The seal blocks out water and bacteria and also prevents a non-hygienic metal-to-metal assembly.
The design of the nuts does not deviate from the sizes of current standard nuts. Therefore, wrench sizes, thread heights etc. all remains the same making it very easy to upgrade and replace standard nuts. This is the right choice of nuts to be used on all machinery in all certified hygienic wash-down environments.
The nuts have self-draining surfaces with a maximal roughness of 0.8 pm Ra.