S-91236A595 5/16"-18 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against rust and extends service life in demanding environments
• Exceptional tensile strength rated at 60,000 psi ensures reliable, high-load fastening for industrial applications
• Optimized torque transmission through the external hex drive and hex head design for secure installation with standard tools
• Enhanced durability with Rockwell B69 hardness providing excellent wear resistance and structural integrity
• Reliable thread engagement with UNC coarse threads and Class 2A fit ensuring consistent performance and easy assembly
• Versatile partial threading design allows for both clamping and alignment flexibility in various assembly scenarios
• Full regulatory compliance with RoHS 3 and REACH standards, making them suitable for global industrial supply chains

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 5/16"-18 UNC hex head screws deliver exceptional performance in machinery assembly, structural frameworks, and equipment manufacturing. The steel construction with zinc plating provides crucial corrosion protection in environments exposed to moisture or chemicals, while the 60,000 psi tensile strength ensures joint integrity under significant vibration and load stress. The coarse UNC thread pattern combined with Class 2A thread fit offers superior resistance to loosening and maintains clamping force in dynamic operating conditions. The partially threaded design allows for precise adjustment and secure fastening in applications requiring both threaded and unthreaded engagement zones, making these external hex drive screws ideal for construction, automotive, and industrial maintenance applications where reliability is paramount.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 specifications with material compliance to ASTM A307 standards, these hex head screws feature precise Class 2A thread fit tolerances for consistent performance. The inch-system measurements include 5/16"-18 UNC coarse threads with 0.3125" diameter and 3" length with minimum thread length of 7/8". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures they meet international safety and sustainability requirements for industrial components.