S-91571A417 5/8"-11 x 3 3/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress structural applications
- Exceptional durability achieved through Rockwell C19 hardness, resisting deformation under heavy loads
- Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring secure fastening and vibration resistance
- Easy installation and removal with standard external hex drive and 1 1/16" head width for common tool compatibility
- Precise load distribution through 2 1/2" grip length and partial threading design for controlled clamping force
- Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality and reliability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable industrial applications
Professional Applications & Engineering Value
This Grade A325 hex head screw delivers critical engineering solutions for heavy-duty structural connections where failure is not an option. The steel construction combined with 120,000 psi tensile strength provides exceptional resistance to dynamic loads and vibration fatigue, making it ideal for construction frameworks, bridge assemblies, and industrial machinery. The UNC coarse thread design ensures rapid installation while maintaining superior pull-out resistance in various materials. With partial threading and precise 2 1/2" grip length, engineers achieve optimal clamp load distribution without thread interference in shear planes. The external hex drive accommodates standard wrenches for efficient assembly in confined spaces, while the Class 2A thread fit guarantees consistent performance across production runs.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit tolerance per UNC standards with precise 5/8"-11 coarse threading. Manufacturing adheres to ASME B18.2.6 dimensional specifications and ASTM A325/ASTM F3125 material and mechanical property requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets.
