S-91500A128 4-40 x 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 from 316 stainless steel construction, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Precision threading with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced durability through passivated surface treatment providing extra protection against oxidation and wear
- Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
- Full-threaded design offering maximum grip length and holding power across the entire fastener length
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in 316 stainless steel deliver critical performance advantages for demanding industrial applications. The combination of passivated finish and marine-grade stainless steel material provides exceptional protection against corrosion in chemical processing, marine, and food processing equipment where moisture and aggressive substances are present. The fully threaded coarse UNC thread form ensures maximum engagement in both metallic and non-metallic materials, while the Phillips No. 1 drive offers efficient installation with reduced cam-out risk. The standardized 82° countersink angle creates clean, flush installations in precision assemblies where surface protrusions are unacceptable, making these screws ideal for electronic enclosures, machinery panels, and instrumentation requiring reliable, corrosion-resistant fastening solutions.
Specification Summary & Compliance
These flat head Phillips screws feature precise Class 2A thread fit per UNC standards with 4-40 coarse threading and 1/2" length. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors without hazardous substance restrictions.
