S-91864A028 4-40 x 9/16" 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 industrial environments, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding conditions.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- Hex socket drive design allows for easy installation with standard tools, minimizing assembly time and improving efficiency.
- Fully threaded shank offers consistent gripping power along the entire length, enhancing load distribution and joint integrity.
- Compliance with ASTM A574 guarantees material quality and manufacturing consistency for dependable fastening solutions.
- RoHS 3 and REACH environmental compliance ensures safe usage without hazardous substances, meeting global regulatory standards.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw with 4-40 UNC coarse threads is engineered to address common industrial challenges such as vibration loosening and corrosion in machinery, automotive, and aerospace assemblies. The Class 3A thread fit ensures minimal backlash, providing a secure connection that withstands dynamic loads. Its hex drive compatibility simplifies maintenance in confined spaces, while the high tensile strength and Rockwell C37 hardness prevent stripping and deformation under pressure. Ideal for applications requiring robust, fully threaded fasteners, it delivers long-term reliability and reduces downtime in industrial screw systems.
Specification Summary & Compliance
This screw adheres to inch system dimensions with a Class 3A thread fit and UNC coarse thread profile, ensuring precise alignment and ease of assembly. Manufactured in compliance with ASTM A574 specifications, it meets stringent quality standards for material and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its safety for use in regulated environments without harmful substances.
