Sumitomo U103382 Indexable Turning Shim Iwsn 0.5 in

Product Description

The SUMITOMO U103382 is an IWSN-series shim designed for indexable turning toolholders. It seats beneath a trigon (W-shape) insert to maintain precise cutting-edge height and protect the toolholder pocket from wear. The shim measures 0.1875 inches thick and is compatible with both left-hand and right-hand cutting setups. Weighing just 0.05 pounds, it is a small but critical component in maintaining dimensional accuracy and extending toolholder service life. Machinists and toolroom technicians install this shim during insert changes or when restoring pocket geometry on worn holders.

This shim is suited for CNC turning centers and manual lathes running external turning operations. It is sized for a 0.5-inch (12.70 mm) inscribed circle trigon insert and fits toolholders in the IWSN series. The IWSN shim style is commonly specified in production turning environments where consistent insert seating is required across multiple tool changes. Both left-hand and right-hand toolholder configurations are supported.

Key Features

• IWSN shim style for precise insert seating in indexable turning holders
• Compatible with trigon (W-shape) inserts with a 0.5-inch (12.70 mm) inscribed circle
• Thickness of 0.1875 inches for accurate cutting-edge height registration
• Supports both left-hand and right-hand cutting directions
• Fits A-MWLN R/L, DWLN R/L, MWLN R/L, and WWLN R/L toolholder styles
• Lightweight at 0.05 pounds — minimal mass addition to the toolholder assembly

Compatibility

Designed for use with A-MWLN R/L, DWLN R/L, MWLN R/L, and WWLN R/L series toolholders accepting a trigon insert with a 0.5-inch inscribed circle. Compatible with left-hand and right-hand cutting configurations in the IWSN toolholder style.

Installation Notes

Installation is performed by a machinist or toolroom technician during insert indexing or toolholder pocket maintenance. Power down and lock out the machine spindle before accessing the toolholder. Ensure the shim pocket is clean and free of chips or debris before seating the shim, as contamination will affect insert height and surface finish. Use the manufacturer-specified torque wrench for the insert clamping screw — do not over-tighten or substitute fasteners.