How to choose nylon screws
Screws made of nylon offer benefits that metal screws simply can not. But there are also some disadvantages to nylon screws that you need to be aware of. Our guide explains the upside and the downside to these components and the different types of nylon screws we offer to support your project/application. We’ll cover:
What are nylon screws and why are they used?
Nylon screws are just that: screws made of nylon. There are different types of nylon, but usually nylon screws are made of nylon 6/6 for its strength. They’re used as an alternative to conventional metal screws when the properties of nylon are more appropriate for the application.
For example, if weight is a concern, then nylon screws are often the preferred option. They’re an excellent all-around screw. Nylon is strong, especially for a plastic, with a tensile strength between 10,000 and 12,400 PSI. However, it’s not as strong as metal. You’ll need to look at the benefits and disadvantages of nylon screws to make your decision.
You can learn more about the differences between the two nylons in our guide, Nylon 6 vs. Nylon 6/6.
Key benefits of using nylon screws
What are nylon screws used for? They’re popular in industries that include electronics, automotive, medical devices, and consumer goods. The reasons vary:
- Electrical Insulation: Unlike metal screws, nylon screws are non-conductive. By providing electrical insulation, you can prevent short circuits.
- Corrosion Resistance: Nylon resists rust and corrosion, which prolongs the life of the screws and overall assembly.
- Lightweight: As already mentioned, nylon screws are lightweight, which is advantageous in industries such as automotive.
- Vibration Damping: Nylon absorbs vibrations, mitigating the risk of screws loosening due to persistent motion. This adaptability is especially invaluable where mechanical stability is critical.
- Thermal Insulation: Nylon is an asset when applications require minimal heat or cold transfer.
- Chemical Endurance: The resistance of nylon to a multitude of common chemicals makes nylon screws a good choice if your application will be exposed to chemicals or solvents.
Disadvantages of nylon screws
While nylon has many advantages, there aren’t a lot of drawbacks. However, they are critical factors to take into consideration. Keep in mind that all plastics, including nylon, can be formulated to give you the characteristics you want. For example, nylon can not stand up to UV rays but with stabilizers, it can.
- Lower Strength: Nylon screws generally have lower load-bearing capacity and torque resistance compared to metal screws, which limits their use in heavy-duty applications.
- Temperature Limitations: Nylon's properties can degrade at very high temperatures, making it unsuitable for applications with extreme heat.
- Hygroscopic: Nylon absorbs moisture and water, which alters its properties and causes it to swell. Depending on the application, this isn’t always a disadvantage. The ability to absorb a small amount of moisture can help ensure a snug fit and prevent loosening over time. To minimize water absorption, you can add the plastic acetal to its formula.
Different types of nylon screws available
Our range of nylon machine screws come in different head types and drive configurations. Machine screws are almost – and we stress the word ‘almost’ – always flat tipped. They’re also typically fully threaded and intended for pre-drilled holes.
To learn more about machine screws, see our Guide to Machine Screws.
Nylon machine screws
The larger surface area of the pan head distributes the load more evenly when the screw is tightened. Ideal for electrical and electronic applications, such as circuit boards, control panels and enclosures. Available with slotted or Phillips drive.
Flat top with cylindrical, slightly tapered sides provides a wide-bearing surface for distributing load and preventing over-tightening. Typically used where a low-profile appearance is needed, such as in electronics assemblies and consumer appliances. Available with slot drive.
Nylon thumb screws are types of machine screws. The knurled flange is easily gripped, enabling manual tightening and loosening. Nylon thumb screws are commonly used in applications where frequent adjustments or quick assembly and disassembly are required, such as securing panels, covers, or components in electronic equipment, machinery, and enclosures.
Ideal for use in applications where higher torque fastening is required. The design reduces risk of slippage during tightening or loosening. These nylon machine screws are often used in electronics and consumer appliances. Available with slotted drive.
Reduced snagging & risk of injury from sharp edges. Ideal for electronic enclosures and housings when you need secure fastening without the risk of electrical conductivity. Easy to clean & decorative appearance.
Nylon grub screws
Also known as nylon grub screws, these are a type of blind screw, designed to hold collars, pulleys, or gears on shafts. They exert compressional force through their tip. This is what stops the relative movement between the two components being fastened, so that they can operate as designed. Slot drive.
