Carmex 075-3INT.HOLD Threading Toolholder Internal Rh 3/4in

Product Description

The CARMEX 075-3INT.HOLD is an indexable threading toolholder designed for internal threading operations on CNC lathes and turning centers. Built in the SIR series with a right-hand orientation, this toolholder accepts 16IR indexable inserts secured by a screw-clamp holding method. The shank measures 3/4 x 3/4 inches with an overall length of 7 inches, making it suitable for reaching into bores with a minimum diameter of 0.9 inches. It is the correct choice when a rigid, repeatable internal threading setup is required in a production or job-shop turning environment.

This toolholder is used in internal threading applications on ferrous and non-ferrous workpieces where a 3/8-inch inscribed-circle 16IR insert is the specified cutting geometry. The right-hand cutting direction and SI-style toolholder body suit standard CNC lathe turrets and boring bar setups. The back-of-bar to cutting edge dimension is 0.51 inches, and the center-to-cutting-edge distance is 0.51 inches, supporting predictable tool offset entry during setup. No coolant-through capability is present on this holder, so flood or mist coolant delivery must be arranged externally if required by the application.

Key Features

• Internal threading configuration with right-hand cutting direction
• Accepts 16IR indexable inserts with 3/8-inch inscribed circle
• Screw-clamp insert holding method for secure, repeatable seating
• 3/4 x 3/4 inch square shank, 7 inches overall length
• Minimum bore diameter of 0.9 inches for internal reach
• SIR 0750 P16 style designation for straightforward toolholder selection and cataloging

Compatibility

Designed for use with 16IR series indexable threading inserts with a 3/8-inch inscribed circle. Fits standard CNC lathe and turning center turrets accepting a 3/4 x 3/4 inch square shank toolholder in the SIR series configuration.

Installation Notes

Installation and insert changes should be performed by a qualified machinist or tooling technician with the machine in a full stop, locked-out state per applicable lockout/tagout procedures. Ensure the shank is fully seated and clamped to the turret or toolpost to the torque specification listed in the machine or toolholder manufacturer documentation before resuming cutting operations. Confirm tool offset values after any insert index or holder change. Because this holder does not include coolant-through capability, verify that external coolant lines are positioned to adequately reach the cutting zone prior to initiating threading passes.