Top M4 Nylon Hex Bolts for Lightweight Projects
The uxcell M4 Nylon Hex Bolts are the best overall pick for most users, offering a robust blend of strength, corrosion resistance, and affordability. These bolts are ideal for electronics enclosures, 3D printer builds, and other lightweight applications where metal fasteners are overkill and could cause short circuits. Their main limitation is that they are not suitable for high-torque or load-bearing structural applications, as nylon will strip under excessive force.
M4 nylon hex bolts are a staple in the toolkit of any electronics hobbyist, 3D printing enthusiast, or DIY builder. They offer the convenience of standard hex bolts but with the benefits of electrical insulation, corrosion resistance, and light weight. Whether you are assembling a drone, securing a PCB, or building a custom frame, these fasteners prevent short circuits and are gentle on threaded holes.
Our selection includes options that vary in length, pack size, and price, ensuring you can find the right set for your specific project. We have analyzed specifications, user reviews, and material properties to bring you a list of the most reliable and practical M4 nylon hex bolts available on Amazon today.
Our top picks
uxcell M4 Nylon Hex Bolts, 20mm Length, 20 Pack
These uxcell M4 nylon hex bolts are a top seller on Amazon, known for their consistent quality and precise threading. Made from food-grade nylon, they are non-conductive and resistant to corrosion, making them perfect for electrical projects. Users report they fit standard M4 nuts and washers without issues, and the 20mm length is versatile for many applications.
Pros
- Excellent electrical insulation
- Precise threads, minimal burrs
- Good value for a 20-pack
Cons
- Not for high-strength applications
- Nylon can deform under high heat
Nylon Fasteners M4 x 10mm Hex Bolts (50 Pack)
This bulk pack from Nylon Fasteners is specifically designed for electronics work. The 10mm length is ideal for mounting PCBs and components with minimal clearance. Made from natural nylon, these bolts are non-magnetic and electrically insulating. Many reviewers use them for 3D printer builds and RC projects, praising their clean finish and consistent dimensions.
Pros
- Large 50-pack for bulk projects
- Short length perfect for PCB standoffs
- Non-magnetic and insulating
Cons
- Short length limits general use
- May need to buy nuts separately
Hirosarts M4 Nylon Hex Bolts, 16mm Length (30 Pack)
Hirosarts offers a well-rounded 16mm bolt that is a favorite among 3D printer enthusiasts. The length works well for attaching parts with spacers or standoffs. The nylon is slightly more flexible than metal, which helps reduce vibration and allows for a snug fit without over-tightening. Customers note that the hex heads are sharp and clean, allowing for easy wrench grip.
Pros
- Ideal length for many 3D printer applications
- Slight flexibility reduces vibration
- Good thread quality
Cons
- May strip if over-tightened
- No variety in pack sizes
Bolts Depot M4 x 25mm Nylon Hex Bolts (10 Pack)
When you need extra length for thick materials or standoffs, the Bolts Depot M4 x 25mm nylon bolts are a solid choice. These are made from UV-stabilized nylon, making them suitable for outdoor use where sunlight might degrade other plastics. The 10-pack is smaller, but each bolt is individually inspected for quality. Users appreciate the durability and the ability to cut them down if needed.
Pros
- UV resistant for outdoor projects
- Longer length offers more versatility
- High-quality nylon resists cracking
Cons
- Only 10 pieces per pack
- May be too long for tight spaces
Ziyun M4 Nylon Hex Bolts with Nuts, 12mm Length (40 Sets)
Ziyun provides a convenient kit that includes matching nylon nuts, which is perfect for those who need a complete fastening solution. The 12mm bolts are a common size for various DIY tasks. The set comes in a reusable storage box, keeping components organized. Customers like the fact that they do not have to source nuts separately, and the nylon material is consistent throughout.
Pros
- Includes matching nuts
- Convenient storage box
- Good for small projects
Cons
- Not the cheapest per piece
- Length may not suit all needs
Nylon Screws M4 x 6mm Hex Bolts (100 Pack)
For projects that require a large number of small screws, this 100-pack of 6mm length bolts is an economical choice. These are often used for securing small components, such as Raspberry Pi cases or Arduino shields. The short length is not for structural use but is ideal for low-profile fastening. Reviewers note that the threads are clean and the nylon is slightly translucent, which is normal.
Pros
- Huge quantity at low cost
- Perfect for small electronics
- Lightweight and non-conductive
Cons
- Very short, limited use
- No nut included
Aibote M4 Nylon Hex Bolts, 20mm Length (50 Pack)
Aibote offers a 50-pack of M4 nylon hex bolts that are marketed for professional and industrial use. They are manufactured to tighter tolerances and have a higher density, which provides better thread holding. The 20mm length is a common size for machinery guards and panels. While they are slightly more expensive, the consistent quality is appreciated by those who need reliable fasteners for production runs.
