Lappkabel skintop gmp gl m series locknut lappkabel 53119020 this hexagonal locknut is equipped with a special collar which prevents the screw wrench from slipping the plastic locknut has been glass fibre reinforced for maximum mechanical stability the supporting surface for spanner means scratches on the housing are avoidedskintop gmp gl locknuts are ul approved in connection with a ul approved skintop cable glandapplication for locking skintopreg cable glands in boreholes without t