Kennametal 1130303 Central Lock Screw Indexable Drilling

Product Description

The KENNAMETAL 1130303 is a central lock screw designed to secure indexable inserts in drilling toolholders. This fastener threads directly into the insert pocket of the toolholder, clamping the insert firmly in place during cutting operations. It is a small but critical component — improper or worn lock screws cause insert movement, poor hole quality, and accelerated wear on the pocket seat. Machinists and toolroom technicians working with indexable drilling systems rely on this screw as a standard service and maintenance item. At 0.05 pounds, it is a lightweight steel fastener built to the M5/M4 thread specification.

This central lock screw is intended for indexable drilling applications where insert retention is managed by a single central fastener threaded through the insert face. It is compatible with insert hardware in toolholder systems using the M5/M4 thread interface. Typical use is in production machining environments — CNC turning centers, machining centers, and dedicated drilling stations — where inserts are indexed or replaced at regular intervals. This part ships in a package quantity of 1, with a minimum order quantity of 10 units per order.

Key Features

• Central lock screw design clamps indexable inserts directly through the insert face
• Sized for indexable drilling toolholders using M5/M4 thread interface
• Lightweight at 0.05 pounds for minimal toolholder mass impact
• UNSPSC Code 31161500 for procurement and catalog classification
• Sold individually per package; minimum order quantity of 10 units

Compatibility

Designed as a replacement central lock screw for indexable drilling toolholders that accept insert hardware with an M5/M4 thread specification. Confirm thread size and insert pocket geometry against the toolholder manufacturer documentation before ordering.

Installation Notes

Installation of central lock screws should be performed by a qualified machinist or toolroom technician familiar with indexable tooling systems. Always ensure the toolholder is removed from the spindle and the machine is in a locked-out, de-energized state before servicing inserts or fasteners. Use the correct Torx or hex key driver specified by the toolholder manufacturer — do not overtighten, as this can strip the pocket thread or fracture the insert. Inspect the insert pocket seat and screw threads for wear or contamination before installing a new screw.