S-91355A083 1/4"-20 x 1" ASME B18.3, ASTM F835 Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for prolonged service life in harsh industrial environments
• Superior load-bearing capability with 120,000 psi tensile strength to withstand high-stress applications
• Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Enhanced torque transmission through 5/32" hex drive design for reliable installation and removal
• Optimized flange distribution provides wider bearing surface to prevent material damage and loosening
• Full-threaded UNC coarse spacing enables faster installation and superior holding power in various materials
• Industry compliance assurance with ASME B18.3 standards and environmental regulations for global project acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel rounded head screws deliver exceptional performance in machinery assembly, automotive components, and heavy equipment manufacturing. The Rockwell C39 hardness rating combined with 120,000 psi tensile strength provides reliable fastening under extreme mechanical stress, while the flanged design distributes clamping force evenly to prevent surface damage. The UNC coarse thread spacing ensures quick installation in steel, aluminum, and composite materials, making these hex drive screws ideal for production lines requiring efficiency and durability. The black-oxide surface treatment offers superior corrosion protection, extending service life in challenging environments where moisture and chemicals are present.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread spacing (1/4"-20), these screws comply with ASME B18.3 manufacturing specifications. The fully threaded design maintains consistent engagement depth, while the 0.563" flange diameter provides optimal load distribution. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring suitability for global industrial applications requiring strict regulatory adherence.