Kennametal 1097579 Indexable Threading Toolholder

Product Description

The KENNAMETAL 1097579 is an indexable threading toolholder designed for both internal and external threading operations on lathes and turning centers. Built in the Top Notch series, this right-hand toolholder accepts NU 3125L inserts secured by a clamp-style holding method. The shank measures 0.75 x 0.75 inches (19.05 x 19.05 mm) with an overall length of 4.5 inches. The toolholder style is NR, and the head length is 1.25 inches with a back-of-bar to cutting edge distance of 1.0 inch. Weighing 0.75 pounds, it is sized for standard tool turrets and boring bar holders in production and job-shop turning applications.

This toolholder suits machinists and CNC lathe operators handling threading tasks on both internal bores and external diameters. The 0.75-inch square shank fits standard tool blocks and turret stations commonly found on medium-duty turning centers. Its right-hand orientation makes it appropriate for conventional left-to-right feeding operations. The Top Notch series is a well-established platform for threading inserts, making this holder a practical fit for shops already running compatible tooling on production turning equipment.

Key Features

• Handles both internal and external threading from a single toolholder platform
• Right-hand holder orientation for standard lathe feed direction
• NR toolholder style accepts NU 3125L indexable threading inserts
• Clamp-style insert retention for secure, repeatable positioning
• 0.75 x 0.75 inch square shank fits common medium-duty turret stations
• No coolant-through feature — external coolant delivery applies

Compatibility

Designed for use with NU 3125L indexable threading inserts within the Kennametal Top Notch series toolholder system. Fits tool blocks and turret stations accepting a 0.75 x 0.75 inch square shank.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing the toolholder. Seat the shank fully in the tool block and tighten clamping screws evenly to manufacturer-specified procedures. Verify insert seating and tool offset entry in the machine controller before taking a cut.