S-91286A317 1/2"-13 x 3/4" 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loads.
- Coarse UNC threads offer faster assembly and better grip in soft materials, improving installation efficiency.
- Full threading along the 3/4" length allows for maximum adjustability and secure fastening in varied material thicknesses.
- External hex drive design enables easy installation and removal with standard tools, reducing labor time.
- Compliance with industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in mechanical systems.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for demanding industrial applications where high tensile strength and corrosion resistance are critical. The steel construction with zinc-flake coating provides robust protection against rust and chemical exposure, making it ideal for machinery, construction, and automotive assemblies. Its 1/2"-13 UNC coarse threads and Class 2A thread fit ensure precise engagement and vibration resistance, addressing common issues like loosening under dynamic loads. By meeting ASME B18.2.1 and SAE J429 specifications, this fastener delivers reliable performance in heavy-duty bolting applications, reducing downtime and maintenance costs.
Specification Summary & Compliance
This hex head screw features a 1/2"-13 UNC coarse thread with Class 2A tolerance for consistent fit and performance. It complies with ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional accuracy and mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
