Understanding Exact Dimensions vs. Nominal Dimensions

When purchasing materials from Fast Acrylic, it’s important to understand the difference between exact dimensions and nominal dimensions. This knowledge will help ensure that you select the right size for your projects and avoid any potential discrepancies.

What Are Nominal Dimensions?

Nominal dimensions are the approximate or rounded measurements used for labeling and describing materials. These dimensions are often simplified for convenience and ease of reference. For example, a sheet of acrylic labeled as "12 x 12 inches" might have actual measurements that are slightly less than the stated dimensions due to manufacturing processes.

What Are Exact Dimensions?

Exact dimensions are the precise measurements of a material, taken to a higher degree of accuracy. These dimensions reflect the true size of the material and are critical for applications requiring tight tolerances. For example, a sheet of acrylic with an exact dimension of "11.875 x 11.875 inches" is more precise than its nominal dimension counterpart.

Why Are Nominal Dimensions Used?

Nominal dimensions are commonly used because they:

• Simplify the labeling and categorization of materials.
• Make it easier for customers to quickly understand and compare sizes.
• Streamline manufacturing and inventory processes.

However, when precision is crucial for your project, it's essential to refer to the exact dimensions to ensure a proper fit and finish.

Important Note

Unless explicitly stated otherwise, all dimensions provided on our site are nominal. If you require exact dimensions for your project, please contact us directly to confirm the precise measurements.

Fractional Inches, Decimal Inches, and Millimeter Equivalents

Here’s a table that converts fractional inches, decimal inches, and millimeters:

This table helps you quickly convert between metric and imperial measurements to ensure accuracy in your projects.