S-91255A011 0-80 x 3/16" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant fastening in critical applications
• High-strength performance with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty mechanical assemblies
• Optimized drive efficiency through hex drive design providing secure tool engagement and reduced cam-out risk
• Space-saving rounded head profile with low-profile button design for applications with clearance limitations
• Fine thread spacing advantage delivering enhanced adjustment precision and superior clamping force distribution
• Full regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

Engineered for precision-critical assemblies, these 0-80 UNF black-oxide alloy steel screws address common industrial challenges where vibration resistance, space constraints, and corrosion protection are paramount. The Class 3A thread fit ensures minimal backlash in precision instruments, electronic enclosures, and aerospace components, while the fine thread spacing provides superior clamping force in thin materials. The hex drive configuration prevents stripping during high-torque installation, making these fully threaded screws ideal for automated assembly systems. The black-oxide surface treatment creates a durable barrier against oxidation without adding significant thickness, maintaining the low-profile rounded head advantage in compact designs across automotive, telecommunications, and industrial machinery sectors.

Specification Summary & Compliance

This precision fastener maintains Class 3A thread fit tolerances per UNF specifications with fine thread spacing and right-hand thread direction. Manufacturing complies with ASME B18.3 and ASTM F835 standards, ensuring dimensional consistency and mechanical performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming restricted substance adherence for global industrial applications.