S-90604A303 2-56 x 1/4" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Superior mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for reliable, long-lasting fastening.
• Optimized thread engagement with UNC coarse thread and Class 2A fit, ensuring easy installation and secure hold in various materials.
• Versatile drive compatibility featuring both Phillips and slotted drive (No. 1 size) for flexible tool use and reduced stripping risk.
• Space-efficient rounded pan head design providing a low-profile, finished appearance while accommodating standard wrenches.
• Full threading along the 1/4" length maximizes grip and distributes load evenly, enhancing joint integrity.
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 2-56 UNC coarse thread screws address critical fastening challenges. The 18-8 stainless steel material, combined with a passivated finish, resists oxidation and chemical exposure, prolonging service life in machinery, electronics, and outdoor equipment. The rounded pan head and Phillips/slotted drive facilitate quick assembly and disassembly, reducing labor time. With a Class 2A thread fit and coarse threading, they provide excellent pull-out resistance in soft metals and plastics, minimizing the risk of thread failure. Ideal for precision assemblies where vibration resistance and consistent performance are paramount, these screws deliver reliable fastening solutions that meet rigorous engineering standards.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including Class 2A thread fit per UNC standards and a 1/4" length with full threading. It conforms to ASME B18.6.3 for mechanical and dimensional specifications, ensuring interoperability. Environmental and safety compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming the absence of hazardous substances. The right-hand thread direction and standardized rounded head profile further support consistent performance across applications.