S-91773A107 4-40 x 5/16" ASME B18.6.3 Stainless Steel Round Head Phillips Screws
Stainless Steel Round Head Phillips 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, ensuring long-term reliability in harsh environments
- Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for demanding industrial applications
- Reliable coarse threading with UNC thread form and Class 2A fit for quick, secure installations and vibration resistance
- Optimized drive performance featuring a No. 1 Phillips drive for efficient torque transfer and reduced cam-out risk
- Full-threaded design providing maximum grip length and consistent holding power across the entire fastener
- Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
- Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use in regulated applications
Professional Applications & Engineering Value
These 4-40 UNC coarse thread rounded head screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 Stainless Steel material with passivated finish creates a robust barrier against oxidation and chemical exposure, making these Phillips drive screws ideal for electronics enclosures, machinery panels, and outdoor equipment. The fully threaded design ensures maximum engagement in tapped holes or nuts, while the Class 2A thread fit provides consistent installation torque without binding. These industrial screws solve common fastening challenges in manufacturing environments where vibration loosening and material degradation compromise assembly integrity.
Specification Summary & Compliance
This rounded head screw features precise dimensional specifications including 0.211" head diameter, 5/16" length, and Class 2A thread fit per UNC standards. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
