Coil Spring

A home owner from New Jersey says:
I have this old coil sprint that labelled 5K. What does it mean? Does it mean 5kg = 11lb? Is that correct? Please see pictures.
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Tom from SWISCO responded:

Your old shoe looks like our 15-177 , which means the spring you want is our Series 152 . You can ignore the "K" in the stamp, it doesn't mean anything important. If yours is marked with 5 then that means each coil supports 5 pounds. You want the S152-5 .

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