.

This toolholder is suited for turning operations across a broad range of workpiece materials including steel, cast iron, stainless, non-ferrous alloys, and heat-resistant superalloys, reflecting the universal H, K, M, N, P, and S material codes. The right-hand cutting direction and neutral holder orientation make it compatible with standard front-turning and facing setups. With a head length of 1.39 inches and a back-of-bar to cutting edge distance of 0.5 inches, it fits common OD turning positions on most production lathes. Coolant-through capability is not included in this configuration.

Key Features

• MCMN toolholder style with neutral hand orientation for right-hand cutting
• Accepts CN..43. inserts with a 0.5000 inch (1/2 inch) inscribed circle
• Zero-degree negative rake angle for stable, heavy-duty cutting passes
• Multiple Lock clamping series for secure, repeatable insert retention
• Steel shank construction, 1 inch x 1 inch cross-section, 6 inches overall length
• Universal workpiece material compatibility: H, K, M, N, P, S codes

Compatibility

Designed for use with CN..43. style indexable inserts. Manufacturer catalog number MCMNN164 is associated with this toolholder. Verify insert inscribed circle of 0.5000 inches and CN43 insert size code before ordering replacement inserts.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Secure the toolholder in the lathe turret or tool post to the machine manufacturer's specified torque before operating. Ensure the machine spindle is fully stopped and the lathe is locked out prior to inserting or indexing cutting inserts. Follow insert manufacturer guidelines for seating the CN..43. insert and tightening the clamping screw to prevent insert movement during cuts.