SKF lock nuts with a locking washer or clip have four (fig 1) or eight (fig 2) equally spaced slots respectively, around the outside diameter to take a hook or impact spanner. The designations of the appropriate spanners are provided in the product tables.

The nut and the locking device must be ordered separately. The appropriate locking washer or clip

KM(L) lock nuts with locking washer

Lock nuts in the KM and KML series are available for metric ISO threads up to and including 200 mm and are locked with an MB(L) washer (fig 3) or with the stronger MB .. A design.

KML lock nuts have the same thread and width as the corresponding KM nuts with the same size code, but a smaller outside diameter.


HM(E) lock nuts with locking clip

Lock nuts in the HM(E) 30 and HM 31 series with metric trapezoidal threads are locked by an MS locking clip consisting of the clip, a hexagon headed bolt to EN ISO 4017:2000 and a spring locking washer to DIN 128 (fig 4).

For easier handling, lock nuts from sizes HM 3168 resp. HM 3088 and above have a threaded hole in the outside diameter to fasten an eyebolt.


N and AN lock nuts with inch dimensions

Lock nuts with inch dimensions are available both in the light N 0(00) series and in the heavy N (00) and AN (00) series. Up to and including size 44 they are locked with washers (fig 3). Larger nuts are locked with locking plates (fig 5). N 0(00) lock nuts have the same thread and width as the corresponding N or AN nut with the same size code, but a smaller outside diameter.