S-91772A561 1/4"-28 x 1" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Exceptional tensile strength rated at 70,000 psi for secure, vibration-resistant fastening in demanding applications
• Precision thread engagement with Class 2A fit and UNF fine threading for optimal clamping force and reduced loosening
• Enhanced drive stability through Phillips No. 3 drive design, minimizing cam-out during installation
• Optimized head geometry with standard pan profile providing excellent bearing surface and streamlined appearance
• Full threading along 1" length for maximum grip range and versatile positioning in assembly operations
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 & REACH

Professional Applications & Engineering Value

Engineered for precision assemblies requiring reliable corrosion resistance and consistent performance, this 1/4-28 UNF machine screw addresses critical industrial fastening challenges. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making it ideal for marine, food processing, and outdoor equipment applications. The combination of UNF fine threading and Class 2A thread fit ensures vibration-resistant connections in machinery, electronic enclosures, and precision instruments. With 70,000 psi tensile strength and Rockwell B70 hardness, this fully threaded machine screw maintains structural integrity under dynamic loads while the pan head design with Phillips No. 3 drive facilitates efficient installation in confined spaces.

Specification Summary & Compliance

This precision fastener maintains Class 2A thread fit tolerances per UNF thread standards with exact dimensional specifications including 1/4"-28 thread size and 1" length. Manufacturing conforms to ASME B18.6.3 mechanical standards ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, providing assurance for regulated industries and international supply chains.