Steel Construction Washers

Nord-Lock created the original wedge-locking technology that secures bolted joints, even when exposed to severe vibration and dynamic loads. It is impossible for our products to loosen unintentionally due to the wedge created underneath the bolt head and nut.

Steel Construction Washers

Nord-Lock steel construction (SC) washers are specially designed to fit both HV and HR bolts and nuts, and directly replace standard plain chamfered washers (EN 14399-6).

In order to ensure an optimal contact surface between the bolt and the washer, each SC-washer pair has chamfers on the inner diameter. Since the chamfer is present on both sides of each pair, it eliminates the risk of incorrect installation of the washer.

Nord-Lock steel construction washer promises the highest corrosion resistance in the market, it is tested at least 1,000 hours in the Neutral Salt Spray Test.

Washer Specifications

Material Steel 1.7182 or equivalent
Hardness HV1 > 465 HV through hardened
Surface coating Zinc flake coated free of cadmium + chrome VI
Available range M12 – M36 (NL12SC – NL36SC)



  • Prevents loosening caused by vibration and dynamic loads
  • Quick to install and remove using standard tools
  • Easy and safe installation on HV bolts due to double sided chamfer
  • Locking function not affected by lubrication
  • Defined and uniform friction condition, which results in less deviation of achieved preload
  • Same temperature characteristics as standard bolt / nut
  • Reusable
  • High corrosion resistance
  • Reliable locking, even for joints with short clamp length

Testing & Certification

Nord-Lock SC-washers have been rigorously tested and approved by independent institutes as well as certification authorities. They are CE-marked for use with HV sets. Their safe usage with high strength bolts has also been confirmed by the National Technical Approval No. Z-14.4-629 and by the European Technical Approval ETA-13/0246 issued by DIBT.

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