S-91236A807 5/8"-11 x 3 1/4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength 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
- Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Class 2A thread fit provides consistent, secure fastening with standard UNC coarse threads for easier assembly
- Rockwell B69 hardness offers excellent durability and resistance to wear during repeated use
- Partial threading design allows for controlled clamping force and improved joint stability
- External hex drive and hex head enable quick installation and high torque application with common tools
- Compliance with ASME B18.2.1 and ASTM A307 guarantees dimensional accuracy and material quality for engineering applications
Professional Applications & Engineering Value
This 5/8"-11 UNC hex head screw is engineered to address common industrial fastening challenges, such as structural integrity and environmental exposure. The steel construction combined with zinc plating provides a robust barrier against rust and corrosion, making it ideal for outdoor machinery, construction frameworks, and manufacturing equipment. Its coarse thread and partial threading enhance grip in softer materials and prevent over-tightening, reducing the risk of thread stripping. With a right-hand thread direction and external hex drive, it ensures efficient installation in high-volume assembly lines, supporting maintenance efficiency and long-term reliability in heavy-duty applications.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit and UNC coarse thread standards, ensuring precise dimensional tolerances for consistent performance. It meets ASME B18.2.1 and ASTM A307 specifications for material and manufacturing quality. Additionally, it is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its safety and environmental responsibility for global industrial use.
