Round HSS tube (AISC): HSS 4.500x0.237, HSS 6.625x0.280, HSS 10.000x0.375 dimensions + STEP/STL — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/aisc-hss-round/ (sheet CC BY 4.0) Basis: AISC Shapes Database (v15.0 values): OD, tnom, tdes for every round HSS Catalog version: 2026-10-20 Overall (mm): length 101.6 - Round HSS is cold-formed round tube with an outside diameter in inches (HSS6.625x0.280 is 6.625 in OD, the same OD as NPS 6 pipe). It is sold to ASTM A500 with the nominal wall tnom; AISC uses the design wall tdes = 0.93 x tnom in strength calculations. - Files draw the OD and the nominal wall (inside diameter = OD - 2 tnom). The printed area uses the design wall, so the drawn area is about 7 % higher; the design-wall version of the same section matches the printed area within 2 %. - AISC pipe sizes (STD, XS, XXS) share the pipe OD; use schedule-40-pipe for NPS pipe. This page lists the HSS round sizes only. - Files are 4 in (101.6 mm) long extrusions along X; the section is in the YZ plane, axis at y = 0, z = OD/2. - 13 of the 128 sizes have files. shape lb/ft OD (in) tnom (in) tdes (in) OD (mm) tnom (mm) tdes (mm) ID (mm) HSS20.000x0.500 104.0 20.0 0.5 0.465 508.0 12.7 11.81 482.6 HSS20.000x0.375 78.67 20.0 0.375 0.349 508.0 9.52 8.86 488.95 HSS18.000x0.500 93.54 18.0 0.5 0.465 457.2 12.7 11.81 431.8 HSS18.000x0.375 70.66 18.0 0.375 0.349 457.2 9.52 8.86 438.15 HSS16.000x0.625 103.0 16.0 0.625 0.581 406.4 15.88 14.76 374.65 HSS16.000x0.500 82.85 16.0 0.5 0.465 406.4 12.7 11.81 381.0 HSS16.000x0.438 72.87 16.0 0.438 0.407 406.4 11.13 10.34 384.15 HSS16.000x0.375 62.64 16.0 0.375 0.349 406.4 9.52 8.86 387.35 HSS16.000x0.312 52.32 16.0 0.312 0.291 406.4 7.92 7.39 390.55 HSS16.000x0.250 42.09 16.0 0.25 0.233 406.4 6.35 5.92 393.7 HSS14.000x0.625 89.36 14.0 0.625 0.581 355.6 15.88 14.76 323.85 HSS14.000x0.500 72.16 14.0 0.5 0.465 355.6 12.7 11.81 330.2 HSS14.000x0.375 54.62 14.0 0.375 0.349 355.6 9.52 8.86 336.55 HSS14.000x0.312 45.65 14.0 0.312 0.291 355.6 7.92 7.39 339.75 HSS14.000x0.250 36.75 14.0 0.25 0.233 355.6 6.35 5.92 342.9 HSS12.750x0.500 65.48 12.8 0.5 0.465 325.12 12.7 11.81 299.72 HSS12.750x0.375 49.61 12.8 0.375 0.349 325.12 9.52 8.86 306.07 HSS12.750x0.250 33.41 12.8 0.25 0.233 325.12 6.35 5.92 312.42 HSS10.750x0.500 54.79 10.8 0.5 0.465 274.32 12.7 11.81 248.92 HSS10.750x0.375 41.59 10.8 0.375 0.349 274.32 9.52 8.86 255.27 