S-91205A622 3/8"-16 x 3/4" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch ensures screws stay securely fastened in high-stress environments, eliminating the need for secondary locking devices.
• Exceptional tensile strength of 170,000 psi provides reliable performance in heavy-duty applications, reducing the risk of fastener failure.
• Temperature stability from -70° to 250°F allows consistent performance across a wide range of industrial and outdoor conditions.
• Precise Class 3A thread fit ensures smooth installation and superior engagement, minimizing cross-threading and assembly errors.
• Durable black-oxide coating on alloy steel offers corrosion resistance and extended service life in demanding environments.
• Standard hex socket drive (5/16") enables easy installation with common tools, improving assembly efficiency.
• Full compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability with standardized components.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial assembly and machinery. The permanent nylon patch thread locker effectively counters vibration-induced loosening, making it ideal for automotive, aerospace, and heavy equipment applications where reliability is paramount. The coarse UNC thread and Class 3A fit ensure quick, accurate installation with reduced risk of stripping, while the high tensile strength (170,000 psi) and Rockwell C37 hardness provide durability under extreme loads. Its temperature-resistant locking capability maintains integrity from sub-zero to high-heat environments, offering a versatile solution for engineers seeking to enhance assembly security and longevity without compromising on standards compliance.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with Class 3A precision fit and is fully threaded for consistent engagement. Manufacturing adheres to ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and material integrity. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries and environmentally conscious supply chains.