S-90166A141 1/2"-13 x 2 1/2" ASTM F593, IFI 111 Stainless Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing long-term replacement costs.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and in demanding structural applications.
• Flanged hex head design provides a larger bearing surface for improved load distribution and eliminates the need for a separate washer.
• Coarse UNC threads with Class 2A fit offer faster assembly, easier alignment, and excellent vibration resistance.
• Partial threading allows for precise clamping force on specific unthreaded sections, enhancing joint integrity.
• External hex drive enables high-torque installation with common tools, speeding up assembly and maintenance processes.
• Full compliance with ASTM F593, RoHS 3, and REACH guarantees material quality, performance consistency, and environmental safety for global projects.

Professional Applications & Engineering Value

This 1/2"-13 UNC hex head screw is engineered to solve critical challenges in industrial assembly and construction. Its 18-8 Stainless Steel composition provides excellent resistance to rust and chemical exposure, making it suitable for outdoor structures, marine equipment, and food processing machinery where moisture is a concern. The flanged head design distributes clamping force effectively, preventing surface damage and loosening under vibration—common in automotive frames, heavy machinery, and structural steel connections. With a coarse thread and Class 2A fit, it ensures quick, secure fastening even in misaligned holes, reducing installation time and labor costs. The partial threading offers controlled grip length for bolted joints that require precise unthreaded shank areas, enhancing shear strength and durability in high-stress applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threading per inch-system requirements. It is manufactured in compliance with ASTM F593 for material and mechanical properties, ensuring reliability in structural applications. Environmental and safety regulations are met, with full conformity to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming the absence of hazardous substances for safe use in various industries.