S-91500A307 4-40 x 5/8" 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 316 stainless steel construction, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Enhanced durability through passivated surface finish, providing added protection against oxidation and wear
- Precision thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Streamlined installation featuring standard 82° countersink angle for flush mounting and Phillips No. 1 drive for common tool compatibility
- Full threading coverage along the 5/8" length maximizes grip strength and distribution across joined materials
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in 316 stainless steel address critical challenges in industrial settings where corrosion resistance and mechanical reliability are paramount. The passivated finish significantly extends service life in marine, chemical processing, and food-grade applications by preventing pitting and crevice corrosion. With fully threaded coarse UNC threads and Class 2A fit, they provide superior holding power in soft materials and plastics while resisting loosening under vibration. The 82° countersink and Phillips drive design enable flush mounting in precision assemblies, making them ideal for electronic enclosures, machinery panels, and structural components requiring smooth surface profiles. Their compliance with ASME B18.6.3 ensures dimensional consistency for replacement and maintenance operations.
Specification Summary & Compliance
This flat head screw maintains Class 2A thread fit tolerance per UNC standards with right-hand coarse threading. Manufacturing conforms to ASME B18.6.3 specifications for dimensional accuracy. The product is verified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substance restrictions.
