S-91257A548 1/4"-20 x 1 3/4" 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 load-bearing capacity with a tensile strength of 150,000 psi, ideal for high-stress structural and machinery applications.
- Superior corrosion resistance due to the zinc yellow-chromate plating, extending service life in harsh environments.
- Reliable fastening performance from the UNC coarse thread and Class 2A fit, ensuring easy installation and vibration resistance.
- High durability and wear resistance with Rockwell C33 hardness, minimizing deformation under heavy loads.
- Secure torque application enabled by the external hex drive and hex head design, allowing for efficient tightening with standard tools.
- Optimized thread engagement through partial threading, providing strong grip while reducing material usage and weight.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and interoperability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in industrial and construction settings, where high tensile strength and corrosion resistance are paramount. The steel material combined with zinc yellow-chromate plating provides a robust barrier against rust and chemical exposure, making it suitable for outdoor equipment, automotive assemblies, and heavy machinery. The 1/4"-20 UNC coarse thread and partial threading design enhance grip in materials like metal and hardwood, reducing the risk of stripping and ensuring long-term stability. By meeting rigorous standards such as ASME B18.2.1, it delivers reliable performance in demanding applications, from structural frameworks to industrial maintenance, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC coarse thread specifications, ensuring dimensional accuracy and ease of assembly. It complies with ASME B18.2.1 and SAE J429 manufacturing standards, and is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global supply chains.
