S-91253A405 12-24 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Exceptional tensile strength (130,000 PSI) ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal backlash
• 82° countersink angle design enables flush mounting for clean, professional finishes
• Full threading along entire shank allows maximum grip and adjustment flexibility
• Hex drive compatibility delivers superior torque transmission during installation
• Rockwell C39 hardness rating maintains thread integrity through repeated use cycles

Professional Applications & Engineering Value

These 12-24 UNC flat head screws solve critical fastening challenges in industrial assembly where vibration resistance and corrosion protection are paramount. The black-oxide alloy steel construction provides superior protection against environmental degradation while maintaining 130,000 PSI tensile strength for heavy-duty applications. The coarse UNC threads and Class 3A fit ensure rapid installation with exceptional holding power in metals and engineered plastics. The 82° countersink angle creates seamless transitions in precision-machined components, making these hex drive screws ideal for automotive, machinery, and electrical enclosure applications requiring reliable, flush-mounted fasteners.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 3A thread tolerance for precision fit. Complies with ASTM F835 mechanical properties and surface treatment requirements. Meets environmental standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features right-hand UNC coarse threads with full threading along the 1/2" length, ensuring consistent performance across industrial applications.