1: Size and grade "Select the correct combination of bolt size and grade"
For bolt applications, the larger the size, the better. Similarly, high-grade bolts do not imply performance improvements over low-grade bolts. The combination of the two is the key.
Bill Eccles, founder of boltscience.com, said: "If everyone can choose the right bolt size and material, no additional bolt safety solution is needed."
Eccles explained that the bolt size and strength class can have both positive and negative effects on the bolt load. If the ideal combination can be found and the bolted joints are properly tightened, this load becomes an important factor in ensuring a secure bolted connection. He said: "You can choose a bolt with a larger size but a lower strength rating, or a bolt with a smaller size but a higher strength rating. Both options may be appropriate." When considering such critical design choices Problems, Nord-Lock engineers can provide useful help.
2: Loose bolts "create elastic force for joints and eliminate loose bolts"
Thread slack is one of the main reasons for loose bolts. There are three main reasons for the looseness of the thread: rough or irregular surface settlement; slack, that is, the polymer or composition becomes compact; creep, that is, the displacement or deformation of the material under the action of stress and high temperature. These three reasons can cause loss of preload, resulting in problems with the bolt joint.
Today, bolted joints are subject to higher temperatures and loads, and more and more equipment components are made of synthetic materials, plastics and aluminum, which is why thread loosening is increasing.
According to Robin Senn , sales engineer at Nord-Lock Switzerland , there are two aspects to solving this problem: "To avoid loose threads, the surface of the screws needs to be smooth and hard, and the elasticity of the bolt joints should be increased, for example, using Nord-Lock X- Series washers or Superbolt multi-push pretensioners."
Superbolt multi-push pretensioners and Nord-Lock 's multi-function wedge lock technology increase joint flexibility and minimize thread slack.
3: Bolt lubrication "Select the correct lubrication method"
For bolted connections, how to emphasize lubrication can not be overstated. Lubrication minimizes frictional irregularities while reducing torque load ratios. Lubrication also makes installation and removal easier and extends bolt life.
Hidenori Araki , field application engineer at Nord-Lock USA, recommends that lubricant be applied to the bolt head or nut and the screw portion of the bolt.
“For bolt lubrication, it is important to choose the right lubrication method for the application. Some of the parameters that should be considered include: chemical composition, health and environmental impact, operating temperature range and coefficient of friction, and should consult the lubricant manufacturer. How to use."
4: Design / Maintenance "focus on life cycle cost"
In the project design phase, a common challenge is whether you should choose a low-cost solution to keep current costs to a minimum, or should you choose a high-quality solution to achieve long-term cost savings?
Martin Lindbäck, director of the R&D project management office at Siemens Industrial Turbine, said: "Initial costs should not be the only focus of consideration. Making smart investments early in the project can result in significant cost savings in the later stages. This approach also helps to improve customer satisfaction. degree."
When Siemens chose a bolt safety solution for its multi-million euro gas turbine, it adopted a strategy that focused on long-term cost savings and utilized Nord-Lock 's lock washers and Superbolt pretensioners. Finally, not only does the cost savings during the installation phase, but also the maintenance costs are greatly reduced over the life of the turbine.
5: The coating "coating makes the bolt connection more secure"
The coating thickness may be only a few microns, but it can improve the performance of the fastener in a number of ways, including resisting corrosion, reducing friction, and enhancing the appearance. A wide range of coating solutions are available, with galvanizing being the most cost effective and simplest. If the method does not achieve satisfactory results, a zinc alloy can also be used. If more protection is needed, multi-layer zinc chip treatment is recommended.
Which coating should I choose for a specific application? Csaba Madru , a global oil and gas application engineer at Nord-Lock , believes that the characteristics of some coatings should be prioritized: "The coating should first be selected according to the degree of corrosion protection, and since the lubricant can compensate for the lack of friction, it is then The choice of friction characteristics, and finally consider the appearance."
6: Authentic "Investing in genuine products, otherwise it will cost a painful price"
Whether it's sports shoes or smart phones, cheap counterfeits are everywhere. Bolt products are no exception.
