SHS square hollow sections (EN 10219): 20x20 to 100x100 box section dimensions, corner radius + STEP/STL — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/en-10219-shs-square-hollow-sections/ (sheet CC BY 4.0) Basis: Roymech cold-formed hollow section tables (BS EN 10219:1997 values: size, wall, outside and inside radius, mass, area); radius band from EN 10219-2 as quoted by two mills Catalog version: 2026-10-20 Overall (mm): length 100.0 - SHS (square hollow section, also called square tube or box section) to EN 10219: designation B x B x t, B the outside side and t the wall, in mm. The US equivalent is square HSS (aisc-hss-rectangular-square, inch sizes). - Corner radius: EN 10219-2 gives a band for the outside radius, 1.6t to 2.4t for walls up to 6 mm, 2.0t to 3.0t for 6 to 10 mm, 2.4t to 3.6t above 10 mm (Nippon Steel Kenzai and the Ozdemir Boru declaration both print it). The radii in the table and the files are the Roymech section-table values, the middle of each band: 2t up to 6 mm wall, 2.5t at 6.3 and 8 mm, 3t at 12 mm and over, with inside radius = outside radius minus the wall. A real tube from one mill can sit anywhere in the band. - Sizes: every row of the Roymech table from 20 x 20 to 100 x 100 mm (53 sizes). The table goes to 400 x 400 mm; larger sizes are not listed here. - Files: 25 sizes drawn as 100 mm long extrusions along X, centred on y = 0, z = 0 on the bottom face. Each drawn section area matches the printed area within 1.5 %; the table check also confirms mass = 0.785 kg/m per cm2 within 1.5 % and ro - ri = t on every row. - Nominal dimensions only: EN 10219-2 tolerances on size, wall (-10 %), squareness and corner radius are not applied. - McMaster-Carr's metric square tube (12, 25, 40, 55, 100 mm) is EN 10305-5 precision tube, not EN 10219; it is linked as a CAD source, not as an equivalent. designation (H x B x t, mm) H (mm) B (mm) t (mm) outside radius ro (mm) inside radius ri (mm) ro / t mass (kg/m) area (cm2) 20x20x2 20 20 2 4 2 2 1.05 1.34 20x20x2.5 20 20 2.5 5 2.5 2 1.25 1.59 25x25x2 25 25 2 4 2 2 1.36 1.74 25x25x2.5 25 25 2.5 5 2.5 2 1.64 2.09 25x25x3 25 25 3 6 3 2 1.89 2.41 30x30x2 30 30 2 4 2 2 1.68 2.14 30x30x2.5 30 30 2.5 5 2.5 2 2.03 2.59 30x30x3 30 30 3 6 3 2 2.36 3.01 40x40x2 40 40 2 4 2 2 2.31 2.94 40x40x2.5 40 40 2.5 5 2.5 2 2.82 3.59 40x40x3 40 40 3 6 3 2 3.3 4.21 40x40x4 40 40 4 8 4 2 4.2 5.35 50x50x2 50 50 2 4 2 2 2.93 3.74 50x50x2.5 50 50 2.5 5 2.5 2 3.6 4.59 50x50x3 50 50 3 6 3 2 4.25 5.41 50x50x4 50 50 4 8 4 2 5.45 6.95 50x50x5 50 50 5 10 5 2 6.56 8.36 60x60x2 60 60 2 4 2 2 3.56 4.54 60x60x2.5 60 60 2.5 5 2.5 2 4.39 5.59 60x60x3 60 60 3 6 3 2 5.19 6.61 60x60x4 60 60 4 8 4 2 6.71 8.55 60x60x5 60 60 5 10 5 2 8.13 10.4 60x60x6 60 60 6 12 6 2 9.45 12.0 60x60x6.3 60 60 6.3 15.75 9.45 2.5 9.55 12.2 70x70x2.5 70 70 2.5 5 2.5 2 5.17 6.59 70x70x3 70 70 3 6 3 2 6.13 7.81 70x70x3.6 70 70 3.6 7.2 3.6 2 7.24 9.23 70x70x4 70 70 4 8 4 2 7.97 10.1 70x70x5 70 70 5 10 5 2 9.7 12.4 70x70x6 70 70 6 12 6 2 11.3 14.4 70x70x6.3 70 70 6.3 15.75 9.45 2.5 11.5 14.7 80x80x3 80 80 3 6 3 2 7.07 9.01 80x80x3.6 80 80 3.6 7.2 3.6 2 8.37 10.7 80x80x4 80 80 4 8 4 2 9.22 11.7 80x80x5 80 80 5 10 5 2 11.3 14.4 80x80x6 80 80 6 12 6 2 13.2 16.8 80x80x6.3 80 80 6.3 15.75 9.45 2.5 13.5 17.2 80x80x8 80 80 8 20 12 2.5 16.4 20.8 90x90x3 90 90 3 6 3 2 8.01 10.2 90x90x3.6 90 90 3.6 7.2 3.6 2 9.5 12.1 90x90x4 90 90 4 8 4 2 10.5 13.3 90x90x5 90 90 5 10 5 2 12.8 16.4 90x90x6 90 90 6 12 6 2 15.1 19.2 90x90x6.3 90 90 6.3 15.75 9.45 2.5 15.5 19.7 90x90x8 90 90 8 20 12 2.5 18.9 24.0 100x100x3 100 100 3 6 3 2 8.96 11.4 100x100x4 100 100 4 8 4 2 11.7 14.9 100x100x5 100 100 5 10 5 2 14.4 18.4 100x100x6 100 100 6 12 6 2 17.0 21.6 100x100x6.3 100 100 6.3 15.75 9.45 2.5 17.5 22.2 100x100x8 100 100 8 20 12 2.5 21.4 27.2 100x100x10 100 100 10 25 15 2.5 25.6 32.6 100x100x12 100 100 12 36 24 3 28.3 36.1 100x100x12.5 100 100 12.5 37.5 25 3 29.1 37.0 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Roymech: Square Hollow Sections, cold formed, BS EN 10219:1997: B, t, ro, ri, mass per metre, area for 20 x 20 to 400 x 400 mm — web — Dimensions and section data are facts; page says to check the standard for status — https://roymech.org/Useful_Tables/Sections/SHS_cf.html - Nippon Steel Kenzai: Hollow sections to EN 10219: external corner radius 1.6t-2.4t (t <= 6 mm), 2.0t-3.0t (6 < t <= 10), 2.4t-3.6t (t > 10) — web — Publisher's page; dimensions are facts — https://ns-kenzai.co.jp/english/021hollow_section_EN.html - Ozdemir Boru (EN 10219 declaration of performance): EN 10219 table 1: external corner profile R = 1.6T-2.4T / 2.0T-3.0T / 2.4T-3.6T by thickness range — web — Publisher's page; dimensions are facts — https://classic.lemu.dk/mediacdn/20160510075515/public/media/files/ydeevneerklaeringer/roer/ozdemir-boru/ozdemir_boru_en10219.pdf - McMaster-Carr: Square hollow sections / square and rectangular tube, steel (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/square-hollow-sections Free files (CC BY 4.0, Xem Studio; STEP + STL, 25 parts): https://xemstudio.com/files/hardware/en-10219-shs-square-hollow-sections/index.json API: https://xemstudio.com/api/geometry?object=en-10219-shs-square-hollow-sections