S-91783A572 1/4"-20 x 4" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under high stress.
• Optimized thread engagement with a partially threaded design, providing secure fastening while reducing material stress.
• Broad compatibility with UNC coarse threads and Class 2A fit, ensuring easy installation and interchangeability in standard assemblies.
• Durable and user-friendly drive featuring a slotted rounded head for straightforward manual installation and removal.
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-driven applications.
• Versatile 4-inch length with a minimum 1 1/2" thread length, suitable for a wide range of material thicknesses and fastening needs.

Professional Applications & Engineering Value

This 1/4"-20 UNC partially threaded screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The 18-8 Stainless Steel material, enhanced by a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it ideal for outdoor equipment, food processing machinery, and marine applications. The rounded head and slotted drive allow for quick, tool-accessible installation in confined spaces, while the coarse thread spacing ensures rapid assembly and strong holding power in wood, metal, and plastic substrates. Its partially threaded shank concentrates clamping force precisely where needed, reducing the risk of joint fatigue and improving overall assembly integrity in demanding industrial screw applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse threading per ASME B18.6.3 specifications. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances and suitable for global industrial use. The product guarantees reliable performance with a tensile strength of 100,000 psi and Rockwell B100 hardness, supporting its use in high-stress, precision-driven environments.