You can learn more about nylon grub screws in our guide, What is a Set Screw?
You can also view our full range of nylon screws. Free CADs are available for most solutions, which you can download. You can also request free samples to make sure you’ve chosen the right product for what you need. If you’re not quite sure which nylon screw will work best for your application, our experts are always happy to advise you.
Key factors to consider when choosing nylon screws
Not all nylon screws are right for every application, of course. You should also look at these factors to help you make your choice:
- Type of Nylon: Different types or grades of nylon possess distinct properties such as strength, temperature resistance, and chemical compatibility. Select a nylon that aligns with the application's load-bearing demands and environmental conditions. As we’ve already noted, nylon screws are almost always nylon 6/6.
- Thread Specifications: The thread size and type should be compatible with the threaded holes or nuts in use to guarantee proper fastening and avoid potential damage.
- Head Design: Choose the suitable head type based on aesthetics, load distribution, and flush requirements.
- Drive Type: Select the appropriate drive configuration, such as slotted or Phillips, for efficient torque transfer during tightening. You can learn more about thread, head and drive types in What are screws heads,drives and threads?
- Load Capacity: Nylon screws generally have lower load capacities than metal screws, so ensure that the chosen screws can handle anticipated mechanical stresses without failing.
- Environmental Factors: Account for exposure to elements like moisture, chemicals, temperature changes, and UV radiation. Remember, if using outdoors, the nylon should be specially formulated for those conditions.
- Assembly Process: Consider the ease of assembly, as nylon screws might require different torque values than screws made of other materials. You should always adhere to the screw’s recommended tightening torque to avoid material damage due to excessive force.
- Long-Term Performance: Account for nylon's behavior over time, including any hygroscopic effects or changes in dimensions, as well as prolonged exposure to environmental elements.
- Cost Analysis: Nylon screws can be cost-effective compared to certain metals and even other plastics. Evaluate the cost in relation to the expected performance and benefits.
If you’re still not sure of anything, our experts are always happy to help you determine the right screws for your application.
How to use nylon screws
Using nylon screws is similar to using metal screws, but there are some considerations specific to nylon's properties.
You will have already chosen the appropriate type of nylon screw based on your application's requirements, load-bearing needs, and aesthetic preferences. Now that you know the type, you need the correct size, including thread diameter and length.
If you’re unsure of the size you need, check out our guide, What are Screw Thread Sizes?
Once you have the right size, it’s time to get down to business installing it:
1. Prepare the Materials: Make sure the materials you're fastening are clean and free from debris, dust, or residues.
2. Pre-Drill Holes (if needed): If you're fastening into hard materials, such as wood or metal, it's good practice to pre-drill pilot holes to prevent the material from splitting or cracking.
3. Thread the Screw: Begin threading the nylon screw into the pre-drilled hole or threaded nut by hand. Make sure it engages the threads smoothly.
4. Hand Tighten: Gently tighten the screw by hand until it's snug against the material. Avoid over-tightening, which can strip the threads or damage the material.
Use a Tool (if necessary): If the screw is difficult to turn by hand, you can use a compatible screwdriver. Nylon screws usually require less torque compared to metal screws, so be careful not to overtighten.
5. Stop at the Right Torque: Nylon screws have a lower torque tolerance than metal screws. Stop tightening when you feel resistance or when the screw is secure.
Note: Nylon screws can strip more easily than metal screws, so be cautious not to over-tighten, which can lead to thread damage.
Disassembly: Nylon screws are typically not as durable as metal screws and can wear down with repeated assembly and disassembly. If you need to frequently take apart and reassemble the components, nylon might not be the best choice.
Download free CADs and try before you buy
Free CADs are available for most solutions, which you can download. You can also request free samples to make sure you’ve chosen the right product for what you need.
If you’re not quite sure which solution will work best for your application, our experts are always happy to advise you.
Whatever your requirements, you can depend on fast dispatch. Request your free samples or download free CADs now.
Questions?
Email us at sales@essentracomponents.com or speak to one of our experts for further information on the ideal solution for your application 800-847-0486.