Is there any copper tube grade having thickness greater than K?

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A. Levers

Yes, under ASTM B88, which is a standard for seamless Copper water tube. There may be other alternatives if you are able to use 70/30 or 90/10 Copper Nickle tube for your application. The following link may help

http://www.coleandswallow.com/drawn-copper-nickel-tube/

Mahesh K. Varpe

Vendors / supplier of copper products of industrial grade may be the right source. If possible visit their websites. if not available then ask them to provide as per your requirements.