S-91309A558 1/4"-20 x 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 tensile strength of 60,000 psi provides reliable load-bearing capacity for demanding industrial applications.
- Zinc plating finish offers excellent corrosion resistance, extending the screw's service life in various environments.
- Fully threaded UNC coarse thread design ensures maximum grip and holding power across the entire length.
- External hex drive and hex head allow for easy installation and high torque application with standard tools.
- Class 2A thread fit guarantees consistent, precise engagement with mating components for secure fastening.
- Compliance with ASME B18.2.1 and ASTM A307 ensures adherence to rigorous industrial standards for safety and performance.
- RoHS 3 and REACH compliance confirms environmental responsibility and safe use in regulated markets.
Professional Applications & Engineering Value
This 1/4"-20 x 4" steel hex head screw is engineered to address critical challenges in industrial assembly, such as vibration resistance and structural integrity. The UNC coarse threading and fully threaded design provide enhanced pull-out resistance, making it ideal for heavy machinery, construction frameworks, and automotive components where high tensile strength is paramount. The zinc plating adds a protective layer against rust and corrosion, ensuring durability in humid or outdoor settings. With a Rockwell B69 hardness and external hex drive, it supports efficient installation and long-term reliability, reducing maintenance needs in industrial applications.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and adheres to UNC coarse thread standards with a size of 1/4"-20. It complies with ASME B18.2.1 and ASTM A307 manufacturing specifications, ensuring dimensional accuracy and performance consistency. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental compliance for global industrial use.
