Nord-Lock Ltd

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- YEAR FOUNDED

Joining parts together is one of the most critical steps when delivering a product or a system. The Nord-Lock Group is focused on solving the toughest bolting challenges.

We offer a unique combination of bolting expertise and a wide product range, including wedge-locking technology and Superbolt tensioners, all designed and developed in-house.

Nord-Lock holds decades of documented success in every major industry including oil & gas, energy, transportation and mining. Our Production System includes rigorous internal testing and full traceability. Our products hold several certificates from independent institutes including AbP, ABS, DIBt, DNV and TÜV.

The tools available through Nord-Lock Performance Services add value throughout a project and ensure that your bolting application pays back multiple times. We can also assist you in the design phase with joint simulation and testing. Additionally, we help you ensure successful operations over time with our on-site support and remote product training.

Our mission is to safeguard human lives and customer investments by securing the world’s most demanding applications. The Nord-Lock Group looks forward to being your partner in bolt optimization.
 

Nord-Lock wedge-locking technology

The Nord-Lock bolt securing system uses geometry to safely lock bolted joints in the most critical applications. Over the years, Nord-Lock washers have been rigorously tested and approved by independent institutes as well as certification authorities. Each batch is assigned a control number which ensures full traceability down to first assembly. Nord-Lock products help you increase your profitability by considering the complete life cycle cost for bolt securing.

The Nord-Lock Principle

Nord-Lock washers secure bolted joints with tension instead of friction. The system is comprised of a pair of washers that has cams on one side and radial teeth on the opposite side. Since the cam angle ”α” is greater than the thread pitch ”β” a wedge effect is created by the cams, preventing the bolt from rotating loose.

Nord-Lock wedge-locking technology

Nord-Lock washers

The Nord-Lock bolt securing system uses geometry to safely lock bolted joints in the most critical applications. Over the years, Nord-Lock washers have been rigorously tested and approved by independent institutes as well as certification authorities. Each batch is assigned a control number which ensures full traceability down to first assembly. Nord-Lock products help you increase your profitability by considering the complete life cycle cost for bolt securing.

This unique wedge-locking system offers:
• Maximum safety
• Resists loosening caused 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

Nord-Lock washers

The Nord-Lock wheel nut

The Nord-Lock wheel nut safely secures wheels on on-road and off-road heavy vehicles by maintaining high clamping force even under extreme operating conditions.

When assembled correctly, the Nord-Lock wheel nut cannot loosen by itself. It represents a simple and cost effective way to make wheels safe and secure more productive and efficient operations. The Nord-Lock wheel nut is designed for flat-faced steel rims.

The Nord-Lock wheel nut

The Nord-Lock combi bolt

The Nord-Lock combi bolt is a bolt with an integrated pair of Nord-Lock washers. With the Nord-Lock combi bolt, you will be able to increase the efficiency, accuracy and safety of your assembly, while at the same time keeping inventory and part count at a minimum.


Based on our proven wedge-locking technology, the Nord-Lock combi bolt secures bolted joints and maintains a high clamp force even under severe operating conditions.

The Nord-Lock combi bolt

Superbolt technology

Superbolt multi-jackbolt tensioners (MJTs) is an ideal solution for larger size nuts and bolts. MJTs are designed as direct replacements for conventional nuts and bolts. Instead of having to generate enough torque to tighten an entire hex nut, MJTs break those torque requirements down by utilizing a series of hardened jackbolts threaded through the body of a round tensioner. This enables the user to generate the needed clamping load while using only hand or air tools for installation and removal.

The Superbolt Principle

To install, you first place the hardened washer over the stud or bolt and then thread the tensioner on, hand tight. With simple hand tools, the jackbolts are tightened uniformly. This creates a thrusting of the nut body away from the washer surface (axial force), creating bolt tension and imparting a stretch on the main thread. MJTs flex slightly, adding elasticity to the system which helps keep the joint tight, even when there are temperature changes and fluctuating loads. Common problems such as stud seizure and thread galling are greatly reduced as MJTs are tightened in pure tension.
 

Superbolt technology

Superbolt nut-style tensioners

Nut style multi-jackbolt tensioners are an innovative bolting product that will eliminate expensive and dangerous tooling. Only hand/air tools are required to install or remove any size MJT.

Superbolt nut-style tensioners

Superbolt bolt-style tensioners

Superbolt bolt-style tensioners are used in a wide variety of applications where a nut-style tensioner and stud combination does not fit or is not the preferred solution.

Incorporating multi-jackbolt technology into a bolt:
• Has all of the preload and low torque advantages of the MJT nuts.
• Requires less head diameter and therefore less space than nut-style MJTs.
• Reduces the number of parts versus stud and nuts.
• Small head dimensions can fit into tight countersinks or space restrictions.
 

Superbolt bolt-style tensioners

Superbolt flexnuts

For through hole applications we have developed the Superbolt Flexnut, which is a reactive nut that is able to flex elastically. Putting a Flexnut gives the same advantages as the MJT on the reactive side. Under load they flex at the bottom and at the top. This helps relieve stress concentrations and increases the fatigue life of the stud/bolt. Since Flexnuts are reactive nuts to be used opposite our tensioners, they are never torqued directly to achieve preload.

Advantages with Superbolt Flexnuts:
• Under load they ensure an equal load distribution on the thread of the bolt / stud.
• Adds elasticity in the joint.
• Increases the fatigue life of the bolt / stud.
 

Superbolt flexnuts

Nord-Lock Performance Services

The Nord-Lock Group offers continuous support; from design phase, testing and verification, through installation and maintanance. Nord-Lock Performance Services is a partnership project offered to key customers. The purpose is tp increase profitability by generating a complete and detailed view of the design of bolted connections and securing methods. As each project is designed to meet customer specific needs and challenges, both current applications and future designs can be investigated.

The Nord-Lock Group includes subsidiaries, in-house laboratories on three continents, and a worldwide network of authorized distributors. Every day our international team of sales engineers visits clients locally. We are dedicated to help you optimize your bolted joints in order to minimize overall cost and maximize safety.

Nord-Lock Performance Services
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