S-90166A116 1/4"-20 x 1 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 maintenance costs
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Integrated flange design eliminates the need for a separate washer, providing wider bearing surface and faster installation
• Coarse UNC threading offers excellent grip in a wide range of materials and resists loosening
• External hex drive allows for high-torque installation with common tools, speeding up assembly processes
• Class 2A thread fit provides consistent, free-spinning assembly for efficient production line use
• Partial threading allows for precise clamping force on specific sections of an assembly

Professional Applications & Engineering Value

This 18-8 stainless steel hex head screw is engineered to solve critical challenges in industrial assembly. The UNC coarse thread and Class 2A fit ensure rapid, reliable fastening in metals and plastics, reducing assembly time. The flanged head distributes clamping force effectively, preventing surface damage and compensating for misaligned holes. Its 70,000 psi tensile strength and Rockwell B80 hardness provide exceptional resistance to shear and tensile stresses in machinery, construction, and transportation equipment. The corrosion-resistant material makes it suitable for outdoor, marine, and chemical processing applications where durability is paramount.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured in compliance with ASTM F593 specifications, ensuring material and mechanical property consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances for safe use in various global markets.