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Gunmetal, also known as red brass is a type of bronze – an alloy of copper (88%), tin (10%), and zinc (2%). Originally used chiefly for making guns, gunmetal was eventually superseded by steel. Gunmetal casts and machines well and is resistant to corrosion from steam and salt water and is used to make steam and hydraulic castings, valves, and gears, and also statues and various small objects, e.g. buttons. It has a tensile strength of 221 to 310 MPa, a specific gravity of 8.7, a density 8,719 kg/m3, and a Brinell hardness of 65 to 74.

Gunmetal can also mean steel treated to simulate gunmetal bronze. Bushings made of this metal are used in machinery. Gunmetal gray refers to a dark grey color with a bluish and purplish tinge. It is sometimes described as having the appearance of “Black Chrome”.

A bushing, also known as a bush, is an independent plain bearing that is inserted into a housing to provide a bearing surface for rotary applications; this is the most common form of a plain bearing. Common designs include solid (sleeve and flanged), split, and clenched bushings. A sleeve, split, or clenched bushing is only a “sleeve” of material with an inner diameter (ID), outer diameter (OD), and length. The difference between the three types is that a solid sleeved bushing is solid all the way around, a split bushing has a cut along its length, and a clenched bearing is similar to a split bushing but with a clench across the cut. A flanged bushing is a sleeve bushing with a flange at one end exftending radially outward from the OD. The flange is used to positively locate the bushing when it is installed or to provide a thrust bearing surface.

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