Crush washers, like most washers, are typically measured by three key dimensions: their inside diameter (ID), outside diameter (OD), and thickness.
Understanding Washer Measurements
The video reference highlights the standard ways to measure a round washer, which directly apply to crush washers. These measurements are crucial for ensuring the correct fit and function of the washer in an assembly.
Here are the primary measurements:
- Inside Diameter (ID): This is the size of the center hole. The ID is usually the most important measurement, as it determines what size bolt or screw the washer will fit onto.
- Outside Diameter (OD): This refers to the size of the entire ring from edge to edge. The OD dictates the bearing surface area of the washer.
- Thickness: This is simply the dimension from one flat side of the washer to the other. Thickness affects the overall stack height of the assembly and can play a role in the washer's ability to "crush" or deform under load.
Measurement Breakdown
To make this clear, here is a table summarizing the measurements:
| Measurement | Description | What it determines |
|---|---|---|
| Inside Diameter (ID) | The size of the center hole. | What size bolt or screw it fits. |
| Outside Diameter (OD) | The size across the entire washer. | The surface area that contacts the mating parts. |
| Thickness | The height of the washer. | Overall stack height; affects deformation properties. |
Why These Measurements Matter for Crush Washers
While the basic measurements are the same as other washers, they are particularly important for crush washers because their function relies on controlled deformation. The ID must match the bolt/pipe size, the OD affects how much sealing surface is available, and the specific thickness and material determine how much the washer will "crush" to create a tight seal when compressed.
Choosing the correct size ensures the crush washer seals effectively without being too large (interfering with other components) or too small (failing to seal or fit the bolt).
