BW: $25.79 at 8:50 AM 9/9/2010 

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Image of damaged threads High compressive loads during make-up of non-magnetic drill string components have a tendency to cause galling and scuffing on rotary shoulders and thread flanks. Upon breaking-out the connection, galled areas are forced to separate leading to severe damage of the thread flanks and/or rotary shoulders. Re-cutting is costly and can be limited especially with bottom-hole assemblies having stress relief grooves or due to logistics (copper plating of fresh threads at the remote drilling sites).