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C-channels are specified by their dimensions (depth, width, and thickness), material properties, and standards. Below are common specifications:

Dimensions: C-channels are typically designated by their depth (height of the channel) and weight per unit length. For example, a C8 x 18 would mean the channel is 8 inches deep and weighs 18 pounds per foot.

Web Thickness: The thickness of the vertical web of the channel.

Flange Width: The width of the horizontal flanges on top and bottom.

Material: C-channels are usually made of steel (like ASTM A36, A992, etc.), but can also be made from other materials like aluminum or stainless steel.

Length: C-channels can be fabricated to various lengths based on the requirements of a project.

.Common Standards for C-Channels

ASTM A36/A36M: Standard specification for carbon structural steel shapes, plates, and bars of structural quality.

ASTM A572: Standard specification for high-strength low-alloy columbium-vanadium structural steel.

ASTM A992: Standard specification for structural steel shapes for use in building framing.