Carmex SIR0375K11 Internal Threading Toolholder 5/8 in

Product Description

The CARMEX SIR0375K11 is an indexable internal threading toolholder designed for precision thread-cutting operations on lathes and turning centers. Built to the SIR series standard, this right-hand toolholder accepts 11IR inserts secured by a screw-clamp holding method, providing reliable repeatability during threading passes. The shank measures 5/8 x 5/8 inches with a 5-inch overall length, and the minimum bore diameter is 0.47 inches, making it suitable for threading internal bores in a range of workpiece sizes. Machining professionals in production and job-shop environments select this holder for its consistent insert positioning and straightforward changeover.

This toolholder is configured for internal threading applications where a right-hand cutting direction is required. It fits standard lathe toolposts and boring bar setups that accommodate a 5/8-inch square shank. The 1-inch head length and 0.28-inch center-to-cutting-edge dimension allow access into bores at or above the 0.47-inch minimum diameter. No coolant-through capability is included; external coolant delivery should be used when the application demands it. Machinists running ferrous or non-ferrous materials on manual or CNC turning equipment will find this holder a direct-fit solution for internal threading work.

Key Features

• Right-hand internal threading configuration in the SIR toolholder series
• Accepts 11IR indexable threading inserts with screw-clamp retention
• 5/8 x 5/8 inch square shank fits standard lathe tool blocks and holders
• 0.47-inch minimum bore diameter for access into tight internal features
• 5-inch overall length with a 1-inch head length for reach and rigidity balance
• No coolant-through ports; compatible with external coolant supply setups

Compatibility

Designed for use with 11IR indexable threading inserts and compatible with lathe toolpost systems that accept a 5/8-inch square shank boring bar or toolholder.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the shank firmly in the toolpost or boring bar holder before initiating any cutting operation, and verify insert seating and screw torque per the insert manufacturer guidelines. Power down and lock out the machine spindle before changing inserts or adjusting the holder position. Confirm bore diameter clearance meets or exceeds the 0.47-inch minimum before attempting internal threading passes.