Definition

Noun: A lock washer is a specific type of washer (a thin, flat ring) designed to prevent a nut or bolt from loosening due to vibration or rotation. It functions by applying a spring force or by having teeth that bite into the fastener and the surface of the material.

Usage

A lock washer is used in mechanical assemblies where secure fastening is critical. It is placed between the nut (or bolt head) and the surface of the material being fastened. Its primary purpose is to maintain tension and prevent the fastener from becoming loose.

Examples

• The mechanic installed a lock washer under the nut on the wheel assembly to ensure it wouldn't vibrate free.
• For the high-vibration environment of the engine, using a lock washer is essential.
• Always check if the design specification requires a standard washer or a lock washer.

Advanced Usage

• Split-ring lock washer: A common type, which is a ring split at one point and twisted so the ends are offset. This creates a spring action that keeps the nut tight.
• Toothed lock washer: A type with internal or external teeth that dig into the fastener and the work surface to prevent rotation.

Variants and Related Words

• Washer: The general term for a flat ring used to distribute load or act as a spacer.
• Nut: The fastener that a lock washer often secures.
• Bolt: The threaded fastener used with a nut and washer.

Synonyms

• Spring washer (This is a broader category that includes lock washers, but the terms are often used interchangeably for common split-ring types.)

Notes

The term "lock washer" specifically refers to the washer's function of locking the fastener. It is a compound noun where "lock" modifies "washer" to specify its type.

Noun

1. washer that prevents a nut from loosening