Serrated Washer - External - BA

4BA - Serrated Shakeproof Washer External - Self Colour - Pack of 50

Shakeproof washers are an anti-vibration type of locking washer. The surface of the washer features special teeth that lock when tightened, making them resistant to vibration. They are sometimes referred to as lock tooth washers.

On an external shakeproof washer the teeth are found on the outside rim of the washer.

Shakeproof washers are most commonly used in the electrical industry and are often used on larger fasteners where it does not matter so much if the teeth are visible.

BA thread (British association) is a rarely used thread that was once commonly found on small instruments and models. Still sparingly used in some industries such as metering equipment manufacturing and optical equipment.

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