Structural flat washers ASTM F436 (round, hardened): inside and outside diameter, thickness, 1/2 to 1 in — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/structural-washers-astm-f436/ (sheet CC BY 4.0) Basis: AFT Fasteners' F436 table (max / min) cross-checked against three seller listings (Albany County, Fabory, Lawson) and the ASTM F436 scope text; inches; 3 envelope files Catalog version: 2026-10-20 Overall (mm): length 50.8, width 50.8, height 4.496 - F436 washers are the hardened washers used with A325 / A490 structural bolts. They are much larger and thicker than a standard flat washer (a 1/2 in F436 washer is 1.063 in OD and up to .177 in thick), and a 7/8 in washer has a 15/16 in ID and 1.75 in OD. - How the AFT table was read: its headings put four values under 'outside diameter', then one under 'inside diameter' and one under 'thickness'. The only reading consistent with the three sellers is OD max / min, then ID max / min, then thickness max and min (1/2: OD 1.094 / 1.031 against a 1.063 nominal, ID .562 / .531 against a .531 listing, T .177 as listed; 7/8: ID .969 / .938 against 15/16; 1: OD 2.031 / 1.969 against 2 in, ID 1.156 / 1.125 against 1-1/8). AFT lists thickness max as .177 in for all five sizes and thickness min .097, .122, .122, .136, .136; the sellers print .136 to .177 (7/8 and 1) and .177 ±.007 (1/2). - ASTM F436 scope (from a 2007 preview excerpt): circular washers for nominal bolt sizes 1/4 to 4 in; beveled washers 1/2 to 1-1/2 in with a 1:6 bevel; extra-thick circular washers of 5/16 in thickness in sizes 1/2 to 1-1/2 in. The dimension tables themselves (Tables 2, 3, 4) are not in the excerpt, so square, beveled, clipped and extra-thick washers and sizes over 1 in are not tabled here. - Files: three plain annuli at the seller-printed nominals (1/2, 7/8, 1 in), thickness drawn at .177 in, the maximum all sources print; the 5/8 and 3/4 sizes are tabled but not drawn because their nominal OD was not printed by a seller read. Edge chamfer and clipped sides are not drawn. bolt size (in) OD max / min (in) ID max / min (in) thickness max / min (in) OD max / min (mm, computed) ID max / min (mm, computed) 1/2 1.094 / 1.031 .562 / .531 .177 / .097 27.79 / 26.19 14.27 / 13.49 5/8 1.344 / 1.281 .719 / .687 .177 / .122 34.14 / 32.54 18.26 / 17.45 3/4 1.500 / 1.438 .843 / .812 .177 / .122 38.1 / 36.53 21.41 / 20.62 7/8 1.781 / 1.719 .969 / .938 .177 / .136 45.24 / 43.66 24.61 / 23.83 1 2.031 / 1.969 1.156 / 1.125 .177 / .136 51.59 / 50.01 29.36 / 28.57 1/2 (listing) 1.063 nominal .531 .177 ±.007 Albany County Fasteners listing 7/8 (listing) 1.75 15/16 .136 to .177 Fabory listing 1 (listing titled ID 1-1/8) 2 1-1/8 5/32 (.136 to .177) Lawson listing Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - AFT Fasteners: ASTM F436 round structural washers: OD max / min, ID max / min, thickness max / min, 1/2 to 1 in (column headings on the page are ambiguous) — web — Publisher's page; dimensions are facts — https://aftfasteners.com/astm-f436-round-structural-washers-dimensions-mechanical-properties - Albany County Fasteners: Structural flat washer F436 plain, 1/2 in: ID .531, OD 1.063, thickness .177 (+/- .007) — web — Publisher's page; dimensions are facts — https://www.albanycountyfasteners.com/Structural-Flat-Washers-F436-Plain-p/1850-002.htm - Fabory: Structural flat washer F436 plain 7/8 in: ID 15/16, OD 1.75, thickness .136 to .177 — web — Publisher's page; dimensions are facts — https://www.fabory.com/en/structural-flat-washer-f436-plain-7-8%22/p/38096222001 - Lawson Products: ASTM F436 structural flat washer, plain, 1-1/8 in ID, 2 in OD, 5/32 in thick (.136 to .177) — web — Publisher's page; dimensions are facts — https://www.lawsonproducts.com/en-ca/products/structural-flat-washer-2-21582 - ASTM International (preview excerpt, iTeh): ASTM F436-07a excerpt: scope (circular 1/4 to 4 in, beveled 1:6 and extra thick 5/16 in for 1/2 to 1-1/2 in); dimensions are in Tables 2 to 4, not in the excerpt — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/58080/67e2ae2149134dc8a91c616c6aaa73b8/ASTM-F436-07a.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/structural-washers-astm-f436/index.json API: https://xemstudio.com/api/geometry?object=structural-washers-astm-f436