S-92210A744 1/2"-20 x 1 1/2" 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 industrial environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
• Precision Class 3A thread fit ensures tight tolerances and secure mating with UNF fine threads for vibration resistance
• Efficient installation with 5/16" hex drive and 82° countersink angle for flush mounting and reduced assembly time
• Full threading along 1-1/2" length provides maximum grip and load distribution across the entire fastener
• Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for safe, globally accepted industrial use
• Right-hand fine thread design offers improved adjustment precision and holding power in dynamic applications

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/2"-20 UNF flat head screws address critical challenges in machinery assembly, structural frameworks, and precision equipment. The 18-8 stainless steel material combined with a passivated finish provides outstanding resistance to oxidation and chemical exposure, reducing maintenance costs in corrosive settings. The Class 3A thread fit and fine thread spacing ensure minimal backlash and superior clamp load retention, preventing loosening under vibration—common in automotive, aerospace, and heavy machinery. The hex drive and 82° countersink facilitate quick, tool-compatible installation while maintaining a low-profile, aerodynamically smooth surface. Ideal for applications requiring high tensile strength and dimensional accuracy per ASME B18.3, these screws deliver reliability in load-bearing and precision-alignment scenarios.

Specification Summary & Compliance

This flat head screw adheres to inch system dimensions with a 1/2"-20 UNF thread size, Class 3A tolerance for precise fit, and fully threaded 1-1/2" length. Manufacturing and quality are governed by ASME B18.3 specifications. The product is confirmed RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets environmental and safety regulations for hazardous substances.