{"id":2853,"date":"2026-06-22T16:53:02","date_gmt":"2026-06-22T14:53:02","guid":{"rendered":"https:\/\/www.efsfasteners.com\/products\/nuts\/industrial-crown-nuts\/"},"modified":"2026-07-17T16:13:17","modified_gmt":"2026-07-17T14:13:17","slug":"industrial-crown-nuts","status":"publish","type":"page","link":"https:\/\/www.efsfasteners.com\/en\/products\/nuts\/industrial-crown-nuts\/","title":{"rendered":"Industrial Crown Nuts"},"content":{"rendered":"

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PRODUCTS<\/a> | NUTS<\/a><\/p>\n<\/div>

Industrial Crown Nuts<\/h1><\/div><\/div><\/div>
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Castellated nuts are fastening components designed to prevent accidental loosening of the connection through the use of a safety cotter pin. Their distinguishing feature is the presence of slots in the upper part of the nut which, once aligned with the hole in the shank of the screw or pin, allow the cotter pin to be inserted. <\/p>\n

This mechanical locking system is used in applications where fastening safety is a priority requirement and where vibration, alternating loads or dynamic stress could compromise tightening stability over time.<\/p>\n

Although they are less widespread than modern self-locking systems, castellated nuts continue to be used in many industrial sectors thanks to the simplicity of the system and the possibility of visually checking that the connection has been correctly locked.<\/p>\n<\/div><\/div><\/div>

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Characteristics of Crown Nuts<\/h2><\/div>

The function of a crown nut is not to generate additional friction on the thread, but to allow positive mechanical locking through a cotter pin.<\/p>\n

After tightening, the slots of the nut are aligned with the transverse hole in the pin or screw. The cotter pin is then inserted and bent, preventing any unwanted rotation of the nut. <\/p>\n

This system offers high safety against loosening, easy visual inspection of the assembly and reliability that is particularly valued in applications subject to vibration and dynamic loads.<\/p>\n

On the other hand, it requires specifically designed components with through holes and generally longer assembly times compared to other locking solutions.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

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Industrial Applications of Crown Nuts<\/h2><\/div>

Crown nuts are mainly used on pins, axles and connections subject to continuous movement or vibration.<\/p>\n

They are particularly common in agricultural machinery, earthmoving equipment, lifting systems, railway applications and many types of industrial equipment where the fastening system must be easy to inspect during maintenance activities.<\/p>\n

The presence of the cotter pin allows immediate verification that the connection has been correctly locked, a characteristic that continues to make them a valued solution in many mechanical applications.<\/p>\n

In many projects, the crown nut is chosen not so much for economic reasons, but for specific design requirements that call for a mechanical safety system independent of thread friction.<\/p>\n<\/div><\/div><\/div>

UNI and DIN Standards<\/h2><\/div>

Crown nuts are manufactured according to standards that define the dimensions and geometries of the component.<\/p>\n

The main reference standards are:<\/p>\n