S-90400A216 4-40 x 1/2" ASME B18.13 Steel Pan Head Phillips Screws with Spring Lock Washer
Steel Pan Head Phillips Screws with Spring Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Reliable vibration resistance through integrated spring lock washer that maintains clamping force under dynamic loads
- High tensile strength performance rated at 60,000 psi for secure fastening in critical applications
- Optimized drive engagement with Phillips No. 1 drive for efficient installation and reduced cam-out
- Precise thread compatibility featuring Class 2A UNC coarse threads for easy assembly and consistent fit
- Enhanced durability with Rockwell B70 hardness providing excellent wear resistance
- Comprehensive compliance meeting ASME B18.13 standards and environmental regulations for global applications
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated spring lock washers deliver exceptional engineering value in industrial applications where vibration resistance and corrosion protection are critical. The coarse thread design ensures rapid assembly while maintaining secure fastening, particularly in materials where fine threads might strip. The rounded pan head profile with Phillips drive provides optimal torque transmission and a low-profile finish. When used in machinery, electrical enclosures, or automotive components, the spring lock washer actively prevents loosening under cyclic loading, reducing maintenance requirements and improving operational reliability. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners withstand both static and dynamic stresses in demanding industrial environments.
Specification Summary & Compliance
This rounded head screw features precise Class 2A thread fit with UNC coarse threading (4-40) and 1/2" length. Manufacturing complies with ASME B18.13 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use.
