Which part is the challenge coin thickness?

The thickness of a challenge coin typically ranges between 3 mm (0.12 inches) to 4 mm (0.16 inches), depending on the design, material, and manufacturer. That is why different manufacture quote different prices, because different details occur different cost.
Some custom coins can be thicker or thinner based on specific requirements. Thicker coins may be used for more intricate designs or to convey a sense of higher value and durability.

During our business discussing with hundreds of customers, we find that many new customers are confused on the challenge coins thickness, when you want to produce a challenge coin, firstly you need confirm the custom challenge coin size, usually challenge coin can be 1.5inch, 2inch, 2.25inch, 2.5inch and so on. But max. Is 5inch at present.
Next step we need to know how thick of the custom coins you want to make, for many military coins, the max, we have done is 15mm, but usually police challenge coins are 4-5mm. Please remember the thicker the more material needs, then means more cost for you.
But on the personalized coin, do you know there is two different thicknesses on challenge coin design.
One is the customized challenge coin edges thickness, please see below:

Usually this part is the police challenge coins or military challenge coins edge, so we call it challenge coin edge thickness, this is usually confused by customer, many customer tell us this thickness, then they think this is the coin thickness.
But when you design your own challenge coin, please remember, challenge coin manufacturers calculate the custom challenge coins cost and thickness based on the custom coins max.highest part thickness.
Of course for 2D challenge coin like firefighter challenge coins, custom commemorative coins,law enforcement challenge coins and police challenge coins, there is no difference on these two thickness. Please check below 2D challenge coin thickness, the middle parts are the same with the edges parts.

This is especially important when you want to produce 3D challenge coins, usually used for army challenge coins, military challenge coins and navy challenge coins, some customer only tell us the custom coin edge thickness, but in challenge coin manufacturing, we calculate thickness based on the max thickness,
Please check below, this time, you see the thickness is different.

Challenge coin edge is only 4mm, but middle 3D part thickness is 7.5mm, so if you only tell us 4mm, we will calculate based on the 3D part is 4mm, then the challenge coin will be made wrong thickness.
So when you want to design your own challenge coin, please pay attention on the thickness to tell the challenge coin makers your max. Thickness. That will be avoid many problems when coins producing.