Iscar 5520066 Indexable Turning Shim Tdn 0.5 Inch

Product Description

The ISCAR 5520066 is a TDN-series shim designed for indexable turning toolholders. Shims seat beneath the cutting insert in the toolholder pocket, ensuring correct insert height, protecting the pocket floor from wear, and maintaining consistent cutting geometry over multiple insert changes. This shim carries a negative rake geometry and accommodates both left-hand and right-hand cutting directions. It is sized for a 0.5-inch (1/2 inch) inscribed circle, matching diamond-shaped inserts used in external turning operations. Installation requires no special tooling beyond standard insert-change procedures. Machinists and toolroom technicians working with PDJNR/L-style toolholders will find this a direct-fit replacement shim.

The 5520066 is intended for use in external turning applications on CNC lathes and manual turning centers. It is compatible with a specific range of PDJNR/L and DDUNR/L toolholder bodies, as well as select S32T and S40U shank-style holders. The TDN shim style positions a diamond-shaped insert at the correct seating depth for negative-rake cutting. Typical applications include general-purpose turning on ferrous and non-ferrous materials where the PDJNR/L toolholder family is the standard setup.

Key Features

• TDN shim style for diamond-shaped indexable inserts with 0.5-inch inscribed circle
• Negative rake geometry maintains correct insert presentation angle
• Supports both left-hand and right-hand cutting directions in a single part
• Compatible with PDJNR/L and DDUNR/L toolholder families including S32T and S40U shank styles
• Protects toolholder pocket floor from insert-seating wear, extending holder service life
• Lightweight at 0.025 pounds, minimal handling bulk for toolcrib inventory

Compatibility

Verified compatible toolholders include: C6 PDJNR-45065-15-JHP; PDJNL 2020K-15; PDJNL 2525M-15; PDJNL 2525M-15-JHP; PDJNL 3232P-15; PDJNR 2020K-15; PDJNR 2525M-15; PDJNR 2525M-15-JHP; PDJNR 3232P-15; S32T DDUNL-15; S32T DDUNR-15; S32T PDUNL-15; S32T PDUNR-15; S40U DDUNL-15; S40U DDUNR-15. Confirm pocket dimensions against the toolholder documentation before ordering if the holder is not listed above.

Installation Notes

Shim replacement is performed by qualified machinists or toolroom technicians during routine insert changes or after visible pocket-floor damage is noted. Power down or disengage the spindle and ensure the machine is in a safe lockout state before accessing the toolholder pocket. Seat the shim flat in the pocket before placing the insert; verify there is no debris or burring on the pocket floor that would prevent full contact. Follow the toolholder manufacturer torque and clamping sequence for the insert screw to avoid shim displacement during cutting.