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Mating surfaces harder than the washers.

Mating surfaces that are not locked in place (see left figure).

To optimize the load distribution for applications with large / slotted holes or with soft underlying surface, use a flanged nut / bolt together with Nord-Lock “SP” washers with enlarged outer diameter.ĭesigns where Nord-Lock washers are not recommended Nord-Lock washers safely lock the nut on stud bolts and eliminate the need for adhesives.Īpplications with large / slotted holes or soft underlying surfaces Keep the nut secure while tightening the bolt. Turn both fasteners in order to close the cams on both washer pairs before tightening to minimize settlements. the washers fit under the head of standard bolts.Īs for all locking washers, through-holes require two pairs of Nord-Lock washers – one pair for securing the bolt and a second pair for securing the nut. The outer diameter of regular Nord-Lock washers is designed for counterbore holes according to DIN 974, i.e.

Nord-Lock washers safely lock the bolt against the underlying surface.

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