S-91771A186 3-56 x 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• High tensile strength of 80,000 PSI ensures reliable, long-lasting fastening under demanding loads
• Precise Class 2A thread fit provides smooth installation and consistent engagement in fine-thread applications
• Full threading along the 3/8" length maximizes grip and distribution of clamping force
• Standard 82° countersink angle allows for flush mounting in precision assemblies
• Phillips No. 1 drive offers familiar, efficient installation with standard tools
• Compliance with major standards including ASME B18.6.3, ensuring interchangeability and quality

Professional Applications & Engineering Value

These 3-56 UNF flat head Phillips screws are engineered to address common challenges in precision machinery, electronics, and industrial equipment where space constraints and corrosion resistance are critical. The passivated 18-8 stainless steel material provides excellent protection against oxidation and chemical exposure, extending service life in humid or corrosive environments. The fine thread spacing and Class 2A thread fit ensure secure fastening in thin materials and reduce the risk of stripping, while the flat head design sits flush to prevent interference in compact assemblies. Ideal for applications requiring reliable, RoHS and REACH compliant fasteners that meet stringent industry specifications.

Specification Summary & Compliance

This fastener features a 3-56 UNF thread size with fine thread spacing and Class 2A thread fit for precise tolerance. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.