S-91771A123 4-40 x 2 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for heavy-duty applications
- Optimized installation efficiency through Phillips No. 1 drive design and standard flat head profile
- Secure fastening performance with Class 2A thread fit and coarse UNC threading for reliable engagement
- Perfect flush mounting capability featuring 82° countersink angle for seamless surface integration
- Full-length threading ensures maximum grip and load distribution across the entire fastener length
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making them ideal for marine, food processing, and outdoor industrial equipment. The fully threaded design with coarse UNC threading ensures maximum holding power in various materials, while the 82° countersink angle creates seamless surface integration without protrusion. The Phillips drive system enables efficient installation in confined spaces, reducing assembly time and labor costs. These industrial screws maintain structural integrity under vibration and load stress, offering reliable performance in machinery, enclosures, and structural assemblies where high tensile strength and regulatory compliance are essential.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC thread type specifications. Compliant with ASME B18.6.3 manufacturing standards ensuring consistent quality and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use in regulated industries. The 2 1/2" length and fully threaded configuration provide standardized installation across various applications.
