S-91257A838 5/8"-18 x 10" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precise torque transmission via external hex drive design and 15/16" head width for secure installation
- Reliable thread engagement with Class 2A thread fit and UNF fine threading for vibration resistance
- Enhanced durability from Rockwell C33 hardness Grade 8 steel construction
- Optimized weight distribution through partial threading design along the 10" length
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value for heavy machinery, structural steel connections, and industrial equipment assembly. The 5/8"-18 UNF fine threading provides superior resistance to vibrational loosening in dynamic load environments, while the zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor or high-moisture applications. The partially threaded design concentrates strength where needed most, making it ideal for applications requiring precise clamp load distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme pressure and shock loads, reducing maintenance frequency and downtime in industrial operations.
Specification Summary & Compliance
Manufactured to exact Class 2A thread fit tolerances with 5/8"-18 UNF fine threading in right-hand direction. The 10" length features partial threading with minimum thread length of 1 3/4". Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining the Grade 8 strength classification throughout the fastener's service life.
