S-90403A861 M4 x 6 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 through the integrated internal-tooth lock washer, preventing loosening in high-stress applications
- Enhanced corrosion protection with zinc-plated steel finish, extending service life in demanding industrial environments
- Optimized drive engagement with Phillips No. 2 drive style for efficient installation and reduced cam-out risk
- Reliable thread performance with Class 6g fit coarse threading ensuring secure fastening in various materials
- Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B73 hardness for heavy-duty applications
- Secure washer integration featuring 8.58mm OD internal-tooth design that maintains locking capability under dynamic loads
- Industry-standard compliance meeting ASME B18.13.1M specifications for consistent quality and interchangeability
Professional Applications & Engineering Value
These M4 metric screws with zinc-plated steel construction address critical vibration-induced loosening challenges in industrial equipment, machinery assembly, and electronic enclosures. The fully threaded coarse pitch design (0.7mm) combined with the internal-tooth lock washer creates a permanent locking mechanism that maintains clamp force under continuous operation. The rounded pan head profile with Phillips drive provides optimal torque transmission while minimizing surface protrusion. Engineered for Class 6g thread fit, these fasteners ensure precise engagement in both metallic and non-metallic components, making them ideal for automotive subsystems, industrial controls, and precision instrument assembly where vibration resistance and corrosion protection are paramount.
Specification Summary & Compliance
Manufactured to exacting metric thread standards with Class 6g tolerance for consistent fit and performance. The M4 x 0.7mm coarse thread configuration ensures reliable engagement across multiple applications. Full compliance with ASME B18.13.1M manufacturing specifications guarantees dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring safe use in regulated industries. The fully threaded design with integrated lock washer maintains specified performance throughout the fastener's service life.
