S-90317A571 M4 x 6 mm JIS B 1188 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 through integrated 410 stainless steel external-tooth lock washer that prevents loosening under dynamic loads
- High strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precise thread engagement with Class 6g fit and coarse M4 x 0.7mm threading ensuring secure fastening in various materials
- Optimized drive efficiency featuring Phillips No. 2 drive for controlled torque application and reduced cam-out risk
- Full thread coverage along the 6mm length provides maximum grip strength and uniform stress distribution
- Regulatory compliance meeting JIS B 1188 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These M4 metric screws with integrated external-tooth lock washers solve critical vibration-induced loosening problems in industrial equipment, automotive assemblies, and electronic enclosures. The 18-8 stainless steel core combined with passivated finish provides exceptional corrosion resistance for outdoor or chemically exposed environments. The fully threaded design with Class 6g precision ensures consistent clamping force across the entire engagement length, while the pan head profile with Phillips No. 2 drive offers efficient installation in confined spaces. This combination delivers reliable performance where vibration resistance, corrosion protection, and assembly integrity are paramount.
Specification Summary & Compliance
Manufactured to JIS B 1188 standards with Class 6g thread fit tolerance for metric coarse threading (M4 x 0.7mm). The fastener system combines an 18-8 stainless steel screw with 410 stainless steel external-tooth lock washer, both featuring passivated finish for enhanced corrosion protection. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness rating.
