S-91253A319 1/4"-28 x 2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for industrial environments requiring long-term durability.
• Superior tensile strength of 130,000 psi ensures reliable performance under high-stress applications without failure.
• Precise Class 3A thread fit provides secure, vibration-resistant fastening in critical assemblies.
• Partially threaded design allows for controlled clamping force and reduced risk of cross-threading during installation.
• 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish.
• Hex drive (5/32") compatibility offers easy installation with standard tools, minimizing assembly time.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry safety and environmental standards.

Professional Applications & Engineering Value

These 1/4"-28 UNF flat head screws are engineered from black-oxide alloy steel to address common industrial challenges such as vibration loosening and corrosion in harsh environments. The fine thread spacing and Class 3A thread fit deliver enhanced grip and stability, making them ideal for machinery, automotive, and aerospace applications where precision fastening is critical. The partially threaded configuration allows for optimal load distribution, reducing stress concentrations. With a Rockwell C39 hardness and robust construction, these screws provide long-lasting performance in high-demand settings, ensuring minimal maintenance and downtime.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances and UNF fine thread standards for consistent dimensional accuracy. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.