Seco 00042506 Mcmn Neutral Indexable Turning Toolholder

Product Description

The SECO 00042506 is a neutral-hand MCMN-style indexable turning toolholder designed for external turning operations on CNC and manual lathes. It accepts CN..64. series inserts, specifically CNMG 643 geometry, held in place via a clamp-and-pin Multiple Lock system for rigid, repeatable insert positioning. The shank measures 1.25 inches wide by 1.25 inches tall with an overall length of 7 inches. Negative rake geometry at -7 degrees suits heavy interrupted cuts and hard materials. Licensed HVAC techs and licensed machinists running production or job-shop turning will find this holder a direct working tool for universal workpiece material ranges.

This toolholder is suited for turning applications across a broad range of workpiece materials, covering ISO material groups H, K, M, N, P, and S. That universal compatibility makes it appropriate for steel, stainless, cast iron, non-ferrous, high-temp alloys, and hardened materials. Typical install scenarios include facing, straight turning, and shoulder work on engine lathes or CNC turning centers where a neutral cutting direction is required to allow left-hand or right-hand pass flexibility. The head length of 1.67 inches and a back-of-bar to cutting-edge distance of 0.625 inches provide consistent tool offset for preset tooling systems.

Key Features

• MCMN toolholder style with neutral hand for bidirectional cutting passes
• Multiple Lock clamp-and-pin insert retention for high stability under interrupted cuts
• Negative rake angle of -7 degrees suited to tough and hardened workpiece materials
• Accepts CNMG 643 inserts with a 0.75-inch inscribed circle
• Steel construction provides rigidity for heavy-duty turning applications
• Universal workpiece material rating covers ISO groups H, K, M, N, P, and S

Compatibility

Designed to accept CN..64. series inserts. Complete insert compatibility is confirmed for CNMG 643 geometry inserts with a 0.75-inch inscribed circle. No additional compatible model or system data was provided in the product specifications.

Installation Notes

Installation and insert changes should be performed by a qualified machinist or tooling technician with the machine powered down and locked out per applicable machine-shop lockout-tagout procedures. Ensure the toolholder shank is properly clamped in the turret or tool post to the full shank engagement depth before operation. Inspect the insert pocket and locating pin for wear or debris before seating a new insert. Do not overtighten the clamp screw beyond the insert manufacturer-specified procedure to avoid pocket damage.