Hertel 1000188 Lh Mtjn Indexable Turning Toolholder

Product Description

The HERTEL 1000188 is a left-hand MTJN-style indexable turning toolholder engineered for negative-rake external turning operations on CNC and manual lathes. The holder features a 1 x 1 inch square steel shank and an overall length of 6 inches, making it a rigid, mid-size solution for general turning work. It accepts TN..33. and TN.. 432 series triangular inserts secured by a clamp and screw holding method. The MTJN geometry provides a 3-degree lead angle suited for straight turning, shoulder work, and finishing cuts. Licensed machinists, CNC operators, and toolroom technicians install this holder in turning centers and engine lathes where consistent insert indexing and repeatability are required.

This toolholder is suited for medium-duty turning applications on ferrous and non-ferrous materials in both production and job-shop environments. The 1 x 1 inch shank fits standard OD turning tool stations on most engine lathes and CNC turning centers. The left-hand orientation positions the cutting edge for specific approach directions, particularly when machining toward a shoulder or working on a second operation setup. No coolant-through capability is present, so external flood or mist coolant should be directed at the cutting zone during use.

Key Features

• MTJN toolholder style with left-hand orientation and 3-degree lead angle
• Negative rake geometry reduces cutting forces and extends insert life on rigid setups
• Accepts TN..33. and TN.. 432 triangular indexable inserts
• Clamp and screw insert holding method for secure, repeatable seating
• 1 x 1 inch steel shank with 6 inch overall length for standard tool post fitment
• Head length of 1.19 inches and back-of-bar to cutting edge of 1.25 inches

Compatibility

Designed to accept TN..33. and TN.. 432 series triangular indexable inserts with a 0.5 inch inscribed circle. Fits standard 1 x 1 inch OD turning tool stations on engine lathes and CNC turning centers.

Installation Notes

Installation is performed by a qualified machinist or CNC toolroom technician. Ensure the machine spindle is fully stopped and the turret or tool post is in a safe, locked position before mounting or removing the holder. Verify insert seating and clamp hardware torque against the insert manufacturer guidelines before starting a cut. External coolant should be applied at the cutting zone, as this holder does not support coolant-through delivery.