S-91253A198 8-32 x 7/8" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, prolonging service life in harsh industrial environments without compromising structural integrity.
• Hex drive design allows for high-torque installation with standard tools, speeding up assembly processes and minimizing strip-out risks.
• Fully threaded shank ensures consistent engagement along the entire length, improving load distribution and holding power in varied material thicknesses.
• 82° countersink angle facilitates a flush, low-profile fit, ideal for applications where surface smoothness and aerodynamic profiles are essential.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to rigorous industry standards, supporting safe and sustainable procurement for global supply chains.

Professional Applications & Engineering Value

Engineered for precision and durability, these 8-32 UNC flat head screws address common industrial challenges such as vibration loosening and corrosion-induced degradation. The Black-Oxide Alloy Steel construction, combined with a Class 3A thread fit, ensures secure fastening in high-vibration environments like automotive assemblies, machinery frames, and electronic enclosures. The coarse thread spacing and fully threaded design enable quick installation and robust performance in materials ranging from metals to composites, reducing assembly time and maintenance needs. Ideal for applications requiring flush mounting and reliable tensile strength, these screws deliver consistent performance in OEM manufacturing, aerospace components, and heavy-duty equipment where ASTM F835 compliance is critical for quality assurance.

Specification Summary & Compliance

This screw features a Class 3A thread fit with UNC coarse threading and precise dimensions, including a 7/8" length and 0.164" thread diameter, ensuring accurate alignment and secure fastening. Manufactured to meet ASTM F835 specifications for mechanical properties, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmentally responsible sourcing for industrial applications.