Last updated on May 2nd, 2024 at 11:59 am
Engineers commonly default to using steel hardware for their custom sheet metal parts—and it’s easy to understand why. Steel hardware is the cheapest and most ubiquitous option. If you have a steel part or a part that will be powder coated or zinc plated, steel hardware is a viable solution that will definitely save you some money.
But when you’re dealing with certain materials or processes, standard steel hardware can actually be detrimental to your parts.
Table of Contents
- 1 The Challenge with Steel Hardware
- 2 When Stainless Steel Hardware Is a Better Choice
- 3 Sheet Metal Hardware Hole Sizes Chart
- 4 Sheet Metal Material and Hardware FAQ
- 4.0.1 When should I use steel hardware for my custom sheet metal parts?
- 4.0.2 Why should I avoid using steel hardware with aluminum or stainless steel parts?
- 4.0.3 When is stainless steel hardware a better choice than steel hardware?
- 4.0.4 Can stainless steel hardware be anodized like steel hardware?
- 4.0.5 How can I determine the appropriate hardware to use with different sheet metal materials?
The Challenge with Steel Hardware 
If you’re using aluminum or stainless steel for your custom metal fabrication, you generally want to avoid steel hardware. Here’s why:
- Steel doesn’t stand up to plating. Aluminum parts are often plated after fabrication, but steel hardware won’t hold up during the plating process. If you’re planning to plate your aluminum parts, steel hardware will have to be inserted afterward, creating an additional step before getting your parts out the door.
- Steel is softer than stainless steel. When the hardware is softer than the material it’s fastening, the knurls won’t grip the material properly. There’s a good chance that the hardware will fall out instantly, or later when placed under pressure.
When Stainless Steel Hardware Is a Better Choice
In many applications, stainless steel hardware is a preferable alternative to steel. Here’s when stainless steel is the best choice:
- Stainless steel parts. Stainless steel hardware is hard and strong enough to grip stainless steel parts so they don’t succumb to pressure.
- Chromated aluminum parts. When steel is submerged in a chromate tank, the chemical reaction corrodes the steel almost immediately. Stainless steel, on the other hand, can withstand the chemicals in the tank. Although it’s possible to pair aluminum hardware with aluminum parts, we try to avoid it when we can. Aluminum hardware is significantly softer than stainless steel and doesn’t hold up as well.
What about anodizing? Like steel, stainless steel can’t be anodized. Depending on your part material, you have a couple of options. If you have a steel or stainless steel part, we recommend anodizing the part first and adding stainless steel hardware afterward. But if your part is made of aluminum, you could choose aluminum hardware and get the whole assembly anodized.
Here’s a chart to help you make sense of mixing and matching hardware with sheet metal materials:
If you want to feel confident in your material and hardware combo, request a quote from Approved Sheet Metal today!
Sheet Metal Hardware Hole Sizes Chart
CHART DOWNLOAD
Hardware hole sizes are the number one thing sheet metal fabricators have to fix before sending a part to the floor. So we have created a referenceable chart for product developers that are designing sheet metal parts. Use this chart to find the correct hole size for the hardware you select.
Sheet Metal Material and Hardware FAQ
Steel hardware is a cost-effective choice for custom sheet metal parts, especially when the parts are made of steel themselves or will undergo processes like powder coating or zinc plating. It saves money and is widely available for such applications.
Steel hardware is not suitable for use with aluminum or stainless steel parts due to specific challenges. Firstly, steel hardware won't withstand the plating process on aluminum parts, requiring an extra step. Secondly, steel hardware is softer than stainless steel, leading to poor grip and potential hardware failure under pressure.
Stainless steel hardware is a superior option in certain situations. It is ideal for securing stainless steel parts effectively and is resistant to chemical corrosion when used with chromated aluminum parts. Its durability and strength make it a preferred choice in these scenarios.
No, stainless steel, like regular steel, cannot be anodized. However, the approach to anodizing depends on your part material. For steel or stainless steel parts, it's recommended to anodize the part first and then add stainless steel hardware. If your part is aluminum, you can opt for aluminum hardware and have the entire assembly anodized.
Approved Sheet Metal provides a hardware chart for mixing and matching hardware with various sheet metal materials. Additionally, their experts can assist in selecting the right hardware for your custom metal fabrications, ensuring you get the highest quality parts tailored to your specific needs.
