Hydraulic Cylinder Deep Hole Drilling: Honing Stock, Bore Finish, and What I Leave for the Hone

I have drilled thousands of hydraulic cylinder barrels at this point, and if there is one question that comes up every time I walk into a new shop it is this: how much do I leave for the hone? The answer is never the same number twice. It depends on bore diameter, length, material, drilling method, and how straight the bore comes out of the machine. This article is the guide I wish I had when I started — what I leave for the hone, how I decide, and what tells me I have got it wrong. ...

June 16, 2026 · Engineer at the Deep Hole