Joint Guide
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Tapped holes
Nord-Lock X-series washers safely lock the bolt against the underlying surface.
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Counterbores
The outer diameter of Nord-Lock X-series washers is designed for counterbore holes (i.e., the washers fit under the head of standard bolts).
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Through-holes
As for all locking washers, through-holes require two pairs of Nord-Lock X-series washers — one pair for securing the bolt and a second pair for securing the nut.
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Stud bolts
Nord-Lock X-series washers safely lock the nut on stud bolts and eliminate the need for adhesives.
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Applications with large / slotted holes
To optimize the load distribution for applications with large/slotted holes, use a flanged nut/bolt together with Nord-Lock X-series “SP” washers with enlarged outer diameter.
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Designs where Nord-Lock X-series washers are not recommended:
- Mating surfaces that are not locked in place (see left figure)
- Mating surfaces harder than the washers
- Wooden mating surfaces
- Non-preloaded joints
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Selection Guide
Nord-Lock X-series washers are currently available in the following material:
| Application parameter: |
Steel |
| Steel type: |
EN 1.7225 or equivalent |
| Examples of applications: |
General steel applications |
| Washer types: |
Regular outer diameter
Enlarged outer diameter |
| Treatment surface coating: |
Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ) |
| Corrosion resistance: |
Minimum 1,000 hours in salt spray test (according to IS09227) |
| Bolt grades: |
8.8 and 10.9 |
| Temperature range: |
-40°C to 150°C
Temperature recommendations based on information from the raw material supplier. Locking function not affected within the specification.
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