1. Outside Diameter (OD)

• Measure the outermost edge of the spring across its widest point.
• Ensure the caliper is perpendicular to the spring for an accurate measurement.

2. Inside Diameter (ID)

• Measure the innermost edge of the spring across its narrowest point.
• The ID is typically smaller than the OD by twice the material thickness.

3. Free Height (Hf)

• Measure the total height of the spring when not under load.
• Use a caliper or height gauge to check this dimension.

4. Number of Turns (Nt)

• Count the total number of full 360-degree waves in the spring.
• Some wave springs have partial turns at the ends, so note these as well.

5. Wire Thickness (T) and Width (W)

• Thickness (T): Measure the thickness of the flat wire using a micrometer.
• Width (W): Measure the width of the wire strip from edge to edge.

6. Working Load and Deflection

• To verify the load capacity, compress the spring under a known force and measure the resulting height reduction.

Tools Needed:

? Vernier caliper
? Micrometer
? Height gauge
? Load testing equipment (for dynamic measurement)