Socket Button Head Cap Screw, 5/16-18 x 3/4", Alloy Steel Black Oxide, Hex Socket Drive - Full Thread, Coarse Thread UNC, 3/16" Allen Key Size (100 Pack)

These 5/16-18 x 3/4" Socket Button Head Cap Screws deliver the precision and reliability demanded in professional engineering applications. Manufactured from heat-treated alloy steel with a black oxide finish, each fastener provides exceptional strength while maintaining the low-profile aesthetic required for modern machinery and equipment design. The button head configuration offers distinct advantages over standard socket cap screws in applications where head height is critical. With a head diameter of 0.500" and height of just 0.188", these fasteners provide a larger bearing surface than socket caps while sitting significantly lower than hex head bolts. This makes them the preferred choice for guarding, enclosures, and any assembly where protruding hardware creates clearance issues or safety concerns. Alloy steel construction ensures mechanical properties exceeding Grade 5 specifications, with minimum tensile strength of 130,000 PSI. The 5/16-18 coarse thread pitch provides faster assembly, better performance in softer materials like aluminum and plastics, and superior resistance to cross-threading compared to fine thread alternatives. Full threading to within one pitch of the head maximizes clamping force regardless of grip length variations. The precision-broached 3/16" hex socket accepts standard Allen keys and hex bits, enabling high-torque installation in confined spaces. Black oxide finishing adds corrosion resistance suitable for indoor environments while reducing glare and providing the professional appearance expected in quality equipment. Each fastener meets dimensional requirements of ASME B18.3 and mechanical property standards per IFI-111. Whether you're building production machinery, assembling aluminum extrusion frames, fabricating custom fixtures, or maintaining industrial equipment, these socket button heads provide the consistent quality and performance your applications demand. Package contains 100 pieces, carefully packaged to prevent damage during shipping. Made to professional standards for engineers who refuse to compromise on fastener quality.

• PRECISE SPECIFICATIONS: 5/16-18 UNC coarse thread, 3/4" length, full thread engagement for maximum holding power in blind holes and thin materials — meets ASME B18.3 dimensional standards
• PREMIUM ALLOY STEEL CONSTRUCTION: Heat-treated medium carbon alloy steel delivers minimum tensile strength of 130,000 PSI and Rockwell hardness of C38-43, outperforming standard Grade 5 fasteners in high-stress applications
• THERMAL BLACK OXIDE FINISH: provides mild corrosion resistance, reduced light reflection, and lubricity for consistent torque-to-tension relationship during assembly. Black Oxide is not a protective finish and will rust if exposed to moisture. Stainless Steel material is recommended for environments with moisture
• BUTTON HEAD DESIGN: Head height of 0.188" and head diameter of 0.500" sits nearly flush while providing larger bearing surface than standard socket caps — ideal for limited-clearance assemblies
• 3/16" HEX SOCKET DRIVE: Deep, precision-broached hexagonal recess allows high torque transmission without cam-out; recommended tightening torque 14.2 ft-lbs with lubrication
• FULL THREAD COVERAGE: Threads extend to within one thread pitch of the head, maximizing grip length in through-hole applications and providing flexibility in joint design
• MANUFACTURED TO IFI-111 STANDARDS: Dimensional accuracy and mechanical properties conform to Industrial Fasteners Institute specifications for socket head cap screws
• VERSATILE ENGINEERING APPLICATIONS: Designed for machinery, fixtures, jigs, tooling, robotics, 80/20 aluminum extrusion assemblies, and equipment requiring frequent disassembly
• QUANTITY PACK OF 100: Bulk packaging ideal for production runs, maintenance inventory, or project builds — each piece individually inspected for thread quality
• COMPATIBLE HARDWARE: Pairs with 5/16-18 hex nuts, 5/16" flat washers (0.344" ID), and taps standard 'F' drill (0.257") for clearance or #8 drill (0.339") for tap holes