S-91286A411 5/8"-11 x 3 1/4" 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 strength for heavy loads with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance in demanding applications.
- Superior corrosion resistance from the zinc-flake coating, extending service life in harsh industrial environments.
- High hardness and durability with Rockwell C33 rating, reducing wear and deformation under stress.
- Easy installation and removal thanks to the external hex drive and coarse UNC threading, speeding up assembly processes.
- Precise thread fit with Class 2A tolerance, minimizing the risk of cross-threading and ensuring secure connections.
- Versatile partial threading allowing for adjustable clamping force in various structural setups.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing quality and interoperability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in industrial settings, such as vibration resistance and long-term structural integrity. Made from high-strength steel and featuring a zinc-flake coated finish, it combats corrosion in outdoor or chemically exposed environments, reducing maintenance costs. The coarse UNC threading and partial threading design enable quick, secure fastening in heavy machinery, construction frameworks, and automotive assemblies, where high tensile loads are common. By meeting rigorous standards like ASME B18.2.1, it ensures compatibility and safety, making it ideal for applications demanding reliability under extreme conditions, from manufacturing plants to infrastructure projects.
Specification Summary & Compliance
This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC coarse threading per industry norms. It conforms to ASME B18.2.1 and SAE J429 specifications for consistent quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence in global markets.
