S-90400A217 4-40 x 3/4" 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, extending service life in harsh industrial environments
- Reliable vibration resistance through integrated spring lock washer that maintains clamp force under dynamic loads
- High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Quick installation efficiency with Phillips No. 1 drive and coarse UNC threads that reduce assembly time
- Precise thread engagement through Class 2A thread fit ensuring consistent fastening performance
- Full-thread design provides maximum grip length and load distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.13 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated spring lock washers deliver critical vibration resistance in machinery, electrical enclosures, and automotive assemblies where loosening under dynamic loads compromises safety and performance. The coarse thread design enables rapid installation in production environments while maintaining Class 2A thread fit precision. The zinc-plated steel construction provides essential corrosion protection for industrial equipment exposed to moisture, chemicals, or outdoor conditions. The rounded pan head profile with Phillips drive offers both low-profile clearance and efficient torque transfer, making these fasteners ideal for applications requiring reliable, repeated disassembly and reassembly without performance degradation.
Specification Summary & Compliance
This fully threaded 4-40 UNC screw features Class 2A thread fit tolerances with coarse thread spacing for optimal engagement. Manufactured to ASME B18.13 specifications with 60,000 psi tensile strength and Rockwell B70 hardness. The fastener system includes an integrated spring lock washer (0.25" OD, 0.015" thickness) manufactured from zinc-plated steel. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for restricted substance management.
