What are Metric Nord Lock Washers?

Nord Lock washers are a pivotal component in our precision locking washers range, renowned for their unique design and capability to prevent loosening under vibration and dynamic loads. These washers utilise a wedge-locking technology consisting of a pair of washers with cam faces on one side and radial teeth on the opposing side with a greater angle than the threads.

When a bolt and nut assembly is secured with a Nord Lock Washer, the cams on the washers engage, allowing the assembly to maintain high preload, thus securing the bolt against any rotational movement that could lead to loosening.

Nord-Lock wedge washers are renowned for surviving the DIN 65151 junker test, commonly seen as the most rigorous method for testing bolted joints. This test involves the exposure of the fastening to extreme vibrations, continually monitoring the clamping force of the fasteners to assess anti-vibration capabilities under transverse movements.

How Nord-Lock Washers Work.

Understanding how to use Nord-Lock washers reveals their versatility across various industries including aerospace, energy, and manufacturing. The principle behind these washers is simple yet effective: when subjected to load, the interaction between the cams and the radial teeth creates a wedge effect, increasing the preload, which effectively counters the tendency of the bolt to rotate.

For instance, in wind turbines, where consistent vibration is a challenge, Nord Lock washers ensure that critical connections remain intact, enhancing operational reliability and safety.

Nord Lock Washer Materials.

Accu's range of Nord Lock washer materials are available in A4 Stainless Steel and Hardened Steel. Each material is chosen for its specific properties to suit different environmental and operational needs.

Nord Lock stainless steel washers are ideal for applications requiring corrosion resistance and durability, particularly in marine and outdoor environments. Hardened Steel, on the other hand, offers superior strength and is preferred in heavy-load applications where the structural integrity of components is paramount.

Nord Lock Washer Sizes & Types Available.

Nord Lock washer dimensions come in a comprehensive range from the smallest inner diameter of M3 up to a robust M130, catering to a broad spectrum of engineering needs. We also stock imperial variants ranging from 1/4 inch to 1 inch.

In terms of finishes, these washers are available with a standard finish or a Nord Lock Delta Protekt zinc flake coating, which provides enhanced corrosion protection—an excellent choice for harsh environments. Each washer is meticulously engineered to exact dimensions, ensuring a perfect fit and optimal performance for every application.

By integrating Nord Lock wedge washers into your assemblies, you're engineering a future defined by durability and reliability.

FAQs.

Q: Can Nord-Lock washers be reused?.

A: Our customers often ask, "are Nord Lock washers reusable?" Yes, Nord-Lock washers are designed to be reusable. The integrity of their locking mechanism remains effective through multiple uses, making them a cost-effective solution in applications where frequent maintenance is required. However, it is essential to inspect them for wear and damage before reuse to ensure optimal performance.

Q: When should you not use a Nord-Lock washer?.

A: Nord-Lock washers should not be used when the contact surfaces are uneven, as irregularities can impair the functionality of the locking mechanism. Additionally, they are not recommended for use with soft metals or plastics where the washer might embed itself into the material, thereby reducing its effectiveness.

Q: Are Nord-Lock washers any good?.

A: Absolutely! Nord-Lock washers are highly regarded for their ability to maintain high preload and prevent loosening in bolted joints under severe vibration and dynamic loads. Their unique wedge-locking mechanism ensures that the bolted assembly remains secure, making them a superior choice for critical applications across various industries.

Q: What is the difference between a Nord-Lock washer and a split washer?.

A: The main difference lies in their locking mechanisms. Nord-Lock washers use a wedge-locking system that secures the fasteners under preload, preventing them from loosening under vibration. Split washers, or spring washers, apply a spring force between the head of the bolt and the substrate. While spring washers can deter loosening through friction, they are generally less effective than Nord-Lock washers in dynamic, high-vibration environments.

Q: Nord Lock washer vs spring washer, which is best?.

A: The choice between a Nord Lock washer and a spring washer largely depends on the application. Nord Lock washers are superior in environments that involve significant vibration and dynamic loads, offering enhanced reliability and safety. Spring washers may be suitable for applications where vibrations are minimal and the cost is a critical factor. However, for most critical or high-load applications, Nord Lock washers are often the best choice due to their robust locking capability and durability.

Bespoke Metric Nord Lock Washers Manufacture.

High precision, bespoke manufacture of Metric Nord Lock Washers to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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