S-91253A367 3/8"-24 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress applications without failure.
• Precise Class 3A thread fit provides tight, secure fastening with minimal risk of loosening or vibration-induced failure.
• 82° countersink angle and flat head design allows for flush mounting, reducing protrusion and improving aesthetic finish.
• Partially threaded shank offers optimal grip and clamping force where full threading isn't required, enhancing assembly efficiency.
• Hex drive (7/32") enables easy installation and high torque application with standard tools, reducing assembly time.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material safety, environmental responsibility, and adherence to global industry standards.

Professional Applications & Engineering Value

This 3/8"-24 UNF flat head screw is engineered from black-oxide alloy steel to address critical challenges in heavy machinery, automotive, and structural assemblies. The fine UNF threading and Class 3A fit deliver superior vibration resistance and sealing capabilities, preventing joint failure in dynamic loads. With a Rockwell C39 hardness and 130,000 psi tensile strength, it withstands extreme mechanical stress, while the partial threading design allows for precise clamp load distribution. Ideal for applications requiring flush surfaces and reliable fastening, this screw ensures long-term durability and compliance with stringent ASTM F835 specifications, making it a trusted choice for engineers seeking performance and regulatory adherence.

Specification Summary & Compliance

This screw features a 3/8"-24 UNF fine thread with Class 3A precision fit, ensuring tight tolerances and reliable engagement. Dimensions include a length of 2 1/2", head diameter of 0.781", and minimal thread length of 1 1/4". Manufactured to ASTM F835 standards, it guarantees consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety regulations without hazardous substances.