Hertel 1000187 Lh Mtjn Indexable Turning Toolholder

Product Description

The HERTEL 1000187 is a left-hand MTJN-style negative rake indexable turning toolholder designed for use on metalworking lathes and turning centers. The toolholder accepts TN..33. series inserts, specifically the TN.. 332, secured by a clamp and screw holding method. It features a 1 inch by 1 inch square shank and an overall length of 6 inches, making it a standard-profile holder suitable for external turning operations. Constructed from steel, this holder is part of the Multi-Option series and is built to maintain rigidity and dimensional repeatability through repeated insert changes.

This toolholder is intended for external turning applications on manual lathes, engine lathes, and CNC turning centers where left-hand cutting geometry is required. The negative rake configuration is well suited for interrupted cuts and harder workpiece materials where edge strength is a priority. The 3-degree lead angle and 1.25 inch back-of-bar to cutting edge distance position the insert correctly for consistent chip control and surface finish. It is typically used by machinists and toolroom professionals in job shop and production environments.

Key Features

• Left-hand MTJN toolholder style with negative rake geometry for strong edge support
• Accepts TN.. 332 inserts with a 0.375 inch inscribed circle via clamp and screw retention
• 1 inch by 1 inch square shank with 6 inch overall length for rigid setup
• 1.25 inch back-of-bar to cutting edge distance for precise tool positioning
• 1.12 inch head length for compact nose geometry
• Steel construction for durability and deflection resistance under cutting loads

Compatibility

Compatible with TN.. 332 series indexable inserts with a 0.375 inch inscribed circle. Insert holding is achieved via clamp and screw method standard to MTJN-style toolholders.

Installation Notes

Installation should be performed by a qualified machinist familiar with indexable toolholder setup procedures. Secure the shank firmly in the tool post or turret according to the machine tool manufacturer torque and clamping specifications. Ensure the machine spindle is fully stopped and locked out before changing inserts or repositioning the holder. Verify insert seating and clamp engagement before resuming cutting operations.