Onsrud 91-130 Insert Screw M4 Thread Indexable

Product Description

The ONSRUD 91-130 is an M4 thread insert screw designed for indexable cutting tools. It secures replaceable carbide inserts to the toolholder body, maintaining precise insert positioning during face milling and shell milling operations. Licensed machinists and toolroom technicians install this hardware as part of routine insert changes on indexable toolholders. At 0.25 pounds, it is a lightweight but critical component that keeps inserts locked under cutting loads. Proper screw condition directly affects insert seating and machined surface quality.

This insert screw is suited for use in face mill and shell mill indexable toolholder setups in both production and job-shop machining environments. It is intended for toolholders requiring M4 thread hardware and is compatible with specific ONSRUD toolholder styles and insert series listed in the compatibility section below. Typical applications include CNC milling centers and manual milling machines where indexable insert tooling is used for facing, slotting, and profiling operations.

Key Features

• M4 thread size for secure insert clamping on indexable toolholders
• Compatible with Face and Shell Mill indexable tool types
• Designed to work with ONSRUD 91-series toolholder styles
• Mates with 91-125 and 91-127 insert series
• Lightweight at 0.25 pounds for easy handling during insert changes

Compatibility

Compatible with ONSRUD toolholder styles 91-000, 91-102, 91-104, 91-106, 91-108, 91-112, and 91-114. Designed for use with 91-125 and 91-127 complete inserts. Intended for Face and Shell Mill indexable tool configurations.

Installation Notes

Insert screw installation and replacement is performed by machinists or toolroom technicians during scheduled insert indexing or changeover. Disengage the machine spindle and confirm the machine is in a safe, powered-down state before handling toolholder hardware. Use the correct T-handle or hex key driver sized for M4 insert screws to avoid cam-out or screw damage. Inspect the screw threads and toolholder pocket threads for wear or contamination before reinstalling to ensure proper insert seating.