Sumitomo U103387 Negative Lock Pin Indexable Turning

Product Description

The SUMITOMO U103387 is a negative lock pin designed for use with indexable turning toolholders. It serves as a hardware retention component that secures cutting inserts and shims within the toolholder pocket, maintaining precise insert positioning during turning operations. The pin measures 0.516 inches overall length and conforms to the ANSI Combination series standard. It follows the industry standard designation NL34L. Licensed machinists and CNC lathe technicians install this component as part of routine insert changeovers or when replacing worn clamping hardware in indexable turning setups.

This pin is intended for use in indexable turning applications across ANSI Combination series toolholders. It is compatible with toolholder styles MCLN, MDJN, MDPNN, MTAN, MTENNS, MTGN, and MTJN. It works with CL 6, CL 7, CL 12, and CL 30 clamps and is designed for use alongside inserts and shims. Compatible insert geometries include CNMG 32, DNMG 33, and TNMG 32 series inserts. This pin suits both production turning and job shop environments where indexable tooling systems are standard.

Key Features

• Negative lock pin design secures insert and shim stack within the toolholder pocket
• 0.516 inches overall length per ANSI Combination series specification
• Industry standard number NL34L for cross-reference identification
• Compatible with CL 6, CL 7, CL 12, and CL 30 clamps
• Fits MCLN, MDJN, MDPNN, MTAN, MTENNS, MTGN, and MTJN toolholder styles
• Supports CNMG 32, DNMG 33, and TNMG 32 insert families

Compatibility

Compatible with MCLN, MDJN, MDPNN, MTAN, MTENNS, MTGN, and MTJN ANSI Combination series turning toolholders using CL 6, CL 7, CL 12, or CL 30 clamps. Designed for use with inserts and shims, including CNMG 32, DNMG 33, and TNMG 32 series inserts.

Installation Notes

Replacement of clamping hardware on indexable turning toolholders is performed by machining technicians as part of scheduled tooling maintenance or insert changeover procedures. Ensure the machine spindle is fully stopped and the toolholder is removed from the turret before servicing clamping components. Use the appropriate torx or hex key specified by the toolholder manufacturer when removing and reinstalling clamp screws. Inspect the pin seat and clamp body for wear or damage before reinstalling.