Kennametal 1288937 Threading Toolholder Internal Right Hand

Product Description

The KENNAMETAL 1288937 is an indexable threading toolholder designed for internal threading operations on CNC lathes and turning centers. Built from steel, this right-hand holder accepts LT 16NR inserts secured by a clamp-style holding method. The shank measures 0.75 inches in both width and height, with an overall length of 7 inches (177.80 mm). A minimum bore diameter of 0.90 inches makes it suited for internal thread cutting in bored or pre-drilled workpieces. It belongs to the LT Threading series and is intended for use by machinists and toolroom professionals working in production or job-shop environments.

This toolholder is used in internal threading applications where a rigid, repeatable insert platform is required. The back-of-bar to cutting edge and center-to-cutting-edge distances are both 0.51 inches, providing consistent geometry for thread-form accuracy. The holder does not include coolant-through capability, making it appropriate for setups where external coolant delivery or dry cutting is used. It fits standard tool turrets and boring bar holders that accept a 0.75-inch round shank.

Key Features

• Internal, right-hand threading configuration for lathe and turning center use
• LT 16NR insert compatibility with clamp-style insert retention
• Steel construction for rigidity and durability under interrupted and continuous cuts
• 0.75-inch square shank fits standard tool turret and boring bar positions
• 3/8-inch insert inscribed circle for LT series threading inserts
• Overall length of 7 inches with 0.51-inch center-to-cutting-edge offset

Compatibility

Designed as an OEM-style replacement or direct-fit toolholder for setups using LT 16NR series threading inserts in internal threading applications on CNC turning equipment with a 0.75-inch shank tool station.

Installation Notes

Installation should be performed by a qualified machinist with the machine powered off and in a safe, locked-out state. Secure the shank fully within the tool turret or boring bar holder using the appropriate clamping torque for your machine's tool station. Verify insert seating and clamp engagement before resuming operation. Confirm thread-form geometry against part specifications before committing to production runs.