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The Collaborative International Dictionary of English v.0.48:

Coag \Coag\, n. See Coak, a kind of tenon. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Coak \Coak\, n. 1. (Carp.) A kind of tenon connecting the face of a scarfed timber with the face of another timber, or a dowel or pin of hard wood or iron uniting timbers. [Also spelt coag.] [1913 Webster] 2. A metallic bushing or strengthening piece in the center of a wooden block sheave. [1913 Webster]