S-91255A129 5-44 x 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from black-oxide coating, ideal for harsh industrial environments
• Superior thread engagement with Class 3A UNF fine threads ensuring precise, vibration-resistant connections
• High tensile strength rating of 120,000 PSI provides reliable performance under extreme mechanical stress
• Rockwell C39 hardness maintains structural integrity and prevents stripping during installation
• Compact 5/64" hex drive design enables easy installation in confined spaces with standard tools
• Fully threaded construction delivers maximum holding power across the entire 1/4" length
• Compliant with major industry standards including ASME B18.3 and ASTM F835 for guaranteed quality

Professional Applications & Engineering Value

These black-oxide alloy steel screws solve critical challenges in precision assembly applications where space constraints and vibration resistance are paramount. The UNF fine thread configuration with Class 3A tolerance ensures zero backlash in electronic enclosures, aerospace components, and medical devices. The rounded button head profile provides a low-profile finish while the 5/64" hex drive accommodates tight clearance requirements. Engineered for high-stress environments, these fasteners maintain clamping force in automotive subsystems and industrial machinery where thermal cycling and dynamic loads would compromise inferior fasteners.

Specification Summary & Compliance

Manufactured to Class 3A thread fit with UNF fine thread specifications (5-44), these screws deliver precision dimensional accuracy. Compliance with ASME B18.3 and ASTM F835 manufacturing standards ensures consistent quality. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, making them suitable for global supply chains and regulated industries.