S-91253A203 8-32 x 1 5/8" 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 in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Full threading and 82° countersink angle allow for flush mounting and even load distribution, enhancing structural integrity.
• Hex drive design with 3/32" drive size offers easy installation and high torque transmission, speeding up assembly processes.
• High hardness (Rockwell C39) resists wear and deformation, maintaining fastener integrity through repeated use.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental responsibility.

Professional Applications & Engineering Value

These 8-32 UNC flat head screws are engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in harsh conditions. The black-oxide alloy steel construction provides a durable barrier against moisture and chemicals, while the Class 3A thread fit and coarse thread spacing ensure a secure, tight hold in materials like metal and hardened plastics. Ideal for machinery, automotive, and electronics assemblies, the fully threaded design and 82° countersink angle facilitate smooth, flush installations that distribute stress evenly, reducing the risk of material damage. This combination of high tensile strength and precise engineering makes them a reliable choice for heavy-duty applications where performance and longevity are critical.

Specification Summary & Compliance

This product features precise UNC coarse threads with a Class 3A fit for high-accuracy assemblies, and dimensions include a 1 5/8" length and 0.164" thread diameter. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.