HSS10.750x0.250 28.06 10.8 0.25 0.233 274.32 6.35 5.92 261.62 HSS10.000x0.625 62.64 10.0 0.625 0.581 254.0 15.88 14.76 222.25 HSS10.000x0.500 50.78 10.0 0.5 0.465 254.0 12.7 11.81 228.6 HSS10.000x0.375 38.58 10.0 0.375 0.349 254.0 9.52 8.86 234.95 HSS10.000x0.312 32.31 10.0 0.312 0.291 254.0 7.92 7.39 238.15 HSS10.000x0.250 26.06 10.0 0.25 0.233 254.0 6.35 5.92 241.3 HSS10.000x0.188 19.72 10.0 0.188 0.174 254.0 4.78 4.42 244.45 HSS9.625x0.500 48.77 9.63 0.5 0.465 244.6 12.7 11.81 219.2 HSS9.625x0.375 37.08 9.63 0.375 0.349 244.6 9.52 8.86 225.55 HSS9.625x0.312 31.06 9.63 0.312 0.291 244.6 7.92 7.39 228.75 HSS9.625x0.250 25.06 9.63 0.25 0.233 244.6 6.35 5.92 231.9 HSS9.625x0.188 18.97 9.63 0.188 0.174 244.6 4.78 4.42 235.05 HSS8.625x0.625 53.45 8.63 0.625 0.581 219.2 15.88 14.76 187.45 HSS8.625x0.500 43.43 8.63 0.5 0.465 219.2 12.7 11.81 193.8 HSS8.625x0.375 33.07 8.63 0.375 0.349 219.2 9.52 8.86 200.15 HSS8.625x0.322 28.58 8.63 0.322 0.3 219.2 8.18 7.62 202.84 HSS8.625x0.250 22.38 8.63 0.25 0.233 219.2 6.35 5.92 206.5 HSS8.625x0.188 16.96 8.63 0.188 0.174 219.2 4.78 4.42 209.65 HSS7.625x0.375 29.06 7.63 0.375 0.349 193.8 9.52 8.86 174.75 HSS7.625x0.328 25.59 7.63 0.328 0.305 193.8 8.33 7.75 177.14 HSS7.500x0.500 37.42 7.5 0.5 0.465 190.5 12.7 11.81 165.1 HSS7.500x0.375 28.56 7.5 0.375 0.349 190.5 9.52 8.86 171.45 HSS7.500x0.312 23.97 7.5 0.312 0.291 190.5 7.92 7.39 174.65 HSS7.500x0.250 19.38 7.5 0.25 0.233 190.5 6.35 5.92 177.8 HSS7.500x0.188 14.7 7.5 0.188 0.174 190.5 4.78 4.42 180.95 HSS7.000x0.500 34.74 7.0 0.5 0.465 177.8 12.7 11.81 152.4 HSS7.000x0.375 26.56 7.0 0.375 0.349 177.8 9.52 8.86 158.75 HSS7.000x0.312 22.31 7.0 0.312 0.291 177.8 7.92 7.39 161.95 HSS7.000x0.250 18.04 7.0 0.25 0.233 177.8 6.35 5.92 165.1 HSS7.000x0.188 13.69 7.0 0.188 0.174 177.8 4.78 4.42 168.25 HSS7.000x0.125 9.19 7.0 0.125 0.116 177.8 3.17 2.95 171.45 HSS6.875x0.500 34.07 6.88 0.5 0.465 174.75 12.7 11.81 149.35 HSS6.875x0.375 26.06 6.88 0.375 0.349 174.75 9.52 8.86 155.7 HSS6.875x0.312 21.89 6.88 0.312 0.291 174.75 7.92 7.39 158.9 HSS6.875x0.250 17.71 6.88 0.25 0.233 174.75 6.35 5.92 162.05 HSS6.875x0.188 13.44 6.88 0.188 0.174 174.75 4.78 4.42 165.2 HSS6.625x0.500 32.74 6.63 0.5 0.465 168.4 12.7 11.81 143.0 HSS6.625x0.432 28.6 6.63 0.432 0.402 168.4 10.97 10.21 146.46 HSS6.625x0.375 25.06 6.63 0.375 0.349 168.4 9.52 8.86 149.35 HSS6.625x0.312 21.06 6.63 0.312 0.291 168.4 