Pros
- Higher strength due to glass fill
- Consistent dimensions
- Good for repeated assembly
Cons
- More expensive per piece
- Glass fill may be abrasive to tools
Compared at a glance
| # | Model | Thread Size | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | uxcell M4 Nylon Hex Bolts, 20mm Length, 20 Pack | M4 x 0.7 | All-around use and value | 9.4 | Check price |
| 2 | Nylon Fasteners M4 x 10mm Hex Bolts (50 Pack) | M4 x 0.7 | Electronics and PCB mounting | 9.2 | Check price |
| 3 | Hirosarts M4 Nylon Hex Bolts, 16mm Length (30 Pack) | M4 x 0.7 | 3D printer builds | 9.0 | Check price |
| 4 | Bolts Depot M4 x 25mm Nylon Hex Bolts (10 Pack) | M4 x 0.7 | Longer reach applications | 8.8 | Check price |
| 5 | Ziyun M4 Nylon Hex Bolts with Nuts, 12mm Length (40 Sets) | M4 x 0.7 | Complete fastener sets | 8.7 | Check price |
| 6 | Nylon Screws M4 x 6mm Hex Bolts (100 Pack) | M4 x 0.7 | Bulk and small fasteners | 8.5 | Check price |
| 7 | Aibote M4 Nylon Hex Bolts, 20mm Length (50 Pack) | M4 x 0.7 | High-volume professional use | 8.3 | Check price |
How to choose
Understanding M4 Nylon Hex Bolts M4 refers to the metric thread diameter of 4 millimeters, with a standard pitch of 0.7 millimeters. Nylon hex bolts are made from polyamide, typically nylon 6/6, offering a blend of strength and flexibility. They are non-magnetic, non-conductive, and resistant to many chemicals and corrosion. These properties make them ideal for electronics, where metal fasteners could cause short circuits, and for outdoor applications where rust is a concern.
Choosing the Right Length The length of the bolt is measured from under the head to the end. For PCB mounting, you often need lengths from 6mm to 12mm, depending on the standoff height. For general assembly, 16mm to 25mm are common. Always consider the thickness of the materials you are joining and any spacers or washers. It is better to have a slightly longer bolt and use a nut or spacer than to have one that is too short.
Installation Tips Nylon bolts are softer than metal, so they can strip easily if over-tightened. Use a hand screwdriver or a wrench with a light touch. Avoid using power tools at high torque. If you need a stronger hold, consider using a nylon insert lock nut. Also, be aware that nylon expands and contracts with temperature changes, so periodic re-tightening may be necessary in environments with significant temperature swings.
When Not to Use Nylon Bolts Nylon hex bolts are not suitable for high-strength structural applications. They have a lower tensile strength compared to metal and can deform under heavy loads. They also have a maximum continuous operating temperature of about 90 to 120 degrees Celsius, depending on the nylon type. In high-heat environments, they may soften or melt. For load-bearing or high-temperature applications, consider metal bolts instead.
Good to know
Are M4 nylon hex bolts electrically insulating?
Yes, nylon is an excellent electrical insulator. M4 nylon hex bolts are commonly used in electronics to prevent short circuits and to isolate components from conductive surfaces.
Can I use M4 nylon hex bolts outdoors?
Yes, but you should choose a UV-stabilized nylon if the bolts will be exposed to direct sunlight for extended periods. Standard nylon can become brittle over time due to UV degradation.
What is the tensile strength of M4 nylon hex bolts?
Nylon 6/6 bolts typically have a tensile strength of about 10,000 to 12,000 psi, which is significantly lower than steel. They are suitable for light to moderate loads, not for structural support.
How do I cut a nylon bolt to a shorter length?
You can cut nylon bolts with a fine-toothed saw or a sharp utility knife. After cutting, use a file to clean up the threads and remove any burrs so they will fit into a nut.
Will nylon hex bolts react with chemicals like gasoline or solvents?
Nylon has good resistance to many chemicals, but it can be affected by strong acids, bases, and some solvents. For chemical resistance, check the compatibility with the specific substance you are using.
Can I reuse nylon hex bolts?
Yes, nylon bolts can be reused, but the threads may wear over time, especially if they are frequently removed and installed. Inspect them for cracks or deformation before reuse.
Do I need to use a lubricant when installing nylon bolts?
It is not necessary, but a small amount of silicone-based lubricant can make installation easier and reduce friction, preventing the nylon from heating up and deforming.
What is the difference between nylon 6 and nylon 6/6?
Nylon 6/6 has a slightly higher melting point and better mechanical strength compared to nylon 6. Both are used for fasteners, but nylon 6/6 is often preferred for higher performance applications.
Our take
For most hobbyists and DIYers, the uxcell M4 Nylon Hex Bolts in 20mm length are the best choice because they combine quality, versatility, and value. If your work is exclusively in electronics with confined spaces, the Nylon Fasteners 10mm pack is a more specialized option. For those needing a complete set with nuts, the Ziyun kit is convenient. Whatever you choose, ensure the length matches your project requirements and avoid over-tightening to get the most out of these plastic fasteners.
