Nord-Lock Group DE_SC-Keilsicherungsscheiben

Nord-Lock washers for building and construction applications

Only Nord-Lock wedge-locking washers have building authority approvals for all common bolted connections in steel construction. Regardless of whether it is a preloaded or non-preloaded bolted connection, HV or SB set, through bolting, blind bolting or threaded rod with nut. Our steel construction experts will be happy to help you with your choice!

NORD-LOCK SC WASHERS IN THE JUNKER TEST

The Junker test (according to DIN 65 151) is the most severe vibration test for bolted joints. It is used to compare different securing methods under transverse displacements while continuously measuring the clamping force between the structural parts. The preload is crucial to hold the parts together and prevent loosening - otherwise the bolted joint would fail.

We will be happy to send you the following documents on request:

General building authority approvals:

ETA-19/0813: Nord-Lock wedge-lock washers for non-preloaded bolted connections (DIN EN 15048)
ETA-20/0010: Nord-Lock SC wedge-lock washers for (scheduled) preloaded bolted joints (DIN EN 14399-4/-8)
Declaration of performance – DOP

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Why Nord-Lock washers

10 reasons that speak for Nord-Lock

Dynamic loads: Alternating or shock loads, vibration, temperature

Standards recommend or prescribe locking elements

Preload alone is no guarantee of adequate locking function

Other securing methods are ineffective (e.g. double nut, thread punching, pal nut, etc.)

Maintains the preload (design principle of a bolt)

Prevents the bolting components from falling apart

Conform securing element (ETA, abZ, EBA)

Reduction of maintenance activities and costs

Easy to use (replace flat washer with Nord-Lock)

Lifetime warranty on the securing function

BRIDGE DESIGN, CONSTRUCTION AND MAINTENANCE

In Europe, many bridges are part of an aging infrastructure that was built in the mid-20th century. As a result, existing bridges must be maintained, as well as new ones built to better accommodate increasing traffic. History, regional preferences, and bridge type are important factors that influence the joining methods to be used when building and maintaining bridges.