S-91737A252 1/4"-20 x 1/2" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Optimized drive engagement through Phillips No. 3 drive and high, narrow fillister head design for efficient installation
• Precision thread compatibility with Class 2A fit UNC coarse threads ensuring secure fastening in various materials
• Full threading coverage along the 1/2" length for maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH)
• Versatile industrial application with right-hand threaded design suitable for automated and manual assembly processes

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC fully threaded screws provide critical solutions where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 Stainless Steel construction with passivated finish creates a durable barrier against chemical exposure and atmospheric corrosion, significantly reducing maintenance frequency in applications from marine equipment to food processing machinery. The rounded fillister head with Phillips drive offers superior countersinking capability while the coarse thread design ensures rapid installation and strong holding power in both metallic and non-metallic substrates. These characteristics make them ideal for assembly lines requiring consistent performance and reduced installation time.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance per UNC standards with 1/4"-20 coarse thread specification and fully threaded design along the 1/2" length. Manufacturing complies with ASME B18.6.3 dimensional requirements, while environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring suitability for global industrial applications with strict regulatory requirements.