S-91253A211 8-32 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
• Partially threaded design with coarse UNC spacing allows for faster installation and improved grip in softer materials, boosting assembly efficiency.
• 82° countersink angle and flat head profile enable a flush, seamless finish that minimizes protrusion and enhances safety in machinery.
• Hex drive (3/32") ensures easy installation with standard tools, reducing assembly time and preventing stripping.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to rigorous quality and environmental standards, supporting sustainable procurement.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial use, these 8-32 UNC flat head screws address common challenges like vibration loosening and material fatigue. The Black-Oxide Alloy Steel construction, combined with a Rockwell C39 hardness, ensures durability in harsh conditions, from machinery assembly to automotive frameworks. The coarse thread spacing and partial threading provide superior holding power in metals and composites, reducing the need for frequent maintenance. Ideal for applications requiring ASTM F835 compliance, these screws deliver consistent performance in environments where precision and reliability are critical, such as in construction equipment or electronic enclosures.

Specification Summary & Compliance

This screw features a Class 3A thread fit for precise tolerances, adhering to UNC standards with a thread size of 8-32 and a minimum thread length of 7/8". Dimensions include a head diameter of 0.359" and a length of 2 1/4". It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable usage.