Serrated Lock Washer External Teeth For Assembly

Serrated lock washer external teeth for assembly get special coatings to work better. Common coatings include zinc plating (blue or clear) to fight rust, phosphating to increase friction, and black oxide to keep the appearance consistent. Electro-galvanized ones have a smooth surface, while hot-dip galvanizing gives the best rust protection for outdoor use. Passivated stainless steel types keep their shiny look in harsh environments. Coatings like nickel or cadmium are used for specific industrial needs. These surface treatments don’t just make the washers last longer—they also improve their grip by adjusting the surface texture.

Size

Serrated lock washer external teeth for assembly come in metric (M3 to M24) and imperial (#4 to 1") sizes, so they work with many different bolt thicknesses. The standard thickness is between 0.5mm and 3mm, and the outer diameter changes to match the thickness. The number of teeth (16 to 32) and their angle (60 to 90 degrees) are designed to spread the load evenly. If you need special sizes for unique machinery, they can be made custom. They follow standards like ASME B18.21.1 and ISO 7040, and each washer has a mark for tracking. Engineers pick the right size based on how much clamping force is needed and the thickness of the material, making sure the washer fits the project’s needs perfectly.

Be reused after initial installation?

Generally, you shouldn’t reuse serrated lock washer external teeth for assembly. When you install them, the teeth bend a bit to grip tightly, and using them over and over can make them lose their springiness and ability to lock properly. Old washers that have been reused might not hold tension well, which can cause the load to spread unevenly or make the fastener come loose. Always check the teeth for wear or flattening,if they look damaged, toss the washer and use a new one.

In critical applications such as aerospace or automotive, it is important to monitor the condition of serrated lock washer external teeth for assembly and replace them in a timely manner. Using new external tooth lock washers can maintain stable performance and ensure compliance with safety standards.