Anco Lock Nut

An Anco lock nut is a type of locknut with a ratchet pin that locks the nut in place. It is used to prevent loosening from vibration.

An Anco lock nut holds its position on a thread against vibration and is adjusted with a spanner. It takes a bolt or stud of the same thread and often a washer under the nut. The ratchet pin is set against the thread to resist loosening.

Hot-dipped galvanised is a zinc coating that gives good corrosion resistance for outdoor use. Plain finish means no coating is applied. PTFE coating is a dry film that reduces friction and gives some corrosion resistance.

This kind of locknut is often made in stainless steel. Stainless steel grades such as 316 give good corrosion resistance. It can be used in many environments.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance or a mill test certificate if you need to verify the material. On receipt, check the nut for correct thread size and the presence of the ratchet pin. Look for damage such as cracks or damaged threads.