User manual for Nord-Lock Original Washers covering working principle, joint guide, assembly, product selection, and torque guidelines.
Nord-Lock Original Washers are a pair of washers with cams facing each other and serrations gripping the mating surfaces. They use cam geometry to prevent bolt loosening, with a wedge-locking effect created because the cam angle is greater than the thread pitch.
The manual includes a joint guide for tapped holes, through holes, counterbores, stud bolts, and special surfaces, plus assembly instructions, product selection by material and size, and torque guidelines for steel washers.
| Steel material standard | EN 1.7182 |
|---|---|
| Steel hardness | ≥ 465HV1 |
| Steel corrosion resistance | Minimum 1,000 hours in salt spray test |
| Steel temperature range | -50°C to 200°C |
| Steel bolt grades | Up to 12.9 |
| Stainless steel bolt grades | Up to A4-80 |
| Steel size range | M3–M130 |
| Steel coating | Delta Protekt KL100 zinc flake coating with VH 302 GZ top coat |
| Storage temperature | -15°C to 25°C (5°F to 77°F) |
| Adhesive compliance | 21 CFR 175.105 |
| Torque guideline status | Indicative general guidelines |
The cam angle is greater than the thread pitch, creating a wedge-locking effect that secures the fastener.
Through holes require two pairs of Nord-Lock washers.
Lubricate the thread and the area under the head prior to installation.
Use a flanged nut or bolt with Nord-Lock sp washers, or X-series washers for very soft materials.