S-91286A383 1/2"-20 x 3 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 tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening, improving installation efficiency and joint integrity.
- High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity through repeated use and vibrations.
- Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip lengths and vibration resistance.
- Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interchangeability, simplifying procurement and inventory management.
- External hex drive and right-hand thread enable easy installation with standard tools, reducing assembly time and labor costs.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade 8 hex head screw combines high-strength steel and a zinc-flake coating to address common industrial challenges like corrosion and mechanical stress. The 1/2"-20 UNF fine thread and Class 2A fit provide precise engagement in critical assemblies, reducing the risk of loosening under dynamic loads. Ideal for heavy machinery, construction equipment, and automotive systems, it ensures long-term reliability by resisting wear and environmental degradation. The partially threaded configuration supports focused clamping in bolted joints, making it a versatile choice for engineers seeking durability and compliance in industrial fasteners.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances per UNF standards, with manufacturing conforming to ASME B18.2.1 and SAE J429 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability in industrial use.
