S-91236A605 5/16"-18 x 5 1/2" 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
- Exceptional tensile strength of 60,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Zinc plating finish provides superior corrosion resistance, extending the screw's service life in various industrial environments.
- Coarse UNC threads offer faster installation and better performance in softer materials or where debris is present.
- External hex drive and hex head design allows for high torque application with standard tools, ensuring secure and efficient fastening.
- Class 2A thread fit guarantees consistent, free-spinning assembly and interchangeability, speeding up production processes.
- Partial threading provides an unthreaded shank for precise clamping and shear strength where needed.
- Compliance with ASME B18.2.1 and ASTM A307 ensures dimensional accuracy and material quality for dependable, standardized use.
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw is engineered to solve critical fastening challenges in industrial applications such as machinery assembly, structural frameworks, and heavy equipment. The steel material with Rockwell B69 hardness provides excellent durability and resistance to deformation under load. Its coarse thread design is ideal for use in materials where fine threads might strip, offering enhanced grip and vibration resistance. The zinc plated finish protects against rust and corrosion, making it suitable for both indoor and outdoor environments. With an external hex drive, it allows for easy installation and removal using common wrenches, reducing labor time and improving operational efficiency in maintenance and construction projects.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in accordance with ASME B18.2.1 and ASTM A307 specifications, ensuring consistent dimensions and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in various markets.
