S-91286A275 7/16"-14 x 2 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 capacity with 150,000 psi tensile strength, ideal for high-stress industrial assemblies.
- Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh environments.
- High hardness rating of Rockwell C33 ensures minimal wear and deformation under heavy use.
- Reliable coarse UNC threading with Class 2A fit for quick installation and secure fastening in coarse-grained materials.
- Partially threaded design allows for precise clamping force control and vibration resistance in joint assemblies.
- External hex drive and hex head enable high-torque application with standard tools, reducing installation time.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors where high tensile strength and durability are paramount. The steel material combined with zinc-flake coating offers robust protection against rust and chemical exposure, making it suitable for outdoor or corrosive environments. Its 7/16"-14 UNC coarse thread and partial threading provide enhanced grip and reduce the risk of loosening under dynamic loads, while the external hex drive facilitates efficient installation in confined spaces. By meeting ASME B18.2.1 and SAE J429 specifications, it ensures reliable performance in structural fastening applications, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread profile, ensuring consistent engagement and interchangeability. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications for Grade 8 fasteners, guaranteeing mechanical properties such as tensile strength and hardness. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
