S-91268A813 5/8"-11 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
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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 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring long service life under demanding conditions
- Optimized coarse UNC threading provides faster installation and better vibration resistance in structural assemblies
- Precision Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks during assembly
- Heavy-duty Grade 8 certification delivers proven mechanical properties for critical industrial applications
- External hex drive design enables high-torque installation with standard tools while preventing head stripping
- Partial threading configuration concentrates strength where needed most while reducing material usage
Professional Applications & Engineering Value
Engineered for heavy machinery, structural steel connections, and industrial equipment assembly, this Grade 8 hex head screw addresses critical challenges in high-vibration environments. The 5/8"-11 UNC coarse thread profile maintains secure fastening under dynamic loads, while the 150,000 psi tensile strength provides a substantial safety margin for load-critical applications. The external hex drive accommodates high installation torque without deformation, and the partial threading design optimizes clamp force distribution. Manufactured from high-strength steel with Rockwell C33 hardness, these screws resist wear in repetitive disassembly scenarios common in maintenance operations.
Specification Summary & Compliance
This fastener maintains Class 2A thread tolerances per UNC standards with precise 5/8"-11 coarse threading and 2 1/2" length. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements for industrial use, providing environmental regulatory assurance for global supply chains.
