Iscar 3892085 Internal Threading Toolholder 0.625 Shank

Product Description

The ISCAR 3892085 is a right-hand, internal indexable threading toolholder designed for precision thread-cutting operations on CNC lathes and turning centers. Built to the SI toolholder style in the SIR series, it accepts a wide range of IR and GT-style inserts secured by screw clamping. The shank measures 0.625 x 0.625 inches with an overall length of 6.0 inches and a minimum bore diameter of 0.64 inches. Coolant-through capability supports chip evacuation during internal threading passes. This toolholder is installed and set up by machinists and CNC lathe operators working in precision metalworking environments.

The 3892085 is suited for internal threading applications in both production and job-shop settings. With a maximum depth of cut of 1.26 inches and a head length of 1.26 inches, it handles a broad range of bore depths commonly encountered in turned components. The insert inscribed circle of 0.375 inches and insert thickness of 0.137 inches define the compatible insert geometry. It is appropriate for threading steel, alloy, and other machinable materials across a variety of thread forms supported by its compatible insert list.

Key Features

• Right-hand, internal threading orientation in the SIR toolholder series
• Screw-clamp insert holding method for positive, repeatable insert seating
• Coolant-through design aids chip removal during internal threading passes
• 0.625 x 0.625 inch square shank with 5.5 inch shank length for rigid setup
• Minimum bore diameter of 0.64 inches enables use in tight-bore applications
• Compatible with a broad range of thread forms including UN, ISO, NPT, BSPT, ACME, and more

Compatibility

Compatible insert forms include GTGA, GTMA, IR to MJ, IR/L to 55, IR/L to 60, IR/L to ABUT, IR/L to ACME, IR/L to API RD, IR/L to BSPT, IR/L to ISO, IR/L to NPT, IR/L to NPTF, IR/L to PG, IR/L to RND, IR/L to SAGE, IR/L to STACME, IR/L to TR, IR/L to UN, IR/L to UNJ, and IR/L to W thread forms.

Installation Notes

Installation is performed by a qualified machinist or CNC lathe operator. The machine spindle must be fully stopped and the machine powered down before inserting or indexing the cutting insert. Verify shank clamping torque against the machine tool manufacturer specifications before beginning a threading cycle. Confirm bore clearance against the 0.64 inch minimum bore diameter before tool setup to avoid tool or workpiece damage.