Specification Sheet

3
Nord-Lock washers are proven as a safe bolt securing system
according to DIN 65151 tests performed by the independent
research organizations IMA and CETIM. In addition,
Nord-Lock personnel performs over 10,000 live Junker
vibration tests around the globe every year. Would you like
to see a live demonstration? Find your nearest representative
through www.nord-lock.com/contact
Fig 2: Drawing of the test rig. The assembled parts are vibrated vertically
and the joints are subjected to two impacts per cycle. The impacts are
parallel to the bolt. The arrow displays the direction of vibration during the
test. After testing, the fasteners are inspected for rotation.
Load cycles
Untightening
Clamp load [kN]
Regular nut M8 on bolt with Nord-Lock
at 70% of yield point
Regular nut M8 on bolt with extension
socket, clamp length 50 mm
Nylon-inserted nut
Split ring
Regular nut M8 on bolt
Proven in Junker vibration test
The Junker test, according to DIN 65151, is considered the
most severe vibration test for bolted connections. During the
test, the joint is exposed to transverse movements underneath
the bolt head / nut, while the clamping force is continuously
measured.
Proven according to NASM impact & vibration test
The National Aerospace test, according to NASM 1312-7, is a
test method originally developed by the U.S. military to test
bolted connections’ resilience against impact and vibration.
Fig 1: The Junker test shows that Nord-Lock washers safely secured
the bolted connection; only a limited amount of tension is initially
lost due to normal settlements. The wedge-locking function is
verified through the clear increase in tension during untightening. All
other bolt locking methods in the test failed to prevent loosening of
the joint.
Nord-Lock washers are proven as a safe bolt securing
system according to NASM 1312-7 tests performed by the
independent organization Det Norske Veritas (DNV). If you
wish to perform your own real-life testing and evaluation
of Nord-Lock washers for your application, you can order
samples through www.nord-lock.com/contact
Vibration test
Bolt M8 (8.8) with clamp length 25 mm
Over the years, Nord-Lock washers have been rigorously tested and approved by independent
institutes as well as certification authorities.
Proven and certified by TÜV
Nord-Lock washers have been certified for
safety and quality by TÜV, a leading
international institute in quality and safety
certification. In a two-step process, TÜV
monitored and successfully approved both
Nord-Lock washers and Nord-Lock’s
production facilities.