Last updated on June 25th, 2024 at 08:35 am
At Approved Sheet Metal, we like to help our customers save time and money on custom metal fabrications whenever possible.
Today, we’ll detail some of the simplest actions you can take to optimize a piece of sheet metal and get the most bang for your buck.
Table of Contents
- 1 How to Get the Most Out of Sheet Metal Material
- 2 Recommended Default Sheet Metal Tolerances
- 3 Sheet Metal Material Optimization FAQ
- 3.0.1 How can I maximize the use of sheet metal material to save costs?
- 3.0.2 What's a smart strategy for optimizing sheet metal usage?
- 3.0.3 Can I request a custom sheet size if my part is smaller than standard dimensions?
- 3.0.4 How can I get the most out of same-day flat parts using sheet metal?
- 3.0.5 What should I consider when designing parts to fit on a single sheet?
How to Get the Most Out of Sheet Metal Material
1. Fit two parts on a sheet instead of one.
We find that when engineers are aware of the standard sheet sizes available, they can frequently adjust part drawings to fit more than one part on a single sheet. So without further ado, here are the standard sheet sizes you can expect from Approved Sheet Metal:
- 48” x 48”
- 36” x 96”
- 48” x 96”
- 36” x 120”
- 48” x 120”
For same-day flat parts, 48” x 48” is the standard size. It’s possible to source sheets up to 60” x 120”, but you’ll pay a premium and probably add a few days to your lead time.
To reliably fit two parts onto one sheet, we advise customers to design flat patterns that leave ¼” to ½” of allowance around each part and keep in mind most blanking machines have an unusable dead zone of 1” - 4” in the Y direction or smaller size of the sheet. In other words, if you want to fit two parts on a 36” x 96” sheet, plan for each part to measure no more than
- 31” = 36” - dead zone - 2 times the part spacing X for the width
- 47.25” = (96” - 3 spaces * part space (.5”))/ 2 parts
The example below with a part size of 31” x 47.25”
The example below with a part size of 15.5” x 23.25”
2. Pair a large part with a small part.
One of the best ways to optimize sheet metal material is to pair a large part with a small part when getting a quote for custom metal fabrications.
Once you know the standard sheet sizes available, you can determine how much material will be left over and get another part out of the remaining material that you’re already paying for.
3. Request a custom sheet in a smaller size.
Custom sizing is an option if your part is smaller than the standard sizes.
We recently sourced a 36” x 120” sheet for a customer who needed a 31.45” x 39.125 ” part. Had they gone with the standard 48” x 120” size, they would have wasted a substantial amount of material. Getting the smaller size ultimately ended up saving them money and reducing waste.
The right sheet metal shop will always go to bat for you to optimize your sheet metal material and find a sheet size that best fits your parts. But if you can make some of these changes or requests upfront, it expedites the whole process.
We’re happy to help customers find the right material for their part. Give us a shot on your next project and see for yourself how dedicated we are to saving you time and money.
Recommended Default Sheet Metal Tolerances
| DIM | Tolerance (MM) | Tolerance (Inches) | Description |
| A | ± 0.13 | ± 0.005 | Sheared Edge to Hole |
| B | ± 0.13 | ± 0.005 | 2 Holes on One Surface |
| C | ± 0.25 | ± 0.010 | Formed Edge to Hole |
| D* | ± 0.76 | ± 0.030 | Holes Across 2 Bends |
| E* | ± 0.76 | ± 0.030 | Holes Across 4 Bends |
| F | ± 0.25 | ± 0.010 | Sheared Edge to Bend |
| G | ± 0.38 | ± 0.015 | Across 2 Bends |
| H* | ± 0.76 | ± 0.030 | Formed Part |
Noted dimensions are to be taken while the part is in a restrained condition. Noted dimensions are for parts within a 12” envelope.
* Dimensions D, E and H are not recommended forms of dimensioning
These tolerances are recommended and best practices. We can obtain tighter tolerances (depending on part geometry/ construction), contact us for more information
Sheet Metal Material Optimization FAQ
To save costs, consider fitting two parts on a single sheet. Engineers can adjust part designs to fit standard sheet sizes such as 48” x 48”, 36” x 96”, and more. To achieve this, design flat patterns with ¼” to ½” allowance around each part, considering the dead zone of 1” - 4” in the Y direction. For instance, on a 36” x 96” sheet, aim for parts no larger than 31” x 47.25” to fit two pieces effectively.
Pair a large part with a small one when requesting a custom metal fabrication quote. Knowing standard sheet sizes allows you to utilize leftover material efficiently, getting an extra part without additional cost. By combining different sizes intelligently, you maximize the value of your sheet metal material.
Absolutely! If your part doesn't fit standard sheet sizes, you can request a custom sheet in a smaller size. For instance, a 36” x 120” sheet was sourced for a 31.45” x 39.125” part, saving material and costs compared to using a standard 48” x 120” sheet. A reputable sheet metal shop will work with you to find the optimal sheet size for your specific needs.
For same-day flat parts, the standard size is 48” x 48”. While sheets up to 60” x 120” are available, they may come at a premium cost and longer lead time. To optimize usage, consider fitting two parts on a sheet and designing flat patterns with appropriate allowances. Keeping within the usable area of the sheet ensures efficient material utilization.
When designing parts to fit on a single sheet, remember to leave ¼” to ½” of allowance around each part. Take into account the dead zone of 1” - 4” in the Y direction and the standard sheet sizes. For example, if you aim to fit two parts on a 36” x 96” sheet, each part's dimensions should not exceed 31” x 47.25”. This strategy optimizes material usage and helps save costs on custom metal fabrications.
