INTERNAL TOOTH WASHER

An INTERNAL TOOTH WASHER is a locking washer with radial teeth formed around the inner hole. It may also be referred to as an internal tooth lock washer. When tightened, the internal teeth engage with the screw shank or mating surface, increasing frictional resistance. It is suitable for compact assemblies and applications where the available outside-diameter space is limited.

Product Name: INTERNAL TOOTH WASHER / Internal Tooth Lock Washer
Product Structure: Radial teeth arranged around the inner hole
Primary Functions: Provides auxiliary anti-loosening, increases friction, and helps distribute fastening pressure
Applicable Fasteners: Screws, bolts, and small mechanical assemblies
Inner Diameter: Selected according to the size of the matching screw or bolt
Outside Diameter: Standard dimensions or as specified by drawing
Number and Profile of Teeth: Manufactured according to size, engagement, and anti-loosening requirements
Materials: Spring steel, carbon steel, stainless steel, or other specified materials
Surface Treatments: Zinc plating, nickel plating, black oxide, passivation, or other specified finishes
Applicable Standards: DIN, JIS, ANSI, or customer-specified standards
Production Methods: Stamping and heat treatment
Production Options: Standard specifications or custom production based on drawings
Packaging: Bulk packing, bag packing, box packing, or customized packaging upon request

Provides Auxiliary Anti-Loosening Performance

After tightening, the internal teeth engage with the mating surface and increase frictional resistance, helping reduce the possibility of reverse rotation under general vibration conditions.

Teeth Concentrated Around the Inner Diameter

The teeth are located around the inner hole, leaving the outer edge relatively smooth. This makes the washer suitable for assemblies with limited outside-diameter space or where a cleaner appearance is preferred.

Improves Contact Stability

The elastic teeth compress under load and help maintain contact pressure while compensating for minor surface irregularities or small dimensional variations in the assembly.

Can Penetrate Surface Coatings

The internal teeth can bite into or scrape through localized oxide layers, paint, or surface coatings, helping establish electrical contact between metal components. This makes them commonly used in grounding applications.

Suitable for Small Component Assemblies

INTERNAL TOOTH WASHERS have a compact structure and are commonly used in electronic and electrical equipment, machinery, home appliances, automotive and motorcycle components, and enclosure assemblies.