S-91253A333 5/16"-24 x 3/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional thread precision with Class 3A fit ensures reliable, vibration-resistant connections in critical assemblies
• High tensile strength (130,000 psi) provides dependable performance under heavy loads and stress conditions
• Optimized countersink design with 82° angle allows for flush mounting and improved aerodynamics in assembled components
• Enhanced driving efficiency with hex drive design prevents cam-out and enables high-torque installation
• Full threading along entire length maximizes grip strength and distributes clamping force evenly
• Industry compliance assurance meets ASME B18.3 and ASTM F835 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

These 5/16"-24 UNF flat head screws deliver critical engineering advantages where precision, strength, and corrosion resistance are paramount. The black-oxide alloy steel construction provides superior protection against oxidation in industrial environments, while the Class 3A thread fit ensures tight tolerances for vibration-prone applications. The 82° countersink angle creates seamless flush mounting in machinery, automotive components, and precision equipment assemblies. With fully threaded design and hex drive compatibility, these fasteners enable efficient installation in confined spaces while maintaining 130,000 psi tensile strength for heavy-duty structural connections. Ideal for aerospace, manufacturing, and automotive applications requiring reliable, high-performance fastening solutions.

Specification Summary & Compliance

Manufactured to Class 3A thread fit precision standards with UNF fine threading (5/16"-24) for superior engagement. Complies with ASME B18.3 dimensional specifications and ASTM F835 performance requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features Rockwell C39 hardness and maintains dimensional accuracy across all critical parameters including head diameter (0.656"), length (3/4"), and drive size (3/16").