Iscar 5505448 Indexable Shim 3/8 Inch Ivsn Turning

Product Description

The ISCAR 5505448 is a negative-rake shim designed for indexable turning toolholders. Shims seat beneath the cutting insert to maintain proper cutting edge height, protect the toolholder pocket from wear, and provide a stable seating surface when inserts are indexed or replaced. This shim follows the IVSN style and is sized for a 3/8 inch (0.3750 inch decimal) inscribed circle. It is compatible with diamond-shaped inserts. Installation is performed by machinists and toolroom technicians during routine insert changes or toolholder refurbishment.

This shim is intended for use in turning applications on CNC lathes and manual turning centers. It fits MVVNN and MVJNL/MVJNR style toolholders in both modular and straight-shank configurations. Typical use is in production and job-shop turning environments where insert pocket longevity and consistent cutting geometry are required. The negative rake geometry suits applications where insert stability and edge strength take priority over cutting force reduction.

Key Features

• IVSN shim style with negative rake geometry for stable insert seating
• 3/8 inch inscribed circle (0.3750 inch decimal) fits standard diamond inserts
• Compatible with MVVNN and MVJNL/MVJNR series toolholder styles
• Protects toolholder pocket from direct insert contact and wear
• Sold individually per package; minimum order quantity is 2 units

Compatibility

Verified compatible toolholders include: C4 MVJNL-27050-16, IM50 MVJNL-16, IM50 MVJNR-16, IM50 MVVNN-16, IM63 MVJNL-16, IM63 MVJNR-16, IM63 MVVNN-16, MVJNL 12-3, MVJNR 12-3, and MVJNR 16-3. Compatible insert shape is diamond with a 3/8 inch inscribed circle.

Installation Notes

This shim is installed by machinists or toolroom technicians during insert indexing or replacement. Before servicing, ensure the machine spindle is fully stopped, locked out, and the turret is in a safe position per shop lockout/tagout procedures. Use the appropriate torx or hex key specified by the toolholder manufacturer for the clamping screw. Inspect the pocket and shim seating surface for chips or debris before reinstalling to maintain cutting geometry.