External Tooth Lock Washer

DESCRIPTION:

An external tooth lock washer, also known as an external star washer or external serrated washer, is a type of washer used in various mechanical and fastening applications to prevent nuts, bolts, or screws from loosening due to vibrations or other external forces.

It has a distinct design characterized by serrated or toothed edges on one side of the washer.

Other names: external tooth washer, external star washer, external serrated washer

STRUCTURE:

The structure of an external tooth lock washer is relatively simple, but its design is crucial for its function in preventing fasteners from loosening due to vibrations or other external forces. Here are the key structural features of an external tooth lock washer:

1. Circular Shape: External tooth lock washers are typically circular in shape, similar to standard flat washers. The circular shape allows them to fit easily between a nut or bolt head and the mating surface.
2. Serrated or Toothed Edges: One side of the washer features serrated or toothed edges. These serrations are the defining feature of an external tooth lock washer. The serrations can vary in number and size depending on the specific design and size of the washer.
3. Smooth Backside: The opposite side of the washer, opposite the serrated edges, is usually smooth and flat. This side makes direct contact with the surface material, while the serrated edges grip the material and create friction.
4. Central Hole: Like a standard washer, an external tooth lock washer has a central hole through which the bolt or screw passes. This hole is sized to fit the fastener snugly without interfering with its rotation.
5. Material: External tooth lock washers are typically made from materials like steel, stainless steel, or other corrosion-resistant alloys. The choice of material depends on the application’s requirements and environmental conditions.

The serrated edges on one side of the washer are the critical feature that distinguishes an external tooth lock washer from other types of washers. These serrations dig into the surface material and create resistance to rotation, helping to prevent the nut or bolt from loosening over time.

When assembling a fastener with an external tooth lock washer, the serrated side should be placed against the surface material (e.g., metal, wood), and the smooth side should face the nut or bolt head. As you tighten the fastener, the serrations grip the material and resist any tendency for the fastener to rotate backward, thus providing a locking effect that helps maintain a secure connection.

SPECIFICATIONS:

• Diameter (M): M3-> M36 mm
• Material: Carbon steel ; Stainless steel 316/304/201
• Surface Finish: Black (plain/black); Electro-zinc-plated, Hot dip galvanized, Dacromet plated, Stainless steel 316/304/201
• Standard: DIN 6797, JIS/ ASMT/ ISO/ KS/ GB/ TCVN/ …

WORKING:

Here’s how an external tooth lock washer works:

1. Serrated Edges: One side of the washer has serrated or toothed edges, which are designed to bite into the surface of the material it is in contact with. This provides additional friction and resistance to rotation.
2. Locking Function: When the external tooth lock washer is placed between the nut or bolt head and the mating surface (such as metal or wood), the serrated edges dig into the material. As you tighten the nut or bolt, these serrations create friction and help prevent the fastener from turning and loosening unintentionally.
3. Vibration Resistance: External tooth lock washers are particularly effective at resisting vibrational forces that can cause nuts and bolts to come loose over time. The serrated edges provide continuous tension to counteract the effects of vibration.

External tooth lock washers are commonly used in industries like automotive, construction, machinery, and manufacturing, where maintaining secure and stable connections is crucial to safety and performance.

It’s essential to choose the right size and type of washer for your specific application to ensure effective fastener locking and prevent unintended loosening.

CONTACT INFO:

NAM AN INDUSTRIAL MATERIAL COMPANY LIMITED

Warehouse/Office address: No. 68, Van Canh Service Land, Hoai Duc District, Ha Noi City, Viet Nam.

Factory address: National Highway 5, Quy Duong, Tan Truong Commune, Cam Giang District, Hai Duong, Vietnam.

Hotline/Zalo: 0941 636 369 – 0983 344 163 – 0983 506 389

Email: Bulongocvitnaman@gmail.com

Website: https://en.bulongnaman.vn/

Youtube Channel: https://www.youtube.com/channel/UCVF6aCJCm1IiZABqXE2_KMw