API sucker rod couplings with big chamfer
 

Except other advantage, API sucker rod couplings with big chamfer. The cylindricak surface and end face of sucker rod couplings connection is a 45 chamfering slant. The junction of cylindrial surface and chamfered slant is a arc chamfer less than 1.67mm.  The chamfer can can greatly avoid he acratches damage effects on the pipiline wall during the touch with couplings cyclindrial. So that the life of the couplings and pipeline are signficantly prolonged.And the operating costs of oil production reduced.

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