S-98164A911 1/4"-20 x 1 1/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing in demanding applications
• Precise, secure fastening with Class 3A thread fit and UNC coarse threading, ensuring excellent engagement and vibration resistance
• Efficient installation and removal via the 5/32" hex drive, providing a positive grip and reducing tool slippage
• Versatile fully threaded design for consistent holding power along the entire 1 1/8" length, suitable for various material thicknesses
• Compliant with industry standards including ASME B18.3, meeting rigorous engineering specifications for quality and reliability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safety and regulatory adherence

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC fully threaded rounded head screws provide exceptional reliability where corrosion resistance and mechanical strength are critical. The 316 stainless steel material, enhanced by a passivated finish, effectively resists chemical and atmospheric degradation, making these fasteners ideal for marine, chemical processing, and food industry applications. The coarse thread design and Class 3A thread fit ensure quick assembly and superior vibration resistance, reducing maintenance needs in machinery and structural assemblies. With their rounded button head and hex drive, they offer a low-profile, secure fastening solution that withstands high-stress conditions while maintaining compliance with ASME B18.3 standards for consistent performance.

Specification Summary & Compliance

This 1/4"-20 UNC screw features a Class 3A thread fit with coarse threading for precise dimensional accuracy. Manufacturing adheres to ASME B18.3 specifications, ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances and supporting sustainable procurement practices.