Mitsubishi 160303 Indexable Insert Screw M3.5

Product Description

The MITSUBISHI 160303 is a clamping screw designed for indexable insert tooling. It uses an M3.5 thread to secure cutting inserts to the tool body, maintaining precise insert positioning during machining operations. The screw measures 0.453 inches in overall length with a head diameter of 0.209 inches. Licensed machinists and toolroom technicians install these screws as part of routine insert changes on turning, milling, and boring toolholders that use the M3.5 clamp screw standard. The 160303 is a small but critical component — improper or missing screws directly affect insert seating and cut quality.

This screw is used in shops running CNC and manual metal-cutting equipment where indexable insert toolholders require periodic insert replacement. It is appropriate for production environments with high insert turnover, as well as job shops performing toolholder maintenance. The M3.5 thread size is common across a range of indexable toolholder styles. Technicians typically keep a supply on hand to avoid downtime during insert indexing or changeover.

Key Features

• M3.5 thread size for indexable insert clamping
• Overall length of 0.453 inches for compact toolholder pockets
• Head diameter of 0.209 inches for proper seating in countersunk insert pockets
• Lightweight at 0.001 pounds — minimal contribution to tool assembly weight
• UNSPSC Code 31161500 for procurement and catalog classification

Compatibility

Designed as a replacement clamping screw for indexable toolholders requiring an M3.5 thread insert screw. Confirm thread size and head geometry against your specific toolholder specification before ordering.

Installation Notes

Insert screw replacement is performed by qualified machinists or toolroom personnel. Before changing inserts or screws, ensure the machine is powered down, the spindle is locked, and the toolholder is removed from the turret or spindle where possible. Use the correct Torx or hex key driver specified by the toolholder manufacturer — do not substitute driver sizes, as this risks stripping the screw head. Discard any screw showing thread damage, cam-out wear, or deformation rather than reinstalling it.