Understanding washer dimensions

[delobe]

Hi, I am looking to replace some metal washers with silicone and Teflon washers. The metal ones were destroyed, so I only have their technical details. I am simply looking to get the right diameter silicone/teflon equivalents.

Here are the details of the metal washers:

1. KUPPER FLAT WASHER Ø 18X13.2X1MM (Teflon)
2. FLAT WASHER Ø 14/11/2x0/5 MM (Silicone)

and this one too:
3. PRECISION O-RING Ø 24.99X3.53 EPDM (so a 25mm diameter silicone washer would be the right size for this one?)

What would be the right size silicone/Teflon equivalents?
Thanks!

 

[Racers]

I might help if we knew what the washers where for.

Pete

 

[delobe]

Thanks. I have had help in understanding the dimensions. They are outer and inner dimensions of the washers. And the second one is apparently oval, hence the extra dimensions.

The washers are for an old cremina espresso machine. So, I am sorry if this is in the wrong place (woodworking forum, right?)

But at least some washer dimensions are cleared up.