Specification Sheet

Nord-Lock washers are easy and effective to use while

ensuring structural security for applications exposed to

vibration and dynamic loads.

Installing the washers

The pre-assembled washers are installed in pairs, cam face to

cam face. Nord-Lock recommends lubrication when possible.

Tightening

Tighten Nord-Lock washers with standard tools according

to the guidelines (on page 9-11). Tightening guidelines for

other bolt grades are available through your Nord-Lock

representative.

Untightening

Untightening Nord-Lock washers is as simple as tightening.

Note that since the locking function is not based on increased

friction, the untightening torque is generally lower than the

tightening torque. Therefore it is not possible to measure off-

torque as veriﬁcation of locking function.

Reusing Nord-Lock

Nord-Lock washers can normally be reused. As with

all fasteners, they should be inspected for wear before

reassembly. Make sure that the washers are reinstalled

correctly cam face to cam face. Nord-Lock recommends

lubrication of fasteners before reuse in order to minimize

changes in friction conditions.

Using Nord-Lock

washers

When the two criteria above are met, you have veriﬁed

the locking function of the Nord-Lock washers.

Utilize the advantages of lubrication

Nord-Lock recommends the use of a high quality, anti-seize

lubricant as it improves the tightening results. It is especially

beneﬁcial for large sized bolts and stainless steel applications.

The Nord-Lock wedge-locking function provides safe locking

in both dry and lubricated conditions. Beneﬁts of lubricated

fasteners include:

• Improved reusability

• Reduced friction and deviation

• Facilitated assembly and disassembly

• Reduced torsion stress due to minimized thread friction

• Avoided galling and thread seizure

• Additional protection against corrosion

When untightening a bolt secured by Nord-Lock washers,

check that sliding occurs between the cam faces.

After disassembly, impression marks must be visible on

both the fastener and the contact surface.

Possible to verify the locking function