S-90317A579 M4 x 12 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Stainless Steel Pan Head Phillips Screws with External-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 external-tooth lock washer that maintains clamp load in high-motion environments
- Exceptional corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- Optimized drive engagement with Phillips No. 2 drive for efficient installation and reduced cam-out risk
- Reliable thread performance with Class 6g metric coarse threads ensuring consistent mating and assembly precision
- Enhanced mechanical strength delivering 70,000 PSI tensile strength and Rockwell B70 hardness for demanding applications
- Secure locking action through 410 stainless steel washer that resists loosening under dynamic loads
- Full-threaded design providing maximum grip length and uniform stress distribution
Professional Applications & Engineering Value
These M4 pan head screws with integrated external-tooth lock washers address critical vibration-induced failure points in industrial assemblies. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to corrosion in harsh environments, while the metric coarse threading (M4 x 0.7mm) ensures rapid installation and reliable performance in machinery, electrical enclosures, and automotive components. The Phillips drive design offers familiar, efficient installation with standard tools, making these fully threaded screws ideal for production lines where speed and reliability are paramount. The lock washer mechanism creates continuous spring tension that compensates for material relaxation and thermal cycling, maintaining joint integrity in applications subject to constant motion or temperature variations.
Specification Summary & Compliance
Manufactured to precise Class 6g thread fit tolerances with fully threaded M4 x 0.7mm coarse pitch configuration. Complies with ASME B18.13.1M standard for metric machine screws and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include 12mm length, 8mm pan head diameter, and integrated external-tooth lock washer (7.82mm OD, 0.6mm thickness) manufactured from 410 stainless steel with matching passivated finish.
