Seco 00012669 Lh Mcln Indexable Turning Toolholder 1x1 Shank

Product Description

The SECO 00012669 is a left-hand MCLN-style indexable turning toolholder designed for external turning operations on CNC lathes and manual turning centers. Built on a 1-inch by 1-inch square shank with an overall length of 6 inches, this toolholder uses a clamp-and-pin Multiple Lock system to secure negative-rake CN-style inserts. The negative rake angle of -5.46 degrees provides stable, controlled cutting performance across a broad range of workpiece materials. The holder is manufactured from steel and is intended for installation and use by machinists and toolroom technicians in production and job-shop environments.

This toolholder is suited for left-hand turning applications where the tool feeds from left to right relative to the workpiece. It accepts CNMG 643 inserts with a 0.75-inch inscribed circle, making it a practical choice for medium to heavy turning passes on universal workpiece materials, including ferrous metals, non-ferrous metals, stainless steels, superalloys, and cast materials corresponding to ISO material codes H, K, M, N, P, and S. The -5 degree lead angle geometry supports efficient chip flow and edge engagement during straight turning cuts.

Key Features

• Left-hand cutting direction for right-to-left spindle travel setups
• Multiple Lock clamp-and-pin insert retention for rigid, repeatable insert seating
• Negative rake geometry at -5.46 degrees for stable cutting on tough materials
• Accepts CNMG 643 inserts with 0.75-inch inscribed circle
• Steel construction for rigidity and durability under continuous turning loads
• Compatible with universal workpiece materials across ISO codes H, K, M, N, P, and S

Compatibility

Accepts CNMG 643 inserts (CN..64. insert family) with a 0.75-inch inscribed circle. Insert holding method is clamp and pin. Compatible workpiece material codes: H, K, M, N, P, S.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the toolholder. Verify the turret pocket or tool post matches the 1-inch by 1-inch shank dimensions before clamping. Confirm insert seating and clamp torque per the machine tool and insert manufacturer guidelines before initiating a cut.