Specification Sheet

12
Nord-Lock washers joint guide
Tapped holes
Nord-Lock washers safely lock the bolt against the underlying surface.
Stud bolts
Nord-Lock washers safely lock the nut on stud bolts and eliminate the need for adhesives.
Through holes
As 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.
Turn both fasteners in order to close the cams on both washer pairs before tightening to
minimize settlements. Keep the nut secure whilst tightening the bolt.
Counter bores
The outer diameter of regular Nord-Lock washers is designed for counter-bore
holes according to DIN 974, i.e. the washers fit under the head of standard bolts.
Applications with large / slotted holes or soft underlying surfaces
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.
Soft underlying surfacesLarge / slotted holes
If your application corresponds to one or more of the above mentioned design criteria, contact
your Nord-Lock representative and we will help you find an alternative solution.
Designs where Nord-Lock washers are not recommended
• Mating surfaces that are not locked in place (see left gure)
• Mating surfaces harder than the washers
• Very soft mating surface, e.g. wood, plastic
• Applications with extremely large settlements
• Non-preloaded joints