S-92620A279 1 1/4"-12 x 5 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 Capability: With a tensile strength of 150,000 psi and Grade 8 classification, this screw reliably handles extreme stress in heavy machinery and structural applications.
- Superior Corrosion Resistance: Zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh conditions.
- Precise Thread Engagement: UNF fine threads and Class 2A fit ensure tight, secure fastening with reduced risk of loosening under vibration.
- High Durability & Wear Resistance: Rockwell C33 hardness offers excellent resistance to deformation and wear, maintaining integrity through repeated use.
- Optimized for Industrial Use: Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip lengths.
- Broad Regulatory Compliance: Meets ASME B18.2.1 and SAE J429 standards, and is RoHS 3 and REACH compliant, ensuring safety and environmental responsibility.
- Easy Installation & Removal: External hex head design enables quick, tool-friendly tightening with standard wrenches, reducing assembly time.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as construction equipment, automotive assemblies, and machinery frames. Its UNF fine thread configuration and Class 2A thread fit deliver precise alignment and vibration resistance, minimizing maintenance needs in dynamic environments. The zinc yellow-chromate plating combats corrosion effectively, making it suitable for outdoor or high-moisture settings. With a 150,000 psi tensile strength and Rockwell C33 hardness, it prevents fastener failure under extreme loads, ensuring long-term reliability and reducing downtime in demanding operations.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNF fine thread standards, manufactured in compliance with ASME B18.2.1 and SAE J429 specifications. It is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.
