S-90152A111 4-40 x 3/16" ASME B18.3, ASTM F837 Stainless Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and extended service life
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress
• Precise, secure fastening ensured by Class 3A thread fit, minimizing the risk of loosening in critical assemblies
• Easy installation and removal with a 3/32" hex drive and standard socket head, allowing for high torque application in confined spaces
• Broad industrial compatibility due to UNC coarse thread and 4-40 size, facilitating quick assembly and interchangeability
• Full-length threading provides consistent grip and clamping force along the entire 3/16" length for versatile mounting
• Compliance with major standards including ASME B18.3 and ASTM F837, ensuring quality and reliability for professional use

Professional Applications & Engineering Value

This 4-40 UNC Thread Socket Head Cap Screw is engineered to address common industrial challenges such as vibration-induced loosening and material degradation. The 18-8 Stainless Steel offers excellent corrosion resistance, making it suitable for applications in moist or chemically aggressive environments, including marine, chemical processing, and outdoor equipment. The Class 3A thread fit and coarse UNC thread provide superior holding power and ease of assembly, reducing installation time and improving reliability in machinery, electronics, and automotive systems. Its socket head design with a hex drive allows for high torque application in tight spaces, minimizing the risk of stripping and ensuring a secure, long-lasting connection that withstands dynamic loads and thermal cycling.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 3A fit for precise dimensional accuracy, a length of 3/16", and is fully threaded for consistent performance. It complies with ASME B18.3 and ASTM F837 manufacturing specifications, ensuring adherence to industry standards for quality and safety. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its environmental and regulatory suitability for global markets.