Home > DNV approved Nord-Lock washers available from Alice Bolt Supplies

DNV approved Nord-Lock washers available from Alice Bolt Supplies

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article image Nord-Lock washers

Nord-Lock washers are available from Alice Bolt Supplies , Darwin Bolt Supplies and NQ Fasteners & Lifting.

Nord-Lock washer is an advanced bolt securing system that provides safe locking for bolted joints even when exposed to severe vibration and dynamic load.

The Nord-Lock bolt securing system is comprised of ideal cam faced washers that are assembled as washer pairs.

Nord-Lock washers have been manufactured by Nord-Lock AB in Mattmar, Sweden since 1982. Customers benefit by using Nord-Lock, because it is designed for a bolted joint in critical applications.

Advantages include:

  • Maximum safety
  • Not affected by vibration and dynamic loads
  • Ease of assembly and disassembly
  • Locking function is not affected by lubrication
  • Positive locking at low and high preload levels
  • Controllable preload
  • Same temperature characteristics as standard bolt / nut
  • Reusable

DNV Type Approval Certificate
The independent foundation DNV (Det Norske Vertitas) has type approved Nord-Lock locking washers. The certification process took over two years and included independent tests (vibration test according to DIN 65151 and accelerated vibration test according to NASM 1312-7). Moreover; Nord-Lock's production and quality assurance system was thoroughly investigated.

DNV recommends Nord-Lock for preloaded bolted assemblies subjected to dynamic, fatigue, impact and vibration induced loading.

The type approval certificate ensures that Nord-Lock complies with the following:

  • DNV's "Rules for certifications of lifting appliances", September 1994
  • DNV's offshore Standard DNV-OS-C101 "Design of offshore steel structures" October 2000
  • DNV's offshore standard DNV-OS-E101 "Drilling plant" October 2006
  • DNV's offshore standard DNV-OS-E201 "Hydrocarbon production plant", October 2000

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