Kennametal 1096257 Mdjn Left Hand Indexable Turning Toolholder

Product Description

The KENNAMETAL 1096257 is a left-hand MDJN-style indexable turning toolholder designed for negative rake insert geometries on CNC and manual lathes. Part of the Kenloc series, it uses a clamp-and-screw insert holding method to secure DN..43. style inserts with a 1/2-inch inscribed circle. The shank measures 1 inch wide by 1 inch tall, with an overall length of 6 inches and a head length of 1.24 inches. Constructed from steel, this toolholder is built for stable, repeatable turning operations in production and job shop environments. Licensed machinists and CNC operators are the primary installers.

This toolholder is suited for external turning applications where a left-hand cutting direction is required, such as turning toward the tailstock or specific facing operations. The 3-degree lead angle and negative rake configuration work well with harder workpiece materials where insert strength and edge stability are priorities. It is a single-use toolholder — not a multi-use tool — and does not include coolant-through capability. Typical applications include general-purpose OD turning on steel, cast iron, and similar materials in both prototype and production runs.

Key Features

• Left-hand MDJN toolholder style with 3-degree lead angle for defined cutting geometry
• Accepts DN..43. inserts (1/2-inch inscribed circle) secured by clamp and screw method
• Negative rake configuration for increased insert strength on demanding materials
• Kenloc series steel construction for rigidity and dimensional consistency
• 1 x 1 inch square shank fits standard lathe tool posts and turrets
• 6-inch overall length with 1.25-inch back-of-bar to cutting edge dimension

Compatibility

Designed to accept DN..43. inserts with a complete insert compatibility designation of DN.. 432. Verify insert geometry, IC size, and thickness against the Kenloc series insert selection guide before ordering inserts separately.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before mounting or changing the toolholder. Torque the clamp and insert screw according to the insert manufacturer's specifications found in the toolholder documentation — do not estimate fastener torque. Confirm shank seating and tool height alignment before resuming cutting operations.