S-90403A865 M4 x 16 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 secure fastening in high-motion environments
- Exceptional durability and corrosion protection through zinc-plated steel construction for extended service life in harsh conditions
- High tensile strength of 60,000 psi ensures reliable performance under substantial mechanical stress
- Optimized thread engagement with Class 6g coarse threads providing quick installation and secure hold in various materials
- Enhanced driving efficiency with Phillips No. 2 drive design for straightforward installation and removal
- Consistent dimensional accuracy with rounded pan head profile ensuring proper seating and uniform pressure distribution
- Full thread coverage along 16mm length delivers maximum grip strength throughout the entire fastener engagement
Professional Applications & Engineering Value
These M4 metric screws with zinc-plated steel construction address critical industrial challenges where vibration loosening and corrosion compromise assembly integrity. The integrated internal-tooth lock washer technology provides permanent vibration resistance without requiring additional components, making them ideal for machinery, automotive assemblies, and electrical enclosures subject to constant motion. The Class 6g thread fit ensures precise engagement in both metallic and non-metallic materials, while the coarse 0.7mm pitch facilitates rapid installation in production environments. With fully threaded design and Rockwell B73 hardness, these rounded head screws maintain clamping force in high-stress applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to exacting metric dimensions with Class 6g thread tolerance for consistent performance. These fully threaded fasteners comply with ASME B18.13.1M manufacturing specifications and meet international regulatory standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety. The zinc-plated steel finish provides corrosion resistance while maintaining the 60,000 psi tensile strength required for demanding industrial applications.
