S-91309A539 1/4"-20 x 5/8" 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 prevents fastener failure.
- Excellent thread engagement and holding power from the fully threaded UNC coarse thread design, ideal for quick assembly.
- Precise Class 2A thread fit guarantees consistent, secure fastening and easy installation with standard tools.
- Durable Rockwell B69 hardness provides robust resistance to wear and deformation during repeated use.
- External hex drive design allows for high torque application and straightforward installation with common wrenches.
- Compliance with major industry standards including ASME B18.2.1, ensuring quality and interchangeability in professional applications.
Professional Applications & Engineering Value
This 1/4"-20 UNC hex head screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and material fatigue. The zinc plated steel construction offers a protective barrier against rust and corrosion, making it suitable for outdoor equipment, machinery, and structural frameworks. Its coarse thread and fully threaded design enhance grip in a variety of materials, reducing the risk of stripping and ensuring long-term stability. By meeting ASME B18.2.1 specifications, it provides reliable performance in high-stress environments, from automotive manufacturing to construction projects, delivering consistent tensile strength and durability that B2B buyers depend on for operational efficiency.
Specification Summary & Compliance
This product features a 1/4"-20 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and ease of assembly. Manufactured in compliance with ASME B18.2.1 and ASTM A307 standards, it ensures consistent quality and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for use in global industrial markets.
