ᐅ Which screws are best suited for this purpose?

Hello everyone, I would like to start a well-informed discussion on the topic "Which screws are best suited?" Specifically, I am looking for precise recommendations for different applications. For example, I have projects involving wood, metal constructions, and outdoor use where long-lasting weather resistance is required. I am also interested in which types and materials of screws are advantageous in each case—such as stainless steel, galvanized, or possibly special coatings. Equally important to me are the types of screw heads, drive types (Torx, Phillips, etc.), and whether certain screws are better suited for repeated removal. I look forward to your insights and especially to detailed explanations that will help me make the right choice for each situation.

Hello Friedrichn, your topic is really extensive, you can see that right away. Basically, I would say that the best screw always depends on the application. For woodworking, chipboard screws or Forstner screws are very popular because they provide good hold and don’t loosen easily. For metal constructions, I would recommend machine screws with matching nuts and washers, as they are very stable and can withstand high loads.

Friedrichn schrieb:
for example, I have projects in woodworking, metal constructions, and also for outdoor applications...

Specifically for outdoor use, I advise using stainless steel or galvanized steel screws. Rust resistance is the key factor here; otherwise, screws quickly rust through and lose their function. Also, with screw heads, you can make installation much easier by using Torx drives, as Torx offers better grip than regular Phillips screws and reduces cam-out.

Friedrichn schrieb:
...whether some screws are better suited for repeated loosening.

Regarding that, I can say that machine screws combined with nuts are best suited for repeated tightening and loosening, while chipboard screws are more for one-time use. Overall, a lot depends on the material and purpose, but stainless steel Torx screws are usually a good compromise.

For clarification: Different types of screws have specific physical and chemical material requirements that should be considered when selecting them.

1. Wood screws typically have coarse threads to improve grip in wood. They usually feature a pointed tip to facilitate drilling. They are ideal for softwood, but hardwood should be pre-drilled to prevent splitting.

2. For metal, machine screws or sheet metal screws are used, which have finer threads. A precise drive type (e.g., hex socket or Torx) is important to transmit torque evenly.

3. For outdoor use, screws made of A2 (standard stainless steel) or A4 (acid-resistant stainless steel) are recommended. Zinc-plated screws are more cost-effective but offer less corrosion protection than stainless steel.

4. Regarding reusability: Machine screws with nuts are well suited because they do not grip directly into the material but clamp the components together. Wood screws, on the other hand, deform the material, making multiple insertions and removals more difficult.

In summary: screw type, material, and surface protection must be matched to the specific application. There is no single "best" screw—rather, the optimal combination is what matters.

I can easily understand that choosing the right screw can quickly become overwhelming, especially when considering different building materials and applications. I have often experienced working outdoors initially with cheaper galvanized screws, only to see them start to rust after a few years. That made me think, because such projects then unnecessarily cost extra materials and labor.

Ramon4 schrieb:
For outdoor use, I specifically recommend screws made of stainless steel or galvanized steel.

Stainless steel is more expensive, but in the long run, you often save yourself from having to replace them. Regarding screw heads: I prefer Torx for everyday use, because I have often encountered Phillips heads breaking or stripping easily.

For repeated removal, a machine screw with a nut works best, and I have gotten used to that by now. Sometimes I wish there were more practical tips on the right combinations available for DIY projects or repairs.

Thanks for the insights so far – I’m curious to see if more tips will follow :-)

I would like to add a brief overview to the discussion, which is often helpful especially for beginners:

1. Wood screws: best with coarse threads and a sharp, tapered tip. Screws with partial threading are ideal, as they make it easier to pull wooden parts together.

2. Sheet metal screws: designed for thin metal sheets, they are self-tapping, so pre-drilling is usually not necessary. For thicker sheets, pre-drilling is recommended.

3. Machine screws and nuts: used for heavily loaded connections and when repeated disassembly is required. The screw’s strength grade is important here (e.g., 8.8, 10.9).

4. Material:
- Galvanized screws: economical for indoor use, but not ideal for damp conditions.
- Stainless steel A2: corrosion-resistant, suitable for outdoor use and humid environments.
- Stainless steel A4: even more resistant, for example, in seawater settings.

5. Drive type:
- Phillips (PH) is standard but more prone to cam-out (slipping).
- Torx or hex socket provide better torque transmission, protect the screw head, and make assembly easier.

Common mistakes:
- Choosing screws that are too short (insufficient holding power).
- Using the wrong material and coating for the environment.

koduga schrieb:
I prefer Torx for everyday use because I have often experienced Phillips heads breaking or rounding out quickly.

Exactly, Torx really makes a difference.

Hope this overview is helpful!

For wood, I always use stainless steel Spax screws with Torx heads. For metal, I rely on machine screws with matching nuts, usually galvanized. For outdoor use: A2 stainless steel screws. The correct length and diameter are important; otherwise, nothing holds properly.