S-91251A368 7/16"-20 x 1 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI for reliable performance in heavy-duty and high-stress applications
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh environments
• Precision Class 3A thread fit ensures tight tolerances and secure fastening, minimizing the risk of loosening under vibration
• High hardness rating of Rockwell C37 for excellent wear resistance and durability under repeated use
• Fully threaded design with UNF fine threads offers maximum grip and load distribution along the entire length
• Standard hex socket drive (3/8") allows for easy installation and removal with common tools, even in confined spaces
• Compliance with global standards including ASTM A574, RoHS 3, and REACH for assured quality and environmental safety

Professional Applications & Engineering Value

This 7/16"-20 UNF socket head cap screw is engineered to address critical challenges in industrial and mechanical assemblies where high tensile strength and corrosion resistance are paramount. The black-oxide alloy steel construction combats rust and wear in demanding environments such as automotive, aerospace, and heavy machinery. Its fully threaded design with Class 3A precision fit ensures uniform stress distribution and prevents thread stripping, making it ideal for applications requiring reliable, vibration-resistant fastening. The UNF fine thread profile enhances clamping force and is commonly used in precision equipment, while the hex socket drive facilitates quick assembly in tight spaces, reducing installation time and improving operational efficiency.

Specification Summary & Compliance

This socket head cap screw features a Class 3A thread fit for high precision and adheres to UNF fine thread standards with a size of 7/16"-20. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for hazardous substances.