Slotted and castle nuts, inch (ASME B18.2.2): hex slotted 1/4 to 2 in, castle 1/4 to 1-1/4 in — across flats, height, slot width, cotter hole + envelope models — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/slotted-castle-nuts-inch-asme-b18-2-2/ (sheet CC BY 4.0) Basis: AFT Fasteners' ASME B18.2.2 hex slotted nut and castle nut tables (Engineers Edge and a Shopify-hosted castle sheet as cross-checks), McMaster-Carr's slotted-nut table for the cotter pin hole; eight envelope models as files Catalog version: 2026-10-20 Overall (mm): length 12.8, width 11.1, height 5.6 - Hex slotted nuts (AFT, citing ANSI / ASME B18.2.2), inches, 1/4 to 2: width across flats F (basic, then max / min), width across corners G max / min, thickness H (basic, then max / min), unslotted thickness T (max / min), slot width S (max / min). AFT's flattened table was read by header order, so check the standard if a figure matters. Engineers Edge prints the same F, H (as a decimal), T and S for the sizes it lists (1/4 and 3/4 to 1-1/2 read). Threads UNC, UNF or 8UN; steel nuts to ASTM A563 grade A or SAE J995 grade 2 unless specified (Engineers Edge). - Hex castle nuts (AFT, ANSI B18.2.2-1970 column, 1/4 to 1-1/4): the slots are cut in a cylinder whose diameter W (minimum) is a little under the hex width, with a fillet R at its base. T is the height of the hex part (basic, then max / min). The AFT page labels its last castle row '1-1/4' but prints a major diameter of 1.1250 beside it; the row's F of 1-7/8 matches the 1-1/4 slotted nut, so it is shown as 1-1/4. The castle slot widths equal the slotted-nut S for the same size. A Shopify-hosted castle sheet prints the same numbers with other column labels. AFT says the castle values for Grade 5 nuts are recommendations, not an industry norm. - Cotter pin hole diameter per McMaster-Carr (inches): Grade 5 slotted nuts and, separately, low-strength steel slotted nuts differ from 7/16 up (for example 1/2: 7/64 and 1/8; 7/8: 3/16 and 5/32; 1-1/4: 5/16 and 9/32). Both are shown; use the pin hole of the nut you buy. McMaster's Grade 5 heights differ from AFT's basic H in two places: 7/8 (McMaster 49/64, AFT basic 3/4; McMaster's low-strength nut is 3/4) and 1-1/4 (McMaster 1-3/