Vargus 66238 Internal Threading Toolholder 3/4 in Shank

Product Description

The VARGUS 66238 is a right-hand indexable threading toolholder designed for internal threading operations on CNC lathes and turning centers. Built to the NVRC toolholder style, it accepts 3IR insert geometry secured by a screw-clamp holding method. The shank measures 0.67 inches in height by 3/4 inches in width, with an overall length of 7 inches. Coolant-through capability is built in, supporting chip evacuation and tool life when threading at depth. This toolholder is intended for use by machinists and CNC turning specialists working in production or job-shop environments.

This toolholder suits internal threading applications where bore access and rigidity are priorities. The minimum bore diameter is 0.67 inches, making it appropriate for threading in medium-diameter bores. The neck diameter of 0.50 inches and a head length of 1.25 inches provide clearance geometry suited to through-bore and blind-bore threading passes. The 3/8-inch insert inscribed circle (3IR inserts) is a widely used size in threading tooling systems, giving operators access to a broad range of thread-form inserts.

Key Features

• Right-hand NVRC-style toolholder for internal threading applications
• Accepts 3IR inserts secured by screw-clamp method
• Coolant-through design supports chip flushing and extended insert life
• Minimum bore diameter of 0.67 inches for medium-bore threading access
• 3/4-inch shank width and 5.75-inch shank length provide rigid setup in standard turning center turrets
• Overall length of 7 inches accommodates reach requirements in typical lathe configurations

Compatibility

Designed for use with 3IR threading inserts in screw-clamp indexable toolholder systems. Fits standard 3/4-inch boring bar pockets on CNC lathes and turning centers configured for internal threading.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines and applicable shop safety procedures. Power down and lock out the machine before mounting or removing the toolholder from the turret. Confirm insert seating and screw torque per the insert manufacturer specification before running. Verify coolant-through supply lines are connected and unobstructed before engaging the coolant system.