Bar stock sizes: 1018 steel round and square 1/8 to 6 in, 6061 aluminum square 1/4 to 8 in (distributor list, inches and mm) — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/ (sheet CC BY 4.0) Basis: Metals Depot's cold finish steel round, cold finish steel square and aluminium square listings; numbers only (one distributor, not a standard) Catalog version: 2026-10-20 Sizes: see table below - The sizes ONE distributor lists, not a standard: Metals Depot's cold finish 1018 (AISI 1018 / ASTM A108 / UNS G10180) round (53 diameters, 1/8 to 6 in) and square (30 sizes, 1/8 to 6 in) steel bar, and its 6061 aluminium square bar (30 sizes, 1/4 to 8 in; 6061-T6511 per ASTM B221 for most, the 1/4 in and 8 in listings say 6061-T6). 'yes' means it is listed; '-' means not listed by that distributor in that product, not that nobody makes it. Round diameter and square side are the nominal size; cold-finished bar is held to ASTM A108 tolerances that are not on the page. - Stock lengths on the same pages: 2, 4, 6 ft and 10 to 12 ft random lengths (steel), 2, 4, 6, 12 ft (aluminium), standard length tolerance ±1/4 in; some sizes also list 1, 8, 10, 12 and 20 ft. The page also lists 7, 8, 10 and 12 in rounds, but as hot rolled, not cold finish, so they are not in the table. - Left out: flat bar (the Metals Depot page gives no thickness × width list; Continental Steel's hot rolled A36 flat bar page lists 20 ft bars from 1/8 × 1/2 in but shows 25 of 280 items and has two typos in them, a wrong weight and a mislabelled width, so it is not tabulated), hex bar, metric round and square bar, hot rolled round, aluminium round and flat bar. Weights per foot are not on the Metals Depot pages used and are not computed here. - Bar stock is a plain round or square prism, so no file is drawn. For sections with real profiles see aluminum-angles, aisc-l-angles, the square and rectangular tube pages and the carbon rod sizes. size (in) decimal (in) mm (computed) steel round 1018 steel square 1018 aluminum square 6061 1/8 0.1250 3.17 yes yes - 3/16 0.1875 4.76 yes yes - 1/4 0.2500 6.35 yes yes yes 5/16 0.3125 7.94 yes yes yes 3/8 0.3750 9.52 yes yes yes 7/16 0.4375 11.11 yes yes - 1/2 0.5000 12.70 yes yes yes 9/16 0.5625 14.29 yes yes - 5/8 0.6250 15.88 yes yes yes 11/16 0.6875 17.46 yes yes - 3/4 0.7500 19.05 yes yes yes 13/16 0.8125 20.64 yes yes - 7/8 0.8750 22.22 yes yes yes 15/16 0.9375 23.81 yes yes - 1 1.0000 25.40 yes yes yes 1-1/16 1.0625 26.99 yes - - 1-1/8 1.1250 28.57 yes yes yes 1-3/16 1.1875 30.16 yes yes - 1-1/4 1.2500 31.75 yes yes yes 1-5/16 1.3125 33.34 yes - - 1-3/8 1.3750 34.92 yes yes yes 1-7/16 1.4375 36.51 yes - - 1-1/2 1.5000 38.10 yes yes yes 1-9/16 1.5625 39.69 yes - - 1-5/8 1.6250 41.27 yes yes yes 1-11/16 1.6875 42.86 yes - - 1-3/4 1.7500 44.45 yes yes yes 1-13/16 1.8125 46.04 yes - - 1-7/8 1.8750 47.62 yes - yes 1-15/16 1.9375 49.21 yes - - 2 2.0000 50.80 yes yes yes 2-1/16 2.0625 52.39 yes - - 2-1/8 2.1250 53.97 yes - - 2-3/16 2.1875 55.56 yes - - 2-1/4 2.2500 57.15 yes yes yes 2-5/16 2.3125 58.74 yes - - 2-3/8 2.3750 60.32 yes - - 2-7/16 2.4375 61.91 yes - - 2-1/2 2.5000 63.50 yes yes yes 2-9/16 2.5625 65.09 yes - - 2-5/8 2.6250 66.67 yes - - 2-11/16 2.6875 68.26 yes - - 2-3/4 2.7500 69.85 yes - yes 2-7/8 2.8750 73.02 yes - - 2-15/16 2.9375 74.61 yes - - 3 3.0000 76.20 yes yes yes 3-1/4 3.2500 82.55 yes - yes 3-1/2 3.5000 88.90 yes yes yes 3-3/4 3.7500 95.25 yes - - 4 4.0000 101.60 yes yes yes 4-1/2 4.5000 114.30 yes - yes 5 5.0000 127.00 yes yes yes 5-1/2 5.5000 139.70 - - yes 6 6.0000 152.40 yes yes yes 6-1/2 6.5000 165.10 - - yes 7 7.0000 177.80 - - yes 8 8.0000 203.20 - - yes Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Metals Depot: Cold finish steel round: 1018 (ASTM A108), 1/8 to 6 in diameters and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-round - Metals Depot: Cold finish steel square: 1018 (ASTM A108), 1/8 to 6 in and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-square - Metals Depot: Aluminum square bar: 6061-T6511 (ASTM B221), 1/4 to 8 in and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/aluminum-products/aluminum-square-bar - Continental Steel: Hot rolled flat bar A36: first 25 of 280 listings, 20 ft lengths (not used for a size table: its page has typos) — web — Publisher's page; dimensions are facts — https://titanium-stainless-steel.continentalsteel.com/printitems/steel-bars/hot-rolled-flat-bar?plpver=10 No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=bar-stock-sizes-round-square-steel-aluminum