S-91783A121 4-40 x 2" ASME B18.6.3 Stainless Steel Round Head Slotted Screws
Stainless Steel Round Head Slotted 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 industrial environments
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
- Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit and reduced cross-threading risks
- Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
- Compliant with major industry standards including ASME B18.6.3 for dimensional accuracy and quality assurance
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for restricted substance control
- Traditional slotted drive compatibility with rounded head profile for straightforward installation using standard tools
Professional Applications & Engineering Value
These 18-8 stainless steel rounded head slotted screws deliver critical performance advantages in demanding applications where corrosion resistance and mechanical reliability are paramount. The combination of fully threaded 4-40 UNC coarse threading and Class 2A thread fit ensures rapid installation with minimal binding in materials ranging from metals to engineered plastics. The passivated surface treatment significantly enhances the natural corrosion resistance of stainless steel, making these fasteners ideal for chemical processing equipment, marine components, food machinery, and outdoor industrial assemblies. With their 100,000 psi tensile strength, they provide dependable clamping force in vibration-prone environments while maintaining Rockwell B100 hardness to prevent thread deformation during repeated disassembly cycles.
Specification Summary & Compliance
This 4-40 UNC threaded screw features precise Class 2A thread tolerances with coarse thread spacing and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional consistency. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring restricted substance control throughout the supply chain.
