S-90585A546 1/4"-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 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life.
• High-strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring dependable performance under load.
• Precise thread engagement with Class 3A fit and UNC coarse spacing, providing secure fastening and reduced risk of cross-threading.
• Efficient installation using a standard 5/32" hex drive, allowing for quick assembly with common tools.
• Flush mounting capability with an 82° countersink angle and flat head design, creating a smooth surface finish.
• Full thread coverage along the 1 1/2" length, offering maximum grip and adjustability in various material thicknesses.
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws in 316 stainless steel are engineered to solve critical challenges in corrosive and high-stress environments. The passivated finish enhances the innate corrosion resistance of the material, making these fully threaded fasteners ideal for marine, chemical processing, and food industry applications where moisture and chemicals are prevalent. The coarse thread spacing and Class 3A fit ensure rapid, secure installation in soft metals or plastics, reducing assembly time and improving joint integrity. With a flat head and 82° countersink, they provide a flush surface, preventing snagging and maintaining aerodynamic or hygienic surfaces in machinery and equipment.

Specification Summary & Compliance

This screw adheres to inch system dimensions with a thread size of 1/4"-20 UNC and a Class 3A thread fit for precision. It conforms to the ASME B18.3 standard for dimensional accuracy and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted hazardous substances are used.