S-91571A435 7/8"-9 x 2 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
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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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy-duty structural applications
- Superior durability and wear resistance thanks to Rockwell C19 hardness, ensuring long service life under demanding conditions
- Optimized coarse UNC threading provides faster installation and superior resistance to vibration loosening in industrial settings
- Precise Class 2A thread fit guarantees consistent engagement and reliable clamping force in critical assemblies
- Partially threaded design allows for controlled clamping on specific grip lengths while reducing weight and material usage
- Full regulatory compliance with RoHS 3 and REACH environmental standards for safe use in global markets
- Heavy-duty external hex drive enables high-torque installation with standard tools for efficient assembly operations
Professional Applications & Engineering Value
Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws deliver critical performance where failure is not an option. The high-strength steel construction combined with coarse UNC threading provides exceptional resistance to dynamic loads and vibration fatigue common in construction, bridgework, and industrial equipment. The partially threaded design concentrates the fastener's strength where it's needed most, while the external hex drive accommodates high installation torques without stripping. Meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications, these industrial fasteners ensure compatibility with existing structural bolting standards and procedures.
Specification Summary & Compliance
This 7/8"-9 UNC hex head screw features Class 2A thread fit per standard inch fastener tolerances, ensuring proper engagement and consistent performance. Manufactured to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting applications. The fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substances. With 1 1/2" thread length and 1 1/4" grip length, this partially threaded configuration provides optimal load distribution in structural connections.
