Kennametal 1021791 Indexable Clamp Screw 1/4-28 Hex Socket

Product Description

The KENNAMETAL 1021791 is a clamp screw designed for indexable tooling systems used in milling and turning applications. It features a 1/4-28 thread size and a 1/8 inch hex socket drive, allowing precise tightening of indexable insert clamps on cutting tool bodies. At 0.013 pounds per unit, it is a compact, lightweight fastener built to maintain insert security under the cutting forces generated during metal removal operations. Machinists and toolroom technicians rely on this type of screw to keep inserts locked in position and to simplify insert changes without disturbing the tool body setup.

This screw is intended for use in indexable milling and turning toolholders that use a clamp-style insert retention system. It is suited for production machining environments where fast, repeatable insert indexing is required. The 1/4-28 unified fine thread provides reliable clamping force in compact tool bodies common in both CNC and manual turning centers, as well as milling arbors and face mills that accept this hardware configuration.

Key Features

• 1/4-28 unified fine thread for secure insert clamp engagement
• 1/8 inch hex socket drive for standard hex key torquing
• Compatible with clamp-style indexable insert retention hardware
• Suitable for both milling and turning indexable tool bodies
• Lightweight at 0.013 pounds per unit
• Sold in a package quantity of 10 units

Compatibility

Designed for use with clamp-style indexable toolholders configured for milling and turning applications that accept a 1/4-28 thread clamp screw with a 1/8 inch hex socket drive. Refer to your toolholder documentation to confirm hardware compatibility before ordering.

Installation Notes

Installation is performed by a machinist or toolroom technician using a calibrated hex key of the correct 1/8 inch size. Always de-energize the machine and confirm the spindle is fully stopped before changing inserts or clamp hardware. Do not exceed the torque specification listed in the toolholder manufacturer documentation, as over-torquing clamp screws can cause thread damage or insert fracture. Inspect the screw threads for wear or damage before each use and replace if any deformation is present.