S-91247A364 1/2"-20 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 120,000 psi ensures reliable performance in high-stress industrial applications, reducing failure risks.
- Zinc plating provides superior corrosion resistance, extending service life in harsh environments and minimizing maintenance needs.
- Grade 5 classification and Rockwell C25 hardness offer excellent durability and wear resistance for repeated use in demanding assemblies.
- Fine UNF threads with Class 2A fit deliver precise, secure fastening with reduced vibration loosening in machinery and equipment.
- Partially threaded design allows for controlled clamping force and easier alignment in structural and automotive applications.
- External hex drive and standard head dimensions enable quick installation and removal with common tools, boosting efficiency.
- Compliance with ASME, RoHS 3, and REACH standards ensures safety, environmental responsibility, and global regulatory acceptance.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industries, such as construction, automotive, and machinery manufacturing. The zinc-plated steel construction combats corrosion, prolonging fastener integrity in outdoor or humid conditions. With a 1/2"-20 UNF fine thread and Class 2A fit, it provides superior resistance to vibration and shock, preventing loosening in dynamic loads. The partially threaded shank allows for optimal stress distribution, making it ideal for bolted joints requiring precise tension control. By meeting ASME B18.2.1 specifications, it ensures interchangeability and reliability, reducing downtime and maintenance costs in professional settings.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNF fine thread standards for consistent performance. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use.
