Value Collection R57001289 Hex Head Cap Screw 18-8 Ss

Product Description

The VALUE COLLECTION R57001289 is a hex head cap screw designed for heavy-duty fastening in industrial, mechanical, and structural applications. Manufactured from 18-8 stainless steel with an uncoated finish, this fastener delivers solid corrosion resistance across a wide range of service environments. It measures 1-1/8-7 UNC thread size with a 4-inch length under head and features partial threading along the shank. The partially threaded design allows for controlled clamping force and is well suited for applications where the unthreaded grip length needs to bear shear loads or align mating components precisely.

This cap screw is appropriate for use in industrial maintenance, equipment assembly, marine environments, food-processing facilities, and other settings where corrosion resistance is a priority. The 18-8 stainless steel grade performs reliably in mildly corrosive conditions including exposure to moisture, mild acids, and general weathering. Machinists, millwrights, maintenance technicians, and structural assemblers commonly specify this fastener when stainless steel compliance is required by design or facility standards.

Key Features

• 18-8 stainless steel construction provides reliable corrosion resistance in wet and mildly corrosive environments
• 1-1/8-7 UNC thread standard ensures compatibility with standard inch-system tapped holes and nuts
• Partially threaded shank supports precise load distribution and shear resistance in bolted joints
• Uncoated finish eliminates coating thickness variables for tight-tolerance assemblies
• 4-inch length under head accommodates thick or stacked material joints
• Weighs approximately 2 pounds per package quantity

Compatibility

Designed for use in standard inch-system UNC-threaded assemblies requiring a 1-1/8-7 hex head cap screw in stainless steel grade 18-8.

Installation Notes

Installation is typically performed by machinists, millwrights, or qualified maintenance technicians using a hex socket or open-end wrench sized for a 1-1/8-7 fastener. Always verify that the mating tapped hole or nut is rated for the same thread class and material compatibility before assembly. De-energize, depressurize, or otherwise isolate the equipment being serviced before installing or removing fasteners in load-bearing or pressurized assemblies. Apply a compatible anti-seize compound when joining stainless steel fasteners to stainless steel threads to prevent galling during installation or future removal.