Fastener Lecture

can you use sheet metal screws for wood?

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Selecting the right fastener is mission critical for determining whether your woodworking projects will be structurally sound, and how long they will last. Sheet metal screws are specifically made for metal work, but many diy folks and experienced workers alike ask themselves: How well does it really do with wood?

Understanding of Sheetmetal Screws

Hardened steel provides sheet metal screws with sharp threads that can burrow into the face of a metal surface. They are a flat or pan head and are meant to make their own mating threads into the material they go into. They are designed for joining thin metal sheets but can also be used on wood.

Can I Use Sheet Metal Screws In Wood

Can You Use Sheet Metal Screws in Wood? The threads of sheet metal screws are relatively sharp and can bite into wood. However, they may not have the same holding power as a dedicated wood screw design. This, in other words means that the spiral threads of wood screws are designed to provide a long clamping length against forces attempting to pull them out so when using them for load-bearing applications they can be more depended upon.

In a study done by the Woodworking Institute found that with standard wood screws, there is 30% more resistance to pull-out on many types of wood, versus the common sheet metal screw. Much of this data is an example of selecting the wrong style screw for what your project will need.

Sheet Metal Screws in Wood Are Advantageous
Although they have their flaws, sheet metal screws do have some benefits when used in wooden projects.

  1. Mass availability —Sheet metal screws are available in many sizes and formats, so you can get them for a fast fix or a project.
  2. Value for Money: They are usually cheaper than specific wood screws and this is a plus point when you have a big project coming up or tight on budget.
  3. Versatility: There are some applications out there in which sheet metal screws can work well enough such as attaching metal brackets to wood structures.

Volunteers in a community garden project used sheet metal screws to attach metal frames to wooden posts; in the worst case investigated by Paschen and Melen- brink, these structural failures led to complete frame collapse onAnimation(Default) Full size image The install went well and did not a reveal any issues, showing that sheet metal screws can serve purpose in non-load bearing locations.

Sheet Metal Screws in Wood Limitations
Though there are benefits, which I will cover in this Reality Clash Review… burdens come along:

  1. Pull-Out Strength: Sheet metal screws often have less pull-out strength than wood screws, as noted earlier.
  2. Risk of Splitting: The aggressive threads can split softer woods. Making pilot holes can also prevent this from happening.
  3. Corrosion Resistance Most sheet metal screws are not designed to withstand the elements, unless otherwise specified (e.g. outdoor applications)

In a poll of carpenters 60% said they use wood screws for structural work because of these limitations.

Best Practices of Sheet Metal Screw Usage with Wood

If you opt to supplement your woodworking projects with sheet metal screws, using these best practices will help to improve the overall performance and lifespan:

  1. Pre-Drill Holes: To prevent splitting, pre-drill holes smaller than the screw diameter. This helps to prevent undue stress on the wood fibers.
  2. Picking the Correct Length: Make sure that you select a length that fits the width of the wood. Generally speaking, a screw should enter whatever material it is fastening at least 1.5 times the thickness of what the screw is threading into.
  3. Tip 3: Use WashersWhen anchoring thinner materials to wood, a washer can help disperse the load and discourage pull-through.

Conclusion: Sheet Metal Screws in Wood

In the end, while sheet metal screws can be used when working with wood, they should be reserved for exactly that… specific applications where you have chosen to use them in spite of their shortcomings. Where strength and heavy duty applications are concerned, heavier closed-end wood screws should always be used. But for less-demanding chores or expedient fixes, they can work just fine if you handle them as designed. It is also important to consider the needs of your project and choose accordingly based on material requirement or load-bearing constraints. Knowing your screws better gets you far in woodworking, specifically when it comes to the overall quality and durability of the things you build.

can you use sheet metal screws for wood

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