If you choose genuine, such as Nord-Lock lock washers, you get a long-term market test to ensure superior performance and quality.
You can identify authentic Nord-Lock products with laser tags . If you are not sure whether the purchased product is authentic, please contact your local registered sales office and our staff will help you with your inspection.
Frida Cullin, manager of Nord-Lock Technology Center, said: "As with many products, the bolting solution is also a penny. The price of genuine products is high, but because of the reliable performance of the product, it can reduce maintenance / maintenance costs. Long-term cost savings."
7: Quality "cooperating with companies with deep professional experience"
There are countless fastening solutions. Even if some solutions are widely used, it may not be possible to meet specific temperature or pressure ranges. Therefore, it is important to choose a partner to help you achieve high material stability and choose the ideal fastening solution.
Bolt Securing 's Peter Fjordman said: "Product recalls or brand image damage can have a major impact. For example, when I saw reports of accidents caused by leaks in the ventilation system, I would like to wonder if the company chose a fastening solution. improper."
Fjordman believes: "To achieve high quality standards, you need to work with companies with deep industry experience, and these companies pay more attention to quality than fast profit."
Nord-Lock is a trusted company in the industry with a number of quality certifications and high standards of application technology certification, such as marine, energy and transportation applications.
8: Corrosion "The corrosion factor should be considered in the initial stage of design bolt connection"
Some people say that there are only two things that can be determined in life, namely death and taxation. In fact, you can also add a third piece: corrosion. Metal products made of any steel material will eventually rust and decompose as long as they are exposed to oxygen and water. Dörken MKS-Systeme is committed to the development of micro-coating anti-corrosion systems. The company's Christian Rabe said: "In a certain period of time, corrosion is inevitable, but there are ways to delay the deterioration of corrosion."
One of the methods is cathodic protection, that is, sacrificial corrosion of the secondary metal such as sacrificial zinc, and non-cathode protection.
Rabe pointed out that there is no simple answer to resist corrosion. He joked: "The only way is to keep the equipment that is easily corroded in an unusually dry desert climate."
Nord-Lock offers a wide range of protective coatings and finishes, as well as multiple grades of stainless steel and nickel alloys.
9: Reuse "If you must reuse the bolts, be sure to use the lubricant"
Whether to reuse bolts is a common problem. It is especially convenient to reuse fasteners in the field when carrying spare parts of various sizes and grades. In addition, the cost of reuse is lower.
However, it is difficult to determine if the used fasteners are damaged and if they are damaged, it may cause problems. To determine if the bolt can be reused, depending on the situation, Nord-Lock application engineer Lena Kalmykova recommends a visual inspection: "If signs of corrosion are found, reuse should be avoided where possible. If thread damage is visible, It should also be avoided."
Kalmykova said: "But in some cases there may be no choice but to reuse the damaged bolts as a temporary solution. If it must be reused, be sure to use a lubricant. The lubricant can resist corrosion to a certain extent. If the thread is damaged The lubricant also helps to achieve the necessary pre-tensioning force before the opportunity to install new bolts."
10: Preload and tightening "Select the right tool and sequence of operations"
The preload level determines the bearing capacity of the bolted joint. Therefore, the preload force level that the bolt connection needs to reach should be judged, and then the preload force is achieved by an appropriate fastening method and tightening sequence.
The pre-tightening force must be at an appropriate level to avoid movement or separation of the clamping portion, but within the modulus limits of the material, avoiding the embedded butt surface and thread peeling.
According to Zouhair Chaib , senior technical expert at Nord-Lock France , it is also important to distinguish between the static and dynamic bearing capacity of the screw; the screw can withstand higher static loads but can withstand lower dynamic loads. Therefore, a high level of preload should be maintained to reduce the impact of dynamic loads on the joint.
Chaib said: "When tightening, you should choose the ideal tool and complete the tightening operation in a reasonable order to ensure that the pre-tightening force required by the design engineer is reached."
Nord-Lock engineers are industry experts who offer a comprehensive range of solutions for bolting, including design, product selection and on-site support.
Please note that this is a general recommendation and does not necessarily apply to all bolt applications.
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