Value Collection 581827BR Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION 581827BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and structural components. It features a 1-8 UNC thread size with an 8.5-inch length under the head and a 3/4-inch hex drive. Manufactured from alloy steel with a black oxide finish, this screw meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for demanding load-bearing and torque-intensive installations. The black oxide coating provides moderate corrosion resistance and reduces light reflection in precision assemblies. Machinists, millwrights, and maintenance technicians are the primary installers of this fastener type.

This socket cap screw is used in industrial machinery, fixturing, jigs, heavy equipment, and structural metalwork where a flush or recessed fastener head is required. The 1-8 UNC coarse thread pitch is well suited for general-purpose steel and iron connections where fast assembly and strong pull-out resistance are priorities. Its partial threading allows for precise clamping force control in bolted joints with defined grip lengths. Common applications include machine bases, press frames, conveyor structures, and custom fabrication builds.

Key Features

• 1-8 UNC coarse thread for strong engagement in steel and iron assemblies
• 8.5-inch length under head accommodates thick stack-ups and long grip lengths
• 3/4-inch hex drive for use with standard hex keys and socket drivers
• Partially threaded shank for controlled clamping in precision bolted joints
• Alloy steel construction meets ASTM A574 for high tensile and yield strength
• Black oxide finish provides moderate corrosion protection and a non-reflective surface

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for industrial machinery and fabrication applications requiring a 1-8 UNC hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 standards.

Installation Notes

Installation should be performed by a qualified machinist, millwright, or maintenance technician using a properly sized 3/4-inch hex key or socket driver. Always ensure mating threads are clean and free of debris before assembly, and verify thread engagement depth meets the requirements of the joint design. Follow applicable torque specifications from the equipment manufacturer or relevant industry standards for ASTM A574 alloy steel socket cap screws. Never exceed the rated tensile strength of the fastener by applying impact tools without proper torque control.