S-91858A852 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated finish
• High tensile strength of 70,000 psi ensures reliable fastening under demanding mechanical loads
• Precise UNC coarse threading with Class 2A fit provides smooth installation and secure engagement
• 82° countersink angle and flat head design enables flush mounting for clean, professional finishes
• Full threading along 5/8" length maximizes grip range and adjustment flexibility
• Rockwell B80 hardness maintains structural integrity and resists deformation during installation
• Slotted drive compatibility offers versatile installation options with standard tools

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance is critical. The passivated finish creates an enhanced protective layer that withstands chemical exposure and moisture, making them ideal for marine, chemical processing, and food industry applications. The UNC coarse thread spacing combined with Class 2A thread fit ensures rapid installation and reliable holding power in various materials. The 82° countersink angle allows for seamless flush mounting in precision applications where protruding fasteners are unacceptable. These fully threaded machine screws provide maximum thread engagement throughout their length, offering superior pull-out resistance in assemblies requiring repeated disassembly and maintenance.

Specification Summary & Compliance

This 1/4"-20 x 5/8" flat head screw features precision UNC coarse threads with Class 2A thread fit tolerance for consistent performance. Manufactured to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The passivated surface treatment meets industry standards for corrosion protection while maintaining the screw's mechanical integrity.