Value Collection 307242BR Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION 307242BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1-8 UNC thread size, a 4.5-inch length under head, and a 5/8-inch hex drive. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. It conforms to ASTM A574, the standard specification for alloy steel socket-head cap screws. Machinists, millwrights, and maintenance technicians install this type of fastener where high clamp load and a flush or recessed head profile are required.

This screw is suited for use in heavy equipment, machine bases, die sets, fixtures, and structural brackets where a 1-inch coarse-thread fastener is specified. The partial threading allows the unthreaded shank to provide shear resistance and precise locating in close-tolerance bored holes. The black oxide finish is common in industrial environments where the fastener will be periodically lubricated or where a non-reflective appearance is preferred over a bright finish.

Key Features

• 1-8 UNC thread form — coarse pitch for fast engagement and resistance to cross-threading in production environments
• 4.5-inch length under head accommodates thick structural members and stacked components
• Partial threading allows the shank to function as a locating or shear pin in precision bores
• Alloy steel construction provides high tensile and proof-load strength per ASTM A574
• Black oxide coating reduces surface corrosion and minimizes galling during installation
• 5/8-inch hex drive accepts standard hex keys and socket drivers at that size

Compatibility

Designed as a direct-fit replacement or new-installation fastener for any application requiring a 1-8 UNC partially threaded hex socket cap screw conforming to ASTM A574.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 5/8-inch hex key or socket driver. Always clean and inspect the tapped hole before installation, and apply an appropriate thread lubricant or anti-seize compound to achieve consistent clamp load. Power down or de-energize any equipment before accessing fastened assemblies. Do not substitute this fastener in applications specifying a different grade, thread form, or head style without verifying load requirements.