Hertel 1000186 Lh Mtjn Indexable Turning Toolholder

Product Description

The HERTEL 1000186 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 0.75 inch x 0.75 inch square steel shank and an overall length of 4.5 inches, making it a compact, rigid platform for precision turning work. The holder accepts TN..332 inserts via a clamp-and-screw holding method, providing secure insert retention under interrupted cuts and continuous turning. It is part of the Multi-Option series, offering machining flexibility for shops running varied turning programs. Licensed machinists and CNC operators working in production and job-shop environments are the primary users of this toolholder.

This toolholder is suited for external turning applications where a left-hand cutting direction is required. The MTJN lead angle geometry and negative-rake insert orientation make it well-matched to steel and cast iron turning where insert strength and edge durability are priorities. A back-of-bar to cutting edge dimension of 1 inch allows consistent tool positioning relative to the turret or tool post. The 3/8 inch insert inscribed circle (0.375 inches) is compatible with standard TN..332 negative-rake triangular inserts. No coolant-through capability is built into this holder, so coolant delivery must be handled externally if required.

Key Features

• Left-hand MTJN toolholder style for external turning with negative-rake geometry
• Clamp-and-screw insert holding method for secure, repeatable insert seating
• 0.75 inch x 0.75 inch square steel shank for rigid turret or tool-post mounting
• Accepts TN..332 negative-rake triangular inserts with 3/8 inch inscribed circle
• Overall length of 4.5 inches with a 1.12 inch head length
• Multi-Option series design for broad application coverage across turning programs

Compatibility

Designed to accept TN..332 negative-rake triangular inserts with a 3/8 inch (0.375 inch) inscribed circle. Insert holding is via clamp-and-screw method. No other insert families are specified for this holder.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. The machine spindle must be locked and the turret or tool post de-energized before mounting or removing the toolholder. Ensure the shank bore or tool-post slot matches the 0.75 inch shank dimensions before installation. Insert seating and clamping should be confirmed before initiating any cutting cycle.