7.92 7.39 152.55 HSS6.625x0.280 18.99 6.63 0.28 0.26 168.4 7.11 6.6 154.18 HSS6.625x0.250 17.04 6.63 0.25 0.233 168.4 6.35 5.92 155.7 HSS6.625x0.188 12.94 6.63 0.188 0.174 168.4 4.78 4.42 158.85 HSS6.625x0.125 8.69 6.63 0.125 0.116 168.4 3.17 2.95 162.05 HSS6.000x0.500 29.4 6.0 0.5 0.465 152.4 12.7 11.81 127.0 HSS6.000x0.375 22.55 6.0 0.375 0.349 152.4 9.52 8.86 133.35 HSS6.000x0.312 18.97 6.0 0.312 0.291 152.4 7.92 7.39 136.55 HSS6.000x0.280 17.12 6.0 0.28 0.26 152.4 7.11 6.6 138.18 HSS6.000x0.250 15.37 6.0 0.25 0.233 152.4 6.35 5.92 139.7 HSS6.000x0.188 11.68 6.0 0.188 0.174 152.4 4.78 4.42 142.85 HSS6.000x0.125 7.85 6.0 0.125 0.116 152.4 3.17 2.95 146.05 HSS5.563x0.500 27.06 5.56 0.5 0.465 141.22 12.7 11.81 115.82 HSS5.563x0.375 20.8 5.56 0.375 0.349 141.22 9.52 8.86 122.17 HSS5.563x0.258 14.63 5.56 0.258 0.24 141.22 6.55 6.1 128.12 HSS5.563x0.188 10.8 5.56 0.188 0.174 141.22 4.78 4.42 131.67 HSS5.563x0.134 7.78 5.56 0.134 0.124 141.22 3.4 3.15 134.42 HSS5.500x0.500 26.73 5.5 0.5 0.465 139.7 12.7 11.81 114.3 HSS5.500x0.375 20.55 5.5 0.375 0.349 139.7 9.52 8.86 120.65 HSS5.500x0.258 14.46 5.5 0.258 0.24 139.7 6.55 6.1 126.59 HSS5.000x0.500 24.05 5.0 0.5 0.465 127.0 12.7 11.81 101.6 HSS5.000x0.375 18.54 5.0 0.375 0.349 127.0 9.52 8.86 107.95 HSS5.000x0.312 15.64 5.0 0.312 0.291 127.0 7.92 7.39 111.15 HSS5.000x0.258 13.08 5.0 0.258 0.24 127.0 6.55 6.1 113.89 HSS5.000x0.250 12.69 5.0 0.25 0.233 127.0 6.35 5.92 114.3 HSS5.000x0.188 9.67 5.0 0.188 0.174 127.0 4.78 4.42 117.45 HSS5.000x0.125 6.51 5.0 0.125 0.116 127.0 3.17 2.95 120.65 HSS4.500x0.375 16.54 4.5 0.375 0.349 114.3 9.52 8.86 95.25 HSS4.500x0.337 15.0 4.5 0.337 0.313 114.3 8.56 7.95 97.18 HSS4.500x0.237 10.8 4.5 0.237 0.22 114.3 6.02 5.59 102.26 HSS4.500x0.188 8.67 4.5 0.188 0.174 114.3 4.78 4.42 104.75 HSS4.500x0.125 5.85 4.5 0.125 0.116 114.3 3.17 2.95 107.95 HSS4.000x0.313 12.34 4.0 0.313 0.291 101.6 7.95 7.39 85.7 HSS4.000x0.250 10.0 4.0 0.25 0.233 101.6 6.35 5.92 88.9 HSS4.000x0.237 9.53 4.0 0.237 0.22 101.6 6.02 5.59 89.56 HSS4.000x0.226 9.12 4.0 0.226 0.21 101.6 5.74 5.33 90.12 HSS4.000x0.220 8.89 4.0 0.22 0.205 101.6 5.59 5.21 90.42 HSS4.000x0.188 7.66 4.0 0.188 0.174 101.6 4.78 4.42 92.05 HSS4.000x0.125 5.18 4.0 0.125 0.116 101.6 3.17 2.95 95.25 HSS3.500x0.313 10.66 3.5 0.313 0.291 88.9 7.95 7.39 73.0 HSS3.500x0.300 10.26 3.5 0.3 0.279 88.9 7.62 7.09 73.66 HSS3.500x0.250 8.69 3.5 0.25 0.233 