S-91255A639 3/8"-24 x 3/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional strength-to-weight ratio with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by black-oxide coating on alloy steel for extended service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
• Optimized drive efficiency through 7/32" hex drive design for easy installation and high torque transmission
• Enhanced durability with Rockwell C39 hardness maintaining structural integrity under repeated stress
• Versatile rounded button head profile offering low-profile installation and reduced snagging risks
• Full thread coverage providing consistent clamping force along the entire fastener length

Professional Applications & Engineering Value

This black-oxide alloy steel rounded head hex screw delivers exceptional engineering value for industrial applications requiring high-strength fastening solutions. The UNF fine thread configuration (3/8"-24) combined with Class 3A thread fit ensures precise engagement in critical assemblies where vibration resistance and reliable clamping force are paramount. The fully threaded design provides uniform stress distribution, while the rounded button head profile minimizes protrusion in confined spaces. Engineered for machinery, automotive components, and heavy equipment applications, this fastener's 120,000 psi tensile strength and corrosion-resistant black-oxide finish address common industrial challenges of mechanical stress and environmental degradation, making it ideal for maintenance, repair, and OEM applications demanding long-term reliability.

Specification Summary & Compliance

This precision-engineered fastener features 3/8"-24 UNF fine threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry requirements for hazardous substance restrictions and chemical safety standards.