S-91247A508 7/8"-14 x 3 1/2" 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 due to zinc plating, extending service life in harsh environments.
- Reliable thread engagement with 7/8"-14 UNF fine threading and Class 2A fit, ensuring precise, vibration-resistant connections.
- Optimized for heavy-duty applications featuring a Grade 5 strength rating and Rockwell C25 hardness for consistent performance under pressure.
- Easy installation and removal with an external hex drive and hex head design, allowing for high torque application with standard tools.
- Controlled thread length through partial threading, providing unthreaded shank strength where needed for structural integrity.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and reliability.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade 5 hex head screw delivers robust performance in machinery, construction, and heavy equipment. The zinc plated steel finish combats oxidation, reducing maintenance in outdoor or humid settings. Its 7/8"-14 UNF fine thread and partial threading enhance grip in tapped holes and resist loosening under dynamic loads. The external hex drive facilitates quick assembly with common wrenches, streamlining production. Ideal for structural frames, industrial mounts, and automotive applications, it addresses the need for durable, high-strength fasteners that maintain integrity over time.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances for consistent engagement and is manufactured per ASME B18.2.1 and SAE J429 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety. With a 3 1/2" length, min. 2" thread length, and inch system measurements, it guarantees precision in industrial fastener systems.
