S-93405A107 4-40 x 5/16" 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 for extended service life in demanding environments
- Reliable vibration resistance through integrated split lock washer that maintains clamping force under dynamic loads
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Optimized thread engagement with Class 2A thread fit and coarse UNC threading for faster assembly and secure fastening
- Enhanced drive stability with Phillips No. 1 drive that provides positive torque transfer and reduces cam-out
- Versatile pan head design with rounded profile for flush mounting and improved aesthetic integration
- Full thread coverage along the 5/16" length ensures maximum grip strength across the entire fastener
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with integrated split lock washers deliver critical vibration resistance in industrial assemblies where loosening under dynamic loads poses significant reliability concerns. The coarse thread configuration enables rapid installation in various materials while maintaining Class 2A thread fit precision for consistent torque values. The zinc-plated finish provides essential corrosion protection for equipment exposed to moderate environmental conditions, extending maintenance intervals in electrical enclosures, machinery guards, and automotive components. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these rounded head Phillips screws withstand both static and dynamic loading without compromising fastener integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.13 specifications with Class 2A thread fit tolerances for precision assembly. Features 4-40 UNC coarse threads with right-hand orientation and full threading along the 5/16" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The integrated split lock washer (0.222" OD, 0.034" thickness) maintains consistent locking performance while the zinc-plated steel construction meets industrial corrosion protection requirements.
