S-90585A550 1/4"-20 x 2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction and passivated finish for extended service life in harsh environments
• Superior installation control through 5/32" hex drive design that prevents cam-out and ensures secure fastening
• Reliable thread engagement with Class 3A thread fit providing precise tolerances for vibration-resistant connections
• Maximum holding power from 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Optimized flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Full-length thread coverage ensuring consistent grip strength along the entire 2" length of the screw
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 316 stainless steel flat head screws with 1/4"-20 UNC coarse threading provide critical solutions for industrial applications where corrosion resistance and structural integrity are paramount. The combination of passivated finish and marine-grade 316 stainless steel material offers exceptional protection against chemical exposure, saltwater environments, and industrial contaminants. The hex drive design ensures positive torque transmission during installation, eliminating stripping issues common in Phillips drives. With Class 3A thread fit and fully threaded construction, these screws maintain consistent clamping force in machinery, structural frameworks, and marine equipment where vibration resistance is crucial. The 82° countersink angle provides seamless flush mounting in precision applications requiring aerodynamic or hygienic surface profiles.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit tolerances ensuring precision threading compatibility. The UNC coarse thread profile (1/4"-20) provides optimal engagement in various materials while the right-hand thread direction follows industry standards. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for durable performance in demanding applications.