S-91253A091 2-64 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures reliable, vibration-resistant connections in fine-thread applications
• High tensile strength of 130,000 psi provides superior load-bearing capacity for demanding assemblies
• Rockwell C39 hardness rating delivers excellent wear resistance and long-term durability
• Standard 82° countersink angle allows for flush mounting in precision-machined components
• Hex drive design (0.050") enables secure installation with standard tools, reducing slippage risks
• Full threading along 1/2" length maximizes engagement depth and clamping force distribution

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws with 2-64 UNF fine threading solve critical challenges in precision assembly where space constraints and vibration resistance are paramount. The Class 3A thread fit maintains tight tolerances in electronic enclosures, aerospace components, and medical devices, preventing loosening under dynamic loads. The 82° countersink angle ensures seamless flush mounting in machined surfaces, while the hex drive system provides reliable torque transmission during installation. Engineered for industrial applications requiring consistent performance, these screws combine high tensile strength with environmental compliance for long-term reliability in regulated sectors.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread fit precision and UNF fine thread standards. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 0.086" thread diameter, 1/2" length, and fully threaded design with Rockwell C39 hardness verification.