S-92210A543 1/4"-20 x 1 1/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding applications
• Rockwell B55 hardness maintains thread integrity and prevents stripping during repeated installations
• 82° countersink angle with standard flat head profile enables flush mounting for streamlined surfaces
• Fully threaded design offers maximum grip length and uniform stress distribution
• 5/32" hex drive compatibility allows for secure tool engagement and efficient installation

Professional Applications & Engineering Value

These 1/4-20 UNC flat head screws deliver exceptional performance in industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material and passivated finish provides superior protection against chemical exposure and environmental degradation, making them ideal for machinery, marine equipment, and food processing applications. The Class 3A thread fit with coarse UNC threading ensures rapid assembly while maintaining precise tolerances, reducing installation time without compromising joint integrity. The flat head design with 82° countersink creates seamless surface finishes in countersunk holes, eliminating protrusions that could interfere with moving parts or aesthetic requirements. These fully threaded screws distribute clamping force evenly across the entire engagement length, preventing stress concentration and extending service life in heavy-duty fastening applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit precision and UNC coarse thread specifications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. Features include 1/4"-20 thread size, 1-1/8" length, right-hand thread direction, and Rockwell B55 hardness with 70,000 psi tensile strength for consistent performance in inch system applications.