S-91247A920 1"-8 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi tensile strength, ideal for high-stress industrial assemblies.
- Superior corrosion resistance from zinc plating, extending service life in demanding environments.
- Reliable mechanical performance ensured by Grade 5 steel and Rockwell C25 hardness for consistent durability.
- Easy installation and removal with external hex drive and coarse UNC threads, reducing assembly time.
- Precise thread engagement with Class 2A fit, minimizing cross-threading and ensuring secure fastening.
- Optimized for heavy-duty use through partial threading, providing strong grip where needed without unnecessary weight.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interoperability and safety.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this 1"-8 UNC hex head screw addresses critical needs in construction, machinery, and structural assemblies. The Grade 5 steel composition and zinc plating deliver robust resistance to wear and environmental factors, preventing failure under dynamic loads. Its coarse thread design ensures quick, secure fastening in materials like steel and cast iron, reducing installation errors. With partial threading, it concentrates strength on the engaged section, ideal for joints requiring high clamp force. This external hex drive screw supports standard wrenching tools, streamlining maintenance in confined spaces while meeting rigorous ASME B18.2.1 specifications for dimensional accuracy.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNC standards, ensuring precise alignment. It conforms to ASME B18.2.1 and SAE J429 for mechanical properties and dimensions, with verification of RoHS 3 and REACH compliance for environmental safety. The inch system measurements (e.g., 4" length, 1"-8 thread) guarantee compatibility with North American industrial equipment.
