{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "structural-washers-astm-f436", "name": "Structural flat washers ASTM F436 (round, hardened): inside and outside diameter, thickness, 1/2 to 1 in", "kind": "standard", "category": "Hardware", "group": "Fasteners", "year": null, "question": "What are the inside diameter, outside diameter and thickness of an ASTM F436 structural washer for a 1/2, 5/8, 3/4, 7/8 or 1 inch bolt?", "tags": [ "F436 washer", "structural washer", "hardened washer", "A325 washer", "A490 washer", "structural bolt washer", "ASTM F436", "round structural washer" ], "aliases": [ "f436 washer dimensions", "7/8 f436 washer od", "1/2 structural washer thickness", "f436 washer vs usS washer", "a325 bolt washer size 3/4", "f436 washer 1 inch id", "structural washer 5/8 dimensions", "astm f436 washer table", "hardened structural flat washer", "f436 washer 3/4 outside diameter" ], "overall_mm": { "length": 50.8, "width": 50.8, "height": 4.496 }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 3, "url": "https://xemstudio.com/objects/structural-washers-astm-f436/", "sheet_txt": "https://xemstudio.com/objects/structural-washers-astm-f436/sheet.txt", "sheet": { "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", "overall_mm": { "length": 50.8, "width": 50.8, "height": 4.496 }, "notes": [ "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." ], "table": { "columns": [ "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)" ], "rows": [ [ "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", "" ] ] } }, "sheet_text": "Structural flat washers ASTM F436 (round, hardened): inside and outside diameter, thickness, 1/2 to 1 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/structural-washers-astm-f436/ (sheet CC BY 4.0)\nBasis: 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\nCatalog version: 2026-10-20\n\nOverall (mm): length 50.8, width 50.8, height 4.496\n- 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.\n- 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).\n- 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.\n- 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.\n\nbolt size (in) OD max / min (in) ID max / min (in) thickness max / min (in) OD max / min (mm, computed) ID max / min (mm, computed)\n1/2 1.094 / 1.031 .562 / .531 .177 / .097 27.79 / 26.19 14.27 / 13.49\n5/8 1.344 / 1.281 .719 / .687 .177 / .122 34.14 / 32.54 18.26 / 17.45\n3/4 1.500 / 1.438 .843 / .812 .177 / .122 38.1 / 36.53 21.41 / 20.62\n7/8 1.781 / 1.719 .969 / .938 .177 / .136 45.24 / 43.66 24.61 / 23.83\n1 2.031 / 1.969 1.156 / 1.125 .177 / .136 51.59 / 50.01 29.36 / 28.57\n1/2 (listing) 1.063 nominal .531 .177 ±.007 Albany County Fasteners listing \n7/8 (listing) 1.75 15/16 .136 to .177 Fabory listing \n1 (listing titled ID 1-1/8) 2 1-1/8 5/32 (.136 to .177) Lawson listing \n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- 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\n- 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\n- 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\n- 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\n- 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\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/structural-washers-astm-f436/index.json\nAPI: https://xemstudio.com/api/geometry?object=structural-washers-astm-f436\n", "sources": [ { "publisher": "AFT Fasteners", "title": "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)", "url": "https://aftfasteners.com/astm-f436-round-structural-washers-dimensions-mechanical-properties", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Albany County Fasteners", "title": "Structural flat washer F436 plain, 1/2 in: ID .531, OD 1.063, thickness .177 (+/- .007)", "url": "https://www.albanycountyfasteners.com/Structural-Flat-Washers-F436-Plain-p/1850-002.htm", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Fabory", "title": "Structural flat washer F436 plain 7/8 in: ID 15/16, OD 1.75, thickness .136 to .177", "url": "https://www.fabory.com/en/structural-flat-washer-f436-plain-7-8%22/p/38096222001", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Lawson Products", "title": "ASTM F436 structural flat washer, plain, 1-1/8 in ID, 2 in OD, 5/32 in thick (.136 to .177)", "url": "https://www.lawsonproducts.com/en-ca/products/structural-flat-washer-2-21582", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "ASTM International (preview excerpt, iTeh)", "title": "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", "url": "https://cdn.standards.iteh.ai/samples/58080/67e2ae2149134dc8a91c616c6aaa73b8/ASTM-F436-07a.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false } ], "xem": { "status": "free-files", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "flat-washers-inch", "plain-washers-inch-type-b", "hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2", "hex-nuts-inch-7-8-to-1-1-2-jam-heavy", "nord-lock-wedge-locking-washers", "hex-bolts-inch", "large-washers-din-9021-iso-7093", "spring-lock-washers-din-127-b" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [ { "feature": "bore", "exact": "1/2 in .531 (13.49 mm), 7/8 in 15/16 (23.81 mm), 1 in 1-1/8 (28.58 mm)", "mates": "bolt of the same nominal size (A325 / A490 hex or heavy hex screw on hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2)", "fit": "slide", "files": "structural-washer-f436-" } ], "fit_classes": { "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.", "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.", "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).", "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.", "clamp": "split part that closes on the mating part with screws: make it at size.", "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change." }, "faq": [ { "q": "What is the OD of a 7/8 inch F436 washer?", "a": "1.75 in nominal (Fabory), printed as 1.781 max / 1.719 min by AFT; ID 15/16 in (.938 to .969 in), thickness .136 to .177 in." }, { "q": "How thick is an F436 washer?", "a": ".177 in maximum at every size read (1/2 to 1 in), with a minimum of .097 in at 1/2 and .136 in at 7/8 and 1 in (AFT)." }, { "q": "Is an F436 washer a hardened washer?", "a": "Yes: it is the hardened structural washer used with structural bolts; a 1/2 in washer is 1.063 in OD and .177 in thick (Albany County listing)." } ], "files_license": null, "offers": [ { "file": "structural-washer-f436-1-2", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-1-2.step", "stl": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-1-2.stl", "note": "ASTM F436 round structural washer for a 1/2 in bolt: plain annulus .531 in inside, 1.063 in outside (seller-printed nominal values), thickness .177 in = the maximum printed (thickness range .097 / .136 to .177 in)" }, { "file": "structural-washer-f436-7-8", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-7-8.step", "stl": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-7-8.stl", "note": "ASTM F436 round structural washer for a 7/8 in bolt: plain annulus 0.9375 in inside, 1.75 in outside (seller-printed nominal values), thickness .177 in = the maximum printed (thickness range .097 / .136 to .177 in)" }, { "file": "structural-washer-f436-1", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-1.step", "stl": "https://xemstudio.com/files/hardware/structural-washers-astm-f436/structural-washer-f436-1.stl", "note": "ASTM F436 round structural washer for a 1 in bolt: plain annulus 1.125 in inside, 2.0 in outside (seller-printed nominal values), thickness .177 in = the maximum printed (thickness range .097 / .136 to .177 in)" } ], "markdown": "https://xemstudio.com/objects/structural-washers-astm-f436/index.md" }