S-92210A021 3-48 x 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening
• Streamlined installation featuring hex drive (1/16") and 82° countersink for flush mounting in standard applications
• Full threading coverage across the 1/4" length maximizes grip strength and distribution of clamping force
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
• Durable flat head design with standard profile (0.226" diameter) providing reliable seating without protrusion

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these 3-48 UNC flat head screws address critical needs in machinery assembly, electronic enclosures, and precision equipment. The 18-8 stainless steel material combined with passivated finish resists chemical exposure and oxidation, extending service life in humid or corrosive operational environments. The hex drive configuration allows for high-torque installation without cam-out risks, while the 82° countersink ensures seamless surface integration. With Class 3A thread fit and coarse threading, these screws maintain joint integrity under dynamic loads and vibration, preventing loosening in automotive, aerospace, and manufacturing assemblies where precision and reliability are paramount.

Specification Summary & Compliance

This flat head screw maintains Class 3A thread fit per UNC standards with dimensional accuracy (0.099" thread diameter, 1/4" length). Manufacturing adheres to ASME B18.3 specifications, ensuring interchangeability and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted hazardous substances for global supply chain integration.