S-92210A171 1/4"-20 x 11/16" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement through Class 3A fit and UNC coarse threading, ensuring secure fastening and vibration resistance
• Efficient installation and flush seating with standard 82° countersink angle and hex drive design for streamlined assembly
• Full thread coverage along the 11/16" length for maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-controlled usage
• Durable flat head profile with 0.531" diameter providing stable, low-profile fastening in confined spaces

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws are engineered to address critical challenges in industrial assembly, machinery, and structural applications. The 18-8 stainless steel construction, enhanced by a passivated finish, provides long-term resistance to oxidation and chemical exposure, reducing maintenance costs in demanding environments. The Class 3A thread fit and coarse UNC threading deliver superior holding power and minimize loosening under dynamic loads, while the 82° countersink angle ensures a smooth, flush surface finish that prevents snagging and improves aesthetic integration. Ideal for heavy-duty fastening in automotive, electronics, and construction sectors, these screws combine precision manufacturing with robust material properties to enhance operational reliability and lifespan of assembled components.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing complies with ASME B18.3 specifications, with full conformance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fully threaded design and standardized 82° countersink angle support consistent performance across industrial applications.