Kennametal 1097255 Threading Toolholder External Left Hand

Product Description

The KENNAMETAL 1097255 is an external, left-hand indexable threading toolholder from the Top Notch series, designed for precision threading and grooving operations on CNC lathes and turning centers. The toolholder features a square shank measuring 1 inch wide by 1 inch tall (25.40 x 25.40 mm) and an overall length of 5 inches. It uses a clamp-style insert holding method compatible with N.2L Top Notch inserts. Intended for use by machinists and tooling technicians in production and job-shop environments, this holder brings consistent cutting geometry to external threading applications.

This toolholder is suited for external threading and grooving operations on turning machines where a left-hand cutting orientation is required. The NS toolholder style and Top Notch insert system make it a practical choice for shops running high-volume threading passes on shafts, fittings, and threaded components. The head length is 0.75 inches, and the maximum depth of cut is 0.138 inches (3.51 mm), supporting controlled, repeatable thread-form cuts. The back-of-bar to cutting edge dimension is 1.25 inches, and the center to cutting edge is 0.35 inches.

Key Features

• External, left-hand thread cutting orientation for lathe and turning center use
• Clamp-style insert retention compatible with N.2L Top Notch inserts
• Square shank: 1 inch wide by 1 inch tall for rigid, stable toolpost mounting
• Overall length of 5 inches with a 0.75-inch head length
• Maximum depth of cut of 0.138 inches (3.51 mm) for precise threading passes
• Multi-use design supports both grooving and threading applications

Compatibility

Compatible with N.2L Top Notch indexable inserts. Designed for use within the KENNAMETAL Top Notch toolholder system for external threading and grooving operations.

Installation Notes

Installation is performed by a qualified machinist or tooling technician. Power down and lock out the machine before mounting or removing the toolholder from the turret or toolpost. Ensure the shank is fully seated and clamping screws are torqued per the machine tool manufacturer specification before resuming cutting operations. Do not exceed the maximum depth of cut rating for the insert in use.