S-90403A862 M4 x 8 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
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior vibration resistance through integrated internal-tooth lock washers that maintain clamping force in high-stress environments
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding industrial conditions
- Optimized drive engagement featuring Phillips No. 2 drive for efficient installation and reduced cam-out risk
- Reliable thread performance with Class 6g coarse threads ensuring consistent engagement and assembly accuracy
- High mechanical strength delivering 60,000 psi tensile strength and Rockwell B73 hardness for demanding applications
- Secure fastening solution combining pan head design with lock washer for permanent, vibration-resistant assemblies
- Full threading coverage along the 8mm length provides maximum grip and load distribution
Professional Applications & Engineering Value
These M4 metric screws with internal-tooth lock washers address critical vibration-induced loosening in industrial machinery, automotive assemblies, and electrical enclosures. The zinc-plated steel construction provides essential corrosion resistance for harsh environments, while the Class 6g coarse thread profile ensures rapid installation and reliable performance in high-volume production. The combination of fully threaded design and Rockwell B73 hardness creates a fastener capable of maintaining clamp load under dynamic stresses, making them ideal for applications where thermal cycling and mechanical vibrations would compromise standard fasteners. The pan head with Phillips drive offers both aesthetic appeal and practical installation efficiency for visible assemblies.
Specification Summary & Compliance
Manufactured to precise metric dimensions (M4 x 0.7mm pitch x 8mm length) with Class 6g thread tolerance for consistent fit. Complies with ASME B18.13.1M manufacturing standards and meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features include 8mm head diameter, 3.1mm head height, and integrated lock washer (8.58mm OD, 0.51mm thickness) manufactured from zinc-plated steel.
