S-91772A691 3/8"-16 x 4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with passivated surface treatment, ideal for harsh environments and extended service life.
• High mechanical strength with 70,000 PSI tensile strength and Rockwell B70 hardness for reliable performance under heavy loads.
• Secure and efficient installation with a Phillips No. 4 drive and rounded pan head design, reducing cam-out and providing a flush finish.
• Precise and reliable thread engagement due to UNC coarse thread and Class 2A thread fit, ensuring consistent fastening in various materials.
• Optimized for partial threading applications with a 1-1/2" minimum thread length, offering flexibility in grip range and unthreaded shank benefits.
• Compliance with major industry standards including ASME B18.6.3, guaranteeing dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This 3/8"-16 x 4" passivated 18-8 stainless steel rounded head screw is engineered to address critical challenges in industrial fastening, such as corrosion in humid or chemical-exposed settings and the need for high tensile strength in structural assemblies. The UNC coarse thread and Class 2A thread fit ensure quick installation and reduced cross-threading risks, while the partially threaded design allows for precise clamping without thread interference. Its passivated surface enhances durability against oxidation, making it a reliable choice for machinery, construction, and marine applications where long-term fastening integrity is paramount. The Phillips drive and rounded pan head provide a secure, low-profile finish, ideal for panels and equipment housings.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, ensuring precise dimensions including a 4" length, 3/8"-16 UNC coarse thread, and Class 2A thread fit for consistent performance. It is manufactured from 18-8 stainless steel with a passivated finish and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free from restricted substances and suitable for global industrial use.