S-91864A089 3-48 x 5/16" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tight tolerances for secure, vibration-resistant assemblies in critical machinery.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- Fully threaded design allows for maximum grip and uniform load distribution along the entire length, improving joint integrity.
- Hex socket drive (5/64") enables easy installation with standard tools, minimizing assembly time and reducing the chance of stripping.
- Rockwell C37 hardness ensures excellent durability and wear resistance, maintaining thread integrity through repeated use.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chain requirements.
Professional Applications & Engineering Value
This 3-48 UNC socket head cap screw is engineered from black-oxide alloy steel to address common industrial challenges such as vibration loosening and corrosion in demanding settings. Its coarse thread and Class 3A fit provide exceptional holding power in materials like metals and composites, making it ideal for precision equipment, automotive assemblies, and machinery where reliability is critical. The combination of high tensile strength and full threading ensures even stress distribution, reducing the risk of fatigue failures. With a standard socket head profile and right-hand thread, it simplifies maintenance and disassembly, enhancing operational efficiency in industrial fastening applications.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including UNC thread type with Class 3A thread fit for tight tolerance control. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring material and manufacturing consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and regulatory requirements in global markets.
