S-91255A616 3/8"-16 x 1 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• Hex drive design (7/32") allows for easy installation with standard tools, enabling efficient assembly and high torque transmission without slippage.
• Fully threaded coarse UNC pattern ensures rapid engagement and strong holding power, ideal for quick assembly in structural and heavy-duty applications.
• Rounded button head profile offers a low-profile, aesthetically clean finish while reducing snagging risks in exposed fastener locations.
• High hardness (Rockwell C39) enhances wear resistance, maintaining thread integrity and durability through repeated use and adjustments.

Professional Applications & Engineering Value

Engineered for industrial and construction settings, this 3/8"-16 UNC Class 3A rounded head screw addresses common challenges like vibration-induced loosening and corrosion in heavy machinery, automotive assemblies, and structural frameworks. The black-oxide alloy steel construction provides a protective layer against moisture and chemicals, while the coarse thread design ensures quick, secure fastening in materials where fine threads might strip. With a fully threaded body and hex drive, it delivers consistent clamping force and ease of installation, reducing assembly time and maintenance needs in high-tensile applications. Ideal for use in equipment requiring reliable, long-lasting fasteners that meet rigorous engineering standards, this screw minimizes downtime and enhances operational safety.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with dimensions including a 1 5/8" length and 3/8"-16 coarse thread. It complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use.