S-90403A879 M8 x 25 mm ASME B18.13.1M Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Steel Pan Head Phillips Screws with Internal-Tooth 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 vibration resistance with integrated internal-tooth lock washer that maintains clamping force in high-stress environments
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial conditions
- Reliable thread engagement with Class 6g tolerance and coarse 1.25mm pitch for quick assembly and secure fastening
- High mechanical strength delivering 60,000 psi tensile strength and Rockwell B73 hardness for demanding applications
- Optimized drive performance featuring Phillips No. 4 drive for efficient installation with standard tools
- Complete thread coverage with 25mm fully threaded design ensuring maximum grip length and load distribution
- Industry compliance assurance meeting ASME B18.13.1M specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This M8 pan head screw with integrated internal-tooth lock washer addresses critical vibration-induced loosening in industrial machinery, automotive assemblies, and electrical enclosures. The zinc-plated steel construction provides essential corrosion resistance while maintaining the 60,000 psi tensile strength required for structural applications. The coarse 1.25mm thread pitch enables rapid installation and superior holding power in softer materials and high-vibration environments. With Class 6g thread fit precision and fully threaded 25mm length, these metric screws deliver consistent clamping force across the entire engagement area, preventing joint failure in critical assemblies where reliability is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.13.1M standards with Class 6g thread tolerance for precision fit. Features M8 x 1.25mm coarse threads with right-hand direction and 25mm fully threaded length. The zinc-plated steel construction meets Rockwell B73 hardness and 60,000 psi tensile strength requirements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.
