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You are here: Home > What Welding Fitting do I have? A, B or C size?
CGA Brass Welding Fittings A,B, and C size Fittings.
Which size do I need?
Every industry has certain jargon. In the welding industry, brass gas fittings are categorized into different sizes. The A-size fittings are the smallest, B-size is the most common, and C-size is the largest.

Do you have a piece of equipment and donít know what size you need? Just follow these quick guidelines shown in photo 1.

Many smaller oxy-fuel brazing torches and some TIG welding torches use A-size fittings. Most standard size oxy-fuel brazing and cutting torches use B-size fittings. Most inert gas-hose fittings (argon, helium, nitrogen, etc) are also B-size fittings. The larger C-size fittings are used mainly on the power cables on TIG water cooled welding torches, but may also be found on very large oxy-fuel cutting torches.

Type A-size fittings use a 7/16 inch wrench as shown in photo 1. B-size fittings are used typically for standard connections for both inert gases and oxygen and acetylene. These fittings use an 11/16 inch wrench. See photo 1.

C-size fittings are more typically used for power cable fittings for TIG torches.

As always, welding safety is very important.
We have included some links that provide some good welding safety information.

National Fire Protection Association

Compressed Gas Association

American Welding Society

James F. Lincoln Arc Welding Foundation