S-91286A334 1/2"-13 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 provides long-lasting protection in harsh industrial environments, extending service life.
- High hardness rating (Rockwell C33) offers excellent wear resistance and maintains thread integrity under repeated use.
- Coarse UNC threads enable faster installation and better grip in a variety of materials, improving assembly efficiency.
- Class 2A thread fit ensures consistent, precise engagement with nuts and tapped holes, minimizing cross-threading issues.
- Partially threaded design allows for controlled clamping force and secure fastening in specific joint configurations.
- Compliance with ASME, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade 8 hex head screw combines high-strength steel and a zinc-flake coating to address common industrial challenges like vibration loosening and corrosion. The 1/2"-13 UNC coarse thread and external hex drive facilitate quick, secure installations in heavy machinery, construction equipment, and automotive assemblies, where 150,000 psi tensile strength and Rockwell C33 hardness prevent stripping and deformation. Its partially threaded shank optimizes load distribution, making it ideal for structural connections that require durability and reliability under dynamic loads.
Specification Summary & Compliance
This fastener features a Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It meets ASME B18.2.1 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
