S-91286A610 5/16"-18 x 5/8" 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 from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C33) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Fully threaded UNC coarse spacing allows for faster installation and better grip in a wide range of materials, improving assembly efficiency.
- Class 2A thread fit ensures consistent, reliable engagement with nuts and tapped holes, reducing cross-threading and rework.
- External hex drive design offers easy access for standard tools, enabling quick and secure tightening in confined spaces.
- Compliance with ASME, SAE, RoHS, and REACH guarantees adherence to industry standards and environmental regulations, ensuring safe and approved use.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction, and automotive applications. Made from high-strength steel and featuring a zinc-flake coating, it combats corrosion and wear, prolonging fastener life in demanding conditions. The UNC coarse thread and fully threaded design provide superior holding power and ease of installation, reducing labor time and preventing loosening under vibration. With a right-hand thread and precise Class 2A fit, it ensures secure, repeatable fastening, making it ideal for applications requiring dependable, high-tensile connections that meet rigorous ASME B18.2.1 and SAE J429 standards.
Specification Summary & Compliance
This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC coarse thread spacing, ensuring compatibility and performance. It meets manufacturing specifications under ASME B18.2.1 and SAE J429 for Grade 8 strength. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free from hazardous substances and suitable for regulated industrial use.
