S-91781A110 4-40 x 1/2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws
Stainless Steel Slotted 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 18-8 stainless steel construction and passivated finish, ideal for harsh environments
- Exceptional tensile strength rated at 80,000 psi for reliable performance in demanding applications
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure, vibration-resistant connections
- Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
- Full threading capability providing maximum grip length and load distribution across the entire fastener
- Enhanced durability with Rockwell B80 hardness maintaining structural integrity under repeated use
- Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for precision assemblies requiring flush surface mounting, these 4-40 UNC flat head slotted screws deliver critical performance advantages in industrial applications. The 18-8 stainless steel composition combined with passivated finish provides exceptional resistance to corrosion and chemical exposure, making them ideal for manufacturing equipment, electronic enclosures, and marine components. The coarse UNC threading and Class 2A thread fit ensure rapid installation and reliable fastening in materials where fine threads might strip or fail. With full threading along the entire 1/2" length, these screws distribute clamping force evenly, preventing joint loosening under vibration while the standardized 82° countersink angle guarantees proper seating in precision-machined components.
Specification Summary & Compliance
This flat head slotted screw maintains precise dimensional accuracy with Class 2A thread fit tolerances and UNC coarse thread specifications. Manufacturing complies with ASME B18.6.3 standards for dimensional consistency and performance reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance adherence for global industrial applications.
