S-91773A110 4-40 x 1/2" 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 thanks to 18-8 Stainless Steel construction and passivated finish, ideal for harsh environments
- High-strength performance with 100,000 psi tensile strength and Rockwell B100 hardness for reliable, durable fastening
- Precision threading with Class 2A UNC coarse threads ensures easy installation and secure fit in various materials
- Optimized drive engagement from the Phillips No. 1 drive style reduces cam-out and improves installation efficiency
- Fully threaded design provides maximum grip and holding power along the entire 1/2" length
- Regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures quality and environmental safety
- Rounded head profile offers a finished appearance and reduces surface damage during installation
Professional Applications & Engineering Value
These 4-40 UNC Rounded Head Phillips Screws deliver critical engineering value in precision assembly applications where corrosion resistance and mechanical strength are paramount. Manufactured from 18-8 Stainless Steel with a passivated finish, they effectively combat rust and chemical degradation in demanding environments like electronics enclosures, medical devices, and marine equipment. The fully threaded coarse UNC thread design provides excellent pull-out resistance in softer materials while maintaining easy installation. With their Phillips drive and rounded head profile, these screws minimize installation damage and ensure consistent torque application, making them ideal for automated assembly lines and maintenance applications requiring reliable, repeatable fastening performance.
Specification Summary & Compliance
This screw features precision 4-40 UNC Class 2A threads with right-hand direction and coarse spacing, manufactured to exacting dimensional standards. The product complies with ASME B18.6.3 specifications for dimensional requirements and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restriction of hazardous substances. The combination of 100,000 psi tensile strength and Rockwell B100 hardness provides reliable mechanical performance for industrial applications.
