Carmex SIR1250S22U Threading Toolholder Internal Rh

Product Description

The CARMEX SIR1250S22U is an indexable internal threading toolholder designed for right-hand cutting operations on CNC lathes and turning centers. Built from steel, it features a 1.25 x 1.25 inch square shank and a 10 inch overall length, providing the rigidity needed for precise thread-form cutting on internal bores. The holder accepts 22U IR/L inserts secured by a screw clamping method, delivering repeatable insert positioning critical for consistent thread pitch and profile. Machinists and tool-and-die professionals use this holder when threading blind or through bores in production and job-shop environments.

This toolholder is suited for internal threading applications where a minimum bore diameter of 1.5 inches is present. The SIR series style is a standard boring-bar format compatible with common quick-change and block-style tooling systems found on production lathes. It is appropriate for residential shop and industrial production turning operations requiring accurate internal thread generation in steel, aluminum, and similar machinable materials. No coolant-through capability is present on this holder, making it best suited for applications where flood or mist coolant is applied externally.

Key Features

• Internal right-hand threading geometry for CNC lathe and turning center use
• 1.25 x 1.25 inch steel shank provides high rigidity and minimal deflection
• Accepts 22U IR/L indexable inserts with screw holding method for secure, repeatable clamping
• 1.5 inch minimum bore diameter supports a wide range of internal threading jobs
• 10 inch overall length suits deep-bore and extended-reach applications
• SIR series style fits standard tooling block and quick-change setups

Compatibility

Designed to accept 22U IR/L indexable threading inserts. Compatible with standard SIR-series tooling systems on CNC lathes and turning centers that accommodate a 1.25 x 1.25 inch shank.

Installation Notes

Installation should be performed by a qualified machinist or tooling setup technician. Power down and lock out the machine spindle before changing or setting toolholder position. Ensure the shank seating surface and tooling block bore are clean and free of chips before mounting. Verify insert seating and screw torque according to the insert manufacturer's guidelines before taking a test cut.