Always refer to the latest AISC Steel Construction Manual for design codes, and when in doubt, hire a licensed professional engineer.
A: AISC allows a tolerance of +1/8" on depth and +1/4" on flange width. Your actual C8x13.75 could be 8.06" deep. Always measure the specific lot if nesting into an existing assembly. c8x13.75 channel dimensions
The standard C8 series includes lighter options (C8x11.5) and heavier options (C8x18.75). The 13.75 variant offers a balance of strength and weight, making it ideal for spans where a C8x11.5 is too weak, but a C8x18.75 is overkill and too expensive. Always refer to the latest AISC Steel Construction