Library › Hardware › S shapes (AISC American Standard beams): S6x12.5, S12x31.8…

S18 x 54.7 S shape

S18 x 54.7 S shape: depth 18.0 in (457.2 mm), flange 6.0 in (152.4 mm), web 0.461 in, mean flange 0.691 in, flanges sloped 2 in 12 in inside, 4 in long

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

shapeS18x54.7
lb/ft54.7
d (in)18.0
bf (in)6.0
tw (in)0.461
tf mean (in)0.691
k (in)1.5
d (mm)457.2
bf (mm)152.4
tw (mm)11.71
tf (mm)17.55
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

From the full sheet

S shapes (AISC American Standard beams): S6x12.5, S12x31.8 dimensions + STEP/STL: every size, notes, mating features and sources. What are the dimensions of an S6x12.5 beam?

Other sizes