S-90400A213 4-40 x 3/16" 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
- Enhanced corrosion resistance through zinc-plated steel construction for extended service life in demanding environments
- Superior vibration resistance with integrated spring lock washer that maintains clamping force under dynamic loads
- High tensile strength performance rated at 60,000 psi for reliable fastening in structural applications
- Optimized drive engagement with Phillips No. 1 drive for efficient installation and reduced cam-out
- Precise thread compatibility with Class 2A UNC coarse threads ensuring smooth assembly and consistent fit
- Complete thread coverage with fully threaded design for maximum grip length and holding power
- Industry-standard compliance meeting ASME B18.13 specifications for guaranteed dimensional accuracy
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated spring lock washer provide exceptional engineering value in vibration-prone industrial applications. The combination of Rockwell B70 hardness and 60,000 psi tensile strength ensures reliable performance in machinery assembly, electronic enclosures, and automotive components where loosening under dynamic loads is a critical concern. The coarse thread design facilitates quick installation in various materials while the rounded pan head profile with Phillips drive offers streamlined assembly in confined spaces. The zinc plating provides essential corrosion protection, making these fully threaded screws ideal for outdoor equipment, manufacturing fixtures, and maintenance applications requiring durable, vibration-resistant fastening solutions.
Specification Summary & Compliance
This rounded head screw features precise Class 2A thread fit with 4-40 UNC coarse threads and right-hand threading. Manufactured to ASME B18.13 specifications for dimensional accuracy, the fastener maintains Rockwell B70 hardness and 60,000 psi tensile strength. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across industrial sectors. The integrated spring lock washer (0.25" OD, 0.015" thickness) manufactured from zinc-plated steel provides consistent locking performance while maintaining regulatory compliance.
