S-90403A864 M4 x 12 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 – Integrated internal-tooth lock washer prevents loosening under dynamic loads, ensuring long-term joint integrity
- Enhanced Durability in Harsh Environments – Zinc-plated steel construction provides reliable corrosion protection for extended service life
- Optimized Assembly Efficiency – Phillips No. 2 drive and pan head design enable quick installation with standard tools
- Consistent Thread Engagement – Class 6g coarse threads (M4 x 0.7mm) ensure reliable fastening across multiple material types
- High Mechanical Strength – 60,000 psi tensile strength and Rockwell B73 hardness withstand substantial operational stresses
- Full-Length Thread Coverage – 12mm fully threaded design maximizes grip range and adjustment flexibility
- Regulatory Compliance Assurance – Meets ASME B18.13.1M specifications while satisfying RoHS 3 and REACH environmental standards
Professional Applications & Engineering Value
These M4 pan head screws with integrated internal-tooth lock washers solve critical vibration-induced loosening problems in industrial equipment, automotive assemblies, and machinery frames. The zinc-plated steel construction maintains corrosion resistance while the coarse thread profile (Class 6g tolerance) ensures reliable engagement in both metallic and composite materials. The fully threaded 12mm length provides maximum clamping force distribution, making these metric screws ideal for applications requiring repeated disassembly and reassembly. With 60,000 psi tensile strength, they deliver exceptional performance in high-stress environments where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to ASME B18.13.1M standards with Class 6g thread fit tolerance. The M4 x 0.7mm coarse thread configuration ensures compatibility with standard metric components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety. The internal-tooth lock washer (8.58mm OD, 0.51mm thickness) maintains consistent locking performance across temperature variations and dynamic loading conditions.
