S-91583A208 7/8"-9 x 2 1/2" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Hot-dipped galvanized steel coating provides a robust barrier against rust and environmental degradation, ensuring long-term reliability in harsh conditions.
• High Tensile Strength for Demanding Applications: Rated at 120,000 PSI tensile strength, this screw is engineered to handle extreme structural loads without failure.
• Superior Thread Engagement: Class 2A thread fit ensures consistent, reliable fastening with reduced risk of cross-threading in coarse UNC threads.
• Optimized Load Distribution: The 1" grip length and partially threaded design concentrate clamping force where it's needed most, enhancing joint integrity.
• Industry-Standard Compliance: Manufactured to meet ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, guaranteeing interchangeability and performance consistency.
• Enhanced Durability: Rockwell C19 hardness provides excellent wear resistance, maintaining structural integrity under repetitive stress.
• Environmental & Regulatory Safety: RoHS 3 and REACH compliant, ensuring safe use in regulated industries and global markets.

Professional Applications & Engineering Value

Engineered for heavy-duty structural applications, these Grade A325 hex head screws solve critical fastening challenges in construction, bridgework, and industrial machinery. The hot-dipped galvanized steel construction offers superior corrosion resistance, essential for outdoor or high-moisture environments, while the coarse UNC thread facilitates quick installation and reduces galling. The partially threaded design with a precise 1" grip length ensures that clamping force is optimally applied to the joint, preventing loosening under vibration and dynamic loads. With a 120,000 PSI tensile strength and external hex drive for high-torque application, these screws provide reliable, long-lasting connections in critical structural frameworks, reducing maintenance costs and enhancing safety.

Specification Summary & Compliance

This screw features Class 2A thread fit for consistent assembly tolerance, 7/8"-9 UNC coarse threads per ASME standards, and a 2 1/2" length with 1 1/2" thread length. It complies with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications, ensuring dimensional accuracy and mechanical performance. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting international environmental and safety regulations for industrial use.