S-90317A176 M4 x 20 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Stainless 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
- Excellent corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- Reliable installation performance with Phillips No. 2 drive providing positive engagement and reduced cam-out risk
- High mechanical strength delivering 70,000 PSI tensile strength and Rockwell B70 hardness for demanding applications
- Optimized thread engagement with Class 6g tolerance and coarse thread pitch ensuring consistent performance
- Secure locking action from 410 stainless steel washer that prevents loosening under dynamic loads
- Full thread coverage along the 20mm length for maximum grip strength in various material thicknesses
Professional Applications & Engineering Value
These M4 metric screws with internal-tooth lock washers provide critical vibration resistance in industrial machinery, automotive assemblies, and electronic enclosures where loosening from constant motion poses reliability risks. The 18-8 stainless steel construction combined with passivated finish ensures long-term corrosion resistance in humid or chemically aggressive environments. The rounded pan head design offers a low-profile installation while the Phillips drive enables efficient assembly with standard tools. With coarse threading and Class 6g tolerance, these fully threaded screws deliver consistent clamping force across various substrate materials, making them ideal for production lines requiring repeatable fastening performance.
Specification Summary & Compliance
Manufactured to Class 6g thread fit tolerance with M4 x 0.7mm coarse thread specification. Complies with ASME B18.13.1M mechanical standards for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include 20mm length, 8mm head diameter, and integrated 410 stainless steel lock washer with passivated finish matching the screw's corrosion protection.
