S-91355A093 5/16"-18 x 5/8" ASME B18.3, ASTM F835 Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments.
• Superior tensile strength of 120,000 psi ensures reliable performance under high-stress conditions.
• Class 3A thread fit provides precise, secure fastening with minimal risk of loosening.
• Flanged design eliminates the need for separate washers, speeding up assembly and reducing parts count.
• Hex drive (3/16") allows for easy installation with standard tools, improving efficiency.
• Coarse UNC threads enable quick engagement and strong holding power in various materials.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures safety, quality, and environmental standards are met.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex drive screw is engineered with black-oxide alloy steel to combat rust and wear in demanding settings like machinery assembly, automotive systems, and structural frameworks. Its fully threaded, flanged design distributes load evenly, preventing surface damage and reducing vibration-induced failures. The Class 3A thread fit and coarse thread spacing ensure rapid, secure installations, cutting downtime in high-volume production. With a Rockwell C39 hardness and robust construction, it addresses common issues like stripping and fatigue, making it a dependable choice for industrial applications requiring longevity and precision.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, with dimensions including a 5/8" length and 0.313" thread diameter. It adheres to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality assurance.