S-91268A219 1 1/4"-7 x 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 durability and wear resistance from Rockwell C33 hardness, reducing maintenance needs and extending service life.
- Easy installation and removal with external hex drive and coarse UNC threads, providing quick assembly in industrial settings.
- Precise thread fit for secure fastening with Class 2A thread fit, minimizing loosening under vibration and stress.
- Optimized load distribution through partial threading design, enhancing grip and stability in structural connections.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, supporting sustainable procurement practices.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and corrosion resistance are paramount. The 1 1/4"-7 UNC coarse thread and external hex drive enable rapid installation in high-vibration environments, reducing downtime. Made from robust steel and featuring a partially threaded shank, it concentrates stress efficiently to prevent joint failure. Ideal for bolting flanges, structural frames, and equipment bases, this screw meets ASME B18.2.1 specifications, delivering reliable performance in industrial applications that demand longevity and safety.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse threading per inch standards. It conforms to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring mechanical integrity. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming the absence of hazardous substances for safe use in global markets.
