Internal Tooth Lock Washer

The internal tooth lock washer is an annular washer with a toothed structure on the inside that can be embedded into the surface of the connector to better fix and prevent loosening.

Size

Internal tooth lock washer come in standard metric (following ISO 7080) and imperial (following ANSI B18.21.1) sizes. Metric sizes range from M3 (3mm inner diameter) up to M24, while imperial sizes go from 1/4" to 1" in diameter. Thicknesses vary between 0.5mm and 3mm. If you need something special for unique equipment, custom sizes are available to fit different bolt diameters and head shapes.

Choose the right size for internal tooth lock washer: If the washer is too big, it weakens the clamping force; too small, and the teeth might not grip properly. We can provide clear charts to help you match the washer’s dimensions to your bolt’s specs, so you know it’ll fit right.

Surface treatment

Internal tooth lock washer get surface treatments like zinc plating, phosphate coating, or hot-dip galvanizing to work better. Zinc plating adds a layer that fights rust, and phosphate coatings help the washer hold oil and create more friction for a tighter grip. In tough environments,like places that are really wet or have chemicals,stainless steel or passivated finishes offer better rust protection. Electroplated or mechanical coatings also stop parts from sticking together during installation, making it smoother. These coatings help the washers last longer and keep their teeth gripping well, even in humid or corrosive conditions.

Choose stainless steel or carbon steel?

Q:  How do I choose between stainless steel and carbon steel internal tooth lock washer?

A: Stainless steel internal tooth lock washer don’t rust easily and work well in tough environments like marine or chemical industries. Carbon steel ones are stronger and cheaper for dry, non-corrosive places. Pick the type based on where you’ll use them (environment), how much weight they need to hold, and your budget,just make sure they fit with the bolts or nuts you’re using.