S-90403A870 M5 x 20 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
- High tensile strength rating of 60,000 PSI ensures reliable performance in demanding mechanical applications
- Optimized drive engagement with Phillips No. 2 drive for efficient installation and reduced cam-out risk
- Precision thread fit with Class 6g coarse threads providing excellent engagement and assembly consistency
- Full threading design allows maximum adjustability and secure fastening along the entire 20mm length
- Regulatory compliance assurance meeting ASME B18.13.1M standards and environmental regulations
Professional Applications & Engineering Value
These M5 metric screws with internal-tooth lock washers address critical vibration-induced loosening in industrial machinery, automotive assemblies, and electrical enclosures. The zinc-plated steel construction provides essential corrosion resistance for harsh environments, while the coarse thread design (0.8mm pitch) ensures rapid installation and reliable performance in various materials. The combination of 60,000 PSI tensile strength and Rockwell B73 hardness delivers exceptional durability against mechanical stress and fatigue. The rounded pan head with Phillips drive offers low-profile fastening with efficient torque transfer, making these fully threaded screws ideal for applications requiring consistent clamping force and vibration resistance throughout the assembly.
Specification Summary & Compliance
Manufactured to precise metric dimensions with M5 x 0.8mm coarse threads meeting Class 6g tolerance standards. These rounded head screws comply with ASME B18.13.1M mechanical specifications and feature complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance. The 20mm length with fully threaded design ensures consistent performance across industrial applications requiring reliable, vibration-resistant fastening solutions.
