S-93405A108 4-40 x 3/8" ASME B18.13 Steel Pan Head Phillips Screws with Split Lock Washer
Steel Pan Head Phillips Screws with Split 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 demanding industrial environments
- Reliable vibration resistance through integrated split lock washer that maintains tight fastening under dynamic loads
- Optimized installation efficiency with Phillips No. 1 drive design for secure tool engagement and reduced cam-out
- Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring consistent performance and easy assembly
- Enhanced load distribution through rounded pan head design that minimizes surface damage during tightening
- Full regulatory compliance meeting ASME B18.13 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated split lock washer provide critical vibration resistance in industrial assemblies where loosening under dynamic loads poses significant reliability concerns. The rounded pan head design distributes clamping force effectively while the Phillips No. 1 drive ensures secure tool engagement during high-volume installation. Engineered with coarse UNC threads and Class 2A fit, these fully threaded fasteners deliver consistent performance in metal fabrication, electrical enclosures, and machinery where 60,000 psi tensile strength and Rockwell B70 hardness prevent stripping and deformation. The zinc-plated finish provides essential corrosion protection for extended service life in manufacturing environments.
Specification Summary & Compliance
This rounded head screw features precise 4-40 UNC coarse threads with Class 2A thread fit tolerance for reliable engagement. Manufacturing complies with ASME B18.13 specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring safe use in regulated industries. The fastener delivers 60,000 psi tensile strength and Rockwell B70 hardness with full threading along the 3/8" length for maximum holding power.
