Serrated (shakeproof) washers are meant to prevent the risk of attachments becoming loose when used in conjunction with a locknut.
These are available in both galvanised mild steel and stainless steel.
Plastic cable gland for non-armored round cables - ECP | Eaton
Capri ECP - Plastic industrial cable glands
Plastic cable gland for non-armored round cables - UNICAP | Eaton
Capri UNICAP - Plastic industrial cable glands
Plastic cable gland for industrial & residential - Capri EUROCAP | Eaton
Capri EUROCAP - Plastic industrial cable glands
Metallic industrial cable glands - Capri NEWCAP | Eaton
Capri NEWCAP - Metallic industrial cable glands
Glands for non-armoured cables - ISOCAP & NORMADIX | Eaton
Capri ISOCAP & NORMADIX - Metallic industrial cable glands
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