Kennametal 1097257 Threading Toolholder External Left Hand

Product Description

The KENNAMETAL 1097257 is a left-hand external indexable threading toolholder from the Top Notch series. It accepts N.3L inserts held in place by a clamp-style insert-holding method, making insert changes fast and repeatable on the shop floor. The shank measures 1 inch wide by 1 inch tall (25.40 x 25.40 mm) with an overall length of 5 inches (127 mm). The head length runs 1.25 inches (31.75 mm) and supports a maximum depth of cut of 0.21 inches (5.33 mm). Licensed machinists and toolroom technicians install this holder in CNC lathes and manual turning centers for external threading and grooving operations.

This toolholder is suited for external threading and grooving applications on turning equipment where a left-hand orientation is required. The Top Notch series is a well-established platform for indexable threading work across a range of thread forms. The center-to-cutting-edge dimension is 0.50 inches and the back-of-bar to cutting edge measures 1.25 inches, providing consistent tool positioning for repeatable thread quality. It is designated as a multi-use tool, supporting both threading and grooving setups without changing the holder body.

Key Features

• Left-hand external orientation for threading and grooving on CNC and manual lathes
• Top Notch series platform accepts N.3L indexable inserts
• Clamp-style insert holding for secure seating and quick index changes
• 1 inch x 1 inch square shank fits standard toolholder blocks and turrets
• Maximum depth of cut of 0.21 inches (5.33 mm)
• Multi-use designation supports both threading and grooving operations

Compatibility

Designed for use with N.3L series indexable inserts in the Kennametal Top Notch platform. Compatible with CNC lathes and manual turning centers that accept a 1 inch square shank toolholder.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before mounting or changing the toolholder or insert. Verify that the shank bore and turret seat are clean and free of chips before seating the holder. Confirm insert orientation and clamping torque per the machine shop's standard procedure before resuming cutting operations.