S-91253A362 5/16"-24 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with black-oxide coating for prolonged service life in harsh industrial environments
- Superior tensile strength of 130,000 psi ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal play
- Optimized 82° countersink angle allows for flush mounting in standard countersunk applications
- Hex drive design enables high-torque installation without cam-out for efficient assembly
- Fine UNF threading delivers enhanced grip and load distribution in critical connections
- Partial threading configuration combines secure thread engagement with unthreaded shank strength
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this black-oxide alloy steel flat head screw addresses critical fastening challenges where corrosion resistance and structural integrity are paramount. The 5/16"-24 UNF fine threading provides superior holding power in materials prone to vibration loosening, while the Rockwell C39 hardness ensures consistent performance without deformation under repeated stress cycles. The partially threaded design offers optimal clamping force distribution, making it ideal for precision machinery, heavy equipment assembly, and structural frameworks requiring reliable Class 3A thread fit accuracy. The 82° countersink angle ensures seamless integration with standard countersunk holes, maintaining surface integrity in automotive, aerospace, and manufacturing applications where flush mounting is essential.
Specification Summary & Compliance
Manufactured to ASTM F835 specifications with precision Class 3A thread fit tolerances and UNF fine threading standards. This 2 1/2" flat head screw features 5/16"-24 thread size with 3/16" hex drive compatibility. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
