Bronze Tube Tolerances

Continuous cast bronze tube is cast or manufactured with additional stock on both the ID (inner diameter) and OD (outer diameter) in order to finish to the stated nominal size.  The nominal size is the listed ID & OD size.  For example if you were to order a piece of bronze tube stock with a nominal size of 1 x 2, this means that the ID will finish to 1” and the OD will finish to 2”.  In order to accomplish this the bronze tube is cast with a pre-determined additional amount of stock on both the ID and OD.  So in reality the ID of the 1 x 2 sizes is actually slightly smaller than 1” and the OD is slightly larger than 2”.

When we speak of bronze tube tolerances we are talking about exactly how much extra stock is on either the ID and/or OD of the material.  The amount of additional stock varies by both alloy type and outer diameter size of the tube.  The below chart will help you understand the actual cast size of the most common continuous cast bronze alloys.