S-90317A585 M4 x 20 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 corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Reliable vibration resistance provided by the integrated 410 stainless steel external-tooth lock washer, preventing loosening under dynamic loads.
- High-strength performance with 70,000 psi tensile strength and Rockwell B70 hardness for demanding mechanical applications.
- Efficient installation using a standard No. 2 Phillips drive, ensuring quick and secure fastening with common tools.
- Optimal thread engagement with a fully threaded M4 coarse thread (Class 6g fit), enabling strong holding power in various materials.
- Secure compliance meeting ASME B18.13.1M standards and environmental regulations like RoHS 3 and REACH for global supply chain use.
- Durable washer integration featuring an 8.05 mm OD external-tooth lock washer that maintains locking performance over repeated use.
Professional Applications & Engineering Value
This M4 pan head screw with an external-tooth lock washer is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery, electronics, and automotive assemblies. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemicals, extending service life in humid or corrosive settings. The coarse metric thread (0.7 mm pitch) and fully threaded design ensure rapid installation and robust grip in metals or plastics, while the Phillips drive allows for efficient torque application without slippage. Ideal for lock washer applications requiring secure fastening, this screw reduces maintenance needs and enhances assembly reliability in high-stress environments.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including a Class 6g thread fit for consistent metric threading and an 8 mm pan head diameter. It complies with ASME B18.13.1M for machine screw specifications and is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory acceptance in industrial markets.
