S-92210A544 1/4"-20 x 1 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 and passivated finish for long-lasting performance in harsh environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Efficient installation via 5/32" hex drive and standard 82° countersink angle for flush mounting and streamlined assembly
• Full threading coverage across the 1-1/4" length provides maximum grip and adjustment flexibility
• Rigorous quality assurance through compliance with ASME B18.3 manufacturing standards
• Environmental and safety compliance meeting RoHS 3 and REACH regulations for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4"-20 UNC flat head screws address critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The 18-8 Stainless Steel composition, enhanced by a passivated finish, delivers robust resistance to oxidation and chemical exposure, significantly extending service life in moist or corrosive environments. The coarse UNC thread design and Class 3A fit minimize cross-threading risks while maintaining high clamping force under dynamic loads. Combined with the hex drive and 82° countersink, these screws enable rapid, secure installations in tight spaces—making them ideal for aerospace, automotive, and heavy-duty enclosures where reliability and flush surface profiles are paramount.

Specification Summary & Compliance

This product adheres to precise dimensional and performance criteria, including Class 3A thread fit per UNC standards, ensuring tight tolerances for superior fastening integrity. Manufacturing follows ASME B18.3 specifications, guaranteeing consistency in head profile, drive size, and thread geometry. Environmental and safety compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances. The screw's full threading, right-hand orientation, and inch-based measurements support seamless integration into both specialized and general-purpose assemblies.