S-91255A012 0-80 x 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for longevity in harsh industrial environments
• Superior thread engagement with Class 3A precision fit ensuring reliable, vibration-resistant fastening
• High tensile strength (120,000 psi) for demanding applications requiring maximum load-bearing capacity
• Optimized drive efficiency with hex drive design providing secure tool engagement and reduced cam-out risk
• Enhanced durability through Rockwell C39 hardness maintaining structural integrity under repeated stress
• Versatile fine threading (UNF 0-80) delivering superior holding power in thin materials and precision assemblies
• Regulatory compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These black-oxide alloy steel button head screws address critical engineering challenges in precision manufacturing and heavy-duty applications. The UNF fine threading combined with Class 3A thread fit prevents loosening in high-vibration environments while enabling precise torque control. The fully threaded design ensures consistent clamping force across the entire fastener length, making them ideal for electronics enclosures, aerospace components, and automotive assemblies where space constraints and material thickness vary. The corrosion-resistant black-oxide finish extends service life in humid or chemically exposed conditions, while the rounded button head profile provides a flush finish that eliminates snagging hazards in moving machinery.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread fit ensuring precise dimensional accuracy. The 0-80 UNF fine thread maintains consistent pitch diameter and lead accuracy for reliable mating with corresponding nuts and tapped holes. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across international markets. The combination of Rockwell C39 hardness and 120,000 psi tensile strength validates mechanical performance for critical fastening applications.