S-91255A019 2-56 x 1" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Superior load-bearing capacity from 120,000 psi tensile strength, ideal for high-stress assembly applications.
• Precise, reliable fastening ensured by Class 3A thread fit, minimizing the risk of loosening under vibration.
• Enhanced durability and wear resistance due to Rockwell C39 hardness, maintaining performance over repeated use.
• Easy installation and removal with 0.050" hex drive, providing secure tool engagement and reducing assembly time.
• Broad compatibility with UNC coarse threading and right-hand direction, suitable for standard industrial components.
• Full regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH, ensuring safe and reliable use.

Professional Applications & Engineering Value

Engineered for precision and reliability, these 2-56 UNC thread rounded head screws are crafted from black-oxide alloy steel to resist rust and wear in harsh conditions. The fully threaded design with coarse thread spacing ensures maximum grip and distribution of stress, reducing the risk of strip-out in materials like metals and plastics. With a button head style and hex drive, they offer a low-profile, flush fit and easy torque application, making them ideal for electronics, machinery, and automotive assemblies where space and vibration resistance are critical. Their Class 3A thread fit guarantees tight tolerances, preventing backlash and enhancing structural integrity in dynamic environments.

Specification Summary & Compliance

This screw features a 2-56 UNC thread with Class 3A fit for precise dimensional accuracy, and is manufactured to ASME B18.3 and ASTM F835 standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.