S-91772A050 3-56 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
• Enhanced thread engagement through fine UNF threading and Class 2A fit, providing secure fastening and vibration resistance.
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications.
• Optimized drive efficiency with Phillips No. 1 drive and pan head design, enabling quick installation and reduced tool slippage.
• Full threading along the 3/8" length ensures maximum grip and uniform stress distribution in assembled components.
• 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.

Professional Applications & Engineering Value

This 3-56 UNF fine thread screw is engineered to address critical fastening challenges in precision assemblies. The passivated 18-8 stainless steel material provides excellent resistance to oxidation and chemical exposure, making it ideal for electronics, machinery, and outdoor equipment where durability is paramount. The pan head with Phillips drive facilitates easy installation in confined spaces, while the fine thread design ensures superior holding power in thin materials and vibration-prone environments. Its fully threaded configuration and Class 2A thread fit deliver consistent clamping force, reducing the risk of loosening under dynamic loads. These features make it a reliable choice for OEMs and maintenance teams seeking long-term performance in industrial screw applications.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, ensuring precise dimensions including a 3/8" length and 0.193" head diameter. The UNF fine threads maintain Class 2A tolerance for consistent fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances. Manufacturing follows standardized processes to guarantee 70,000 psi tensile strength and Rockwell B70 hardness across production batches.