S-91309A537 1/4"-20 x 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
- Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments.
- High tensile strength of 60,000 PSI ensures reliable performance and prevents failure under heavy loads.
- Robust Rockwell B69 hardness provides excellent durability and resistance to wear and deformation.
- Secure and efficient installation with an external hex drive and fully threaded design for maximum grip and ease of use.
- Precise Class 2A thread fit guarantees consistent engagement and reliable fastening in UNC coarse thread applications.
- Compliance with major standards including ASME B18.2.1 and ASTM A307, ensuring quality and interoperability.
- Environmental regulation adherence with RoHS 3 and REACH compliance, making it suitable for regulated industries.
Professional Applications & Engineering Value
This 1/4"-20 UNC Hex Head Screw is engineered to address critical fastening challenges in industrial applications. Constructed from high-grade steel and finished with a protective zinc plating, it combats corrosion effectively, which is essential for machinery and structural assemblies exposed to harsh conditions. The coarse thread design and Class 2A thread fit facilitate quick, secure installation, reducing assembly time and minimizing the risk of cross-threading. With a tensile strength of 60,000 PSI and external hex drive, it provides robust clamping force and easy torque application, making it ideal for heavy-duty equipment, automotive frames, and construction projects where reliability and durability are paramount.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy for consistent fit. It is manufactured in compliance with ASME B18.2.1 and ASTM A307 standards, ensuring high-quality performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, supporting safe and environmentally conscious usage.
