Kennametal 1288961 Internal Threading Toolholder 1.25in

Product Description

The KENNAMETAL 1288961 is an indexable internal threading toolholder designed for right-hand cutting operations on CNC lathes and turning centers. Built from steel, this toolholder features a 1.25-inch square shank and an overall length of 10 inches, making it well suited for boring and threading applications requiring reach and rigidity. It accepts LT 16NR series inserts secured by a clamp-style insert holding method. The minimum bore diameter is 1.2 inches, and the insert inscribed circle measures 3/8 inch. The toolholder carries the S16 style designation within Kennametal's LT Threading series, providing a consistent platform for internal thread forms across a range of workpiece materials.

This toolholder is intended for internal threading operations in production and job-shop turning environments. It is suited for machining internal threads in bores at or above 1.2 inches in diameter. The clamp-style insert retention and LT 16NR insert compatibility make it a practical choice for machinists running high-volume threading cycles where insert indexing speed and repeatability are priorities. Coolant-through capability is not included in this model.

Key Features

• Right-hand cut orientation for standard internal threading setups
• Accepts LT 16NR series inserts with clamp-style retention for secure, repeatable positioning
• 1.25-inch square shank with a neck diameter of 1.0 inch for clearance in bored applications
• Minimum bore diameter of 1.2 inches accommodates a wide range of bore sizes
• Head length of 2.5 inches with back-of-bar to cutting edge and center-to-cutting-edge distances of 0.65 inches each
• Steel construction for durability and dimensional stability under threading loads

Compatibility

Designed to accept LT 16NR series threading inserts using a clamp-style holding method within the LT Threading series product line. Verify insert geometry and thread form before ordering replacement inserts.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine before mounting or adjusting the toolholder. Seat the shank fully in the turret pocket and torque all clamping screws to the machine or toolholder manufacturer's specifications using calibrated tooling. Confirm tool centerline height and overhang before taking a threading pass.