Seco 00014445 Lh Mtjn Indexable Turning Toolholder

Product Description

The SECO 00014445 is a left-hand MTJN-style indexable turning toolholder designed for negative-rake external turning operations on CNC lathes and manual turning centers. It features a 1 x 1 inch square shank with an overall length of 6 inches and accepts TN..43. series triangular inserts held in place by a combination clamp and pin (Multiple Lock) system. The negative rake geometry and -5 degree rake angle make this holder well-suited for heavy interrupted cuts and hard materials. It is a steel-body holder intended for installation by machinists and CNC setup technicians.

This toolholder is built for universal turning applications across a broad range of workpiece materials including ferrous, non-ferrous, stainless, superalloys, and cast materials, corresponding to ISO material groups H, K, M, N, P, and S. Typical use cases include OD turning on production and job-shop lathes where a rigid, left-hand cutting direction is required. The MTJN style provides a -3 degree lead angle, directing cutting forces toward the spindle for improved stability during straight turning passes.

Key Features

• Left-hand cutting direction with MTJN toolholder style and -3 degree lead angle
• Negative rake geometry with -5 degree rake angle for heavy-duty and interrupted cutting
• Multiple Lock insert retention system using clamp and locating pin for secure insert seating
• Accepts TN..43. (TN43) triangular inserts with 0.5 inch inscribed circle
• 1 x 1 inch square steel shank with 6 inch overall length for rigid setup
• Compatible with universal workpiece material groups: H, K, M, N, P, S

Compatibility

Accepts TN..43. series triangular inserts with a 0.5 inch (1/2 inch) inscribed circle. SECO catalog reference MTJNLS164. Designed for OD turning applications on lathes requiring a left-hand cutting direction toolholder with negative rake. Coolant-through is not supported on this holder.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the machine fully stopped and locked out per applicable safety procedures. Secure the shank firmly in the tool turret or tool post to the machine manufacturer's recommended clamping torque using appropriate tooling hardware. Verify insert seating and clamp engagement before running the spindle. Follow the insert manufacturer's recommended speeds and feeds for the selected TN43 insert grade and workpiece material.