S-91773A131 5-40 x 3/4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for reliable, high-stress fastening.
• Broad compatibility and easy installation with standard UNC coarse threads and Phillips No. 2 drive, ensuring quick assembly and wide applicability.
• Maximum thread engagement due to the fully threaded design, providing superior holding power across the entire 3/4" length.
• Precise and reliable fit with Class 2A thread fit, reducing the risk of cross-threading and ensuring consistent performance.
• Compliance with industry standards including ASME B18.6.3, guaranteeing dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting strict regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This 5-40 UNC coarse thread rounded head screw is engineered from 18-8 stainless steel to address common industrial challenges such as corrosion, vibration loosening, and mechanical failure. The passivated finish significantly enhances surface durability and resistance to oxidation, making it suitable for applications in marine, chemical processing, and outdoor equipment where moisture and corrosive agents are present. The combination of a fully threaded design and UNC coarse threads ensures rapid installation and strong grip in various materials, from metals to plastics, reducing assembly time and improving joint integrity. Its rounded head and Phillips drive provide a flush finish and ease of use with standard tools, ideal for machinery, enclosures, and structural assemblies requiring a secure, low-profile fastener that withstands dynamic loads and environmental stressors.

Specification Summary & Compliance

This screw features a 5-40 UNC coarse thread with Class 2A fit for precise dimensional tolerance, ensuring consistent thread engagement. It is manufactured in compliance with ASME B18.6.3 specifications for mechanical and dimensional standards. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations regarding hazardous substances.