88.9 6.35 5.92 76.2 HSS3.500x0.216 7.58 3.5 0.216 0.201 88.9 5.49 5.11 77.93 HSS3.500x0.203 7.15 3.5 0.203 0.189 88.9 5.16 4.8 78.59 HSS3.500x0.188 6.66 3.5 0.188 0.174 88.9 4.78 4.42 79.35 HSS3.500x0.125 4.51 3.5 0.125 0.116 88.9 3.17 2.95 82.55 HSS3.000x0.250 7.35 3.0 0.25 0.233 76.2 6.35 5.92 63.5 HSS3.000x0.216 6.43 3.0 0.216 0.201 76.2 5.49 5.11 65.23 HSS3.000x0.203 6.07 3.0 0.203 0.189 76.2 5.16 4.8 65.89 HSS3.000x0.188 5.65 3.0 0.188 0.174 76.2 4.78 4.42 66.65 HSS3.000x0.152 4.63 3.0 0.152 0.141 76.2 3.86 3.58 68.48 HSS3.000x0.134 4.11 3.0 0.134 0.124 76.2 3.4 3.15 69.39 HSS3.000x0.125 3.84 3.0 0.125 0.116 76.2 3.17 2.95 69.85 HSS2.875x0.250 7.02 2.88 0.25 0.233 73.15 6.35 5.92 60.45 HSS2.875x0.203 5.8 2.88 0.203 0.189 73.15 5.16 4.8 62.84 HSS2.875x0.188 5.4 2.88 0.188 0.174 73.15 4.78 4.42 63.6 HSS2.875x0.125 3.67 2.88 0.125 0.116 73.15 3.17 2.95 66.8 HSS2.500x0.250 6.01 2.5 0.25 0.233 63.5 6.35 5.92 50.8 HSS2.500x0.188 4.65 2.5 0.188 0.174 63.5 4.78 4.42 53.95 HSS2.500x0.125 3.17 2.5 0.125 0.116 63.5 3.17 2.95 57.15 HSS2.375x0.250 5.68 2.38 0.25 0.233 60.45 6.35 5.92 47.75 HSS2.375x0.218 5.03 2.38 0.218 0.203 60.45 5.54 5.16 49.38 HSS2.375x0.188 4.4 2.38 0.188 0.174 60.45 4.78 4.42 50.9 HSS2.375x0.154 3.66 2.38 0.154 0.143 60.45 3.91 3.63 52.63 HSS2.375x0.125 3.01 2.38 0.125 0.116 60.45 3.17 2.95 54.1 HSS1.900x0.188 3.44 1.9 0.188 0.174 48.26 4.78 4.42 38.71 HSS1.900x0.145 2.72 1.9 0.145 0.135 48.26 3.68 3.43 40.89 HSS1.900x0.120 2.28 1.9 0.12 0.111 48.26 3.05 2.82 42.16 HSS1.660x0.140 2.27 1.66 0.14 0.13 42.16 3.56 3.3 35.05 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - AISC (values via the ambaker1/aisc-csv extract, MIT): AISC Shapes Database v15.0 (W, S, C, MC, L, HSS): d, bf, tw, tf, k, t, HSS Ht, B, OD, tnom, tdes, A, weight — web — AISC publishes the database free of charge; dimensions are facts. aisc.org itself was not reachable from the build box — https://github.com/ambaker1/aisc-csv - AISC: Shapes Database (free download, v16.0 on aisc.org) - the values here are the v15.0 release; check the current release before relying on a size — web — Publisher's page; dimensions are facts — https://www.aisc.org/publications/steel-construction-manual-resources/ Free files (CC BY 4.0, Xem Studio; STEP + STL, 13 parts): https://xemstudio.com/files/hardware/aisc-hss-round/index.json API: https://xemstudio.com/api/geometry?object=aisc-hss-round