S-90403A876 M8 x 12 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 with integrated internal-tooth lock washer, preventing loosening in high-stress applications
- Enhanced corrosion protection through zinc-plated steel construction, extending service life in demanding environments
- Optimized drive engagement with Phillips No. 4 drive for efficient installation and reduced cam-out risk
- High mechanical strength delivering 60,000 psi tensile strength and Rockwell B73 hardness for reliable load-bearing performance
- Precision thread fit with Class 6g tolerance and M8 coarse thread for quick assembly and secure fastening
- Versatile pan head design with 16mm diameter providing excellent bearing surface and aesthetic appeal
- Full thread coverage along the 12mm length ensuring maximum grip strength in various material thicknesses
Professional Applications & Engineering Value
These M8 rounded head screws with internal-tooth lock washers address critical vibration-induced failure points in industrial equipment, automotive assemblies, and machinery frames. The zinc-plated steel construction provides essential corrosion resistance while maintaining the 60,000 psi tensile strength required for structural applications. The coarse thread (1.25mm pitch) enables rapid installation in both metallic and composite materials, while the Class 6g thread fit ensures consistent clamping force without binding. The combination of fully threaded design and pan head profile offers superior load distribution, making these fasteners ideal for applications where vibration resistance and reliable performance are paramount.
Specification Summary & Compliance
This metric screw features precise Class 6g thread tolerance with M8 x 1.25mm coarse threading and 12mm length. Manufacturing complies with ASME B18.13.1M standards for dimensional accuracy and performance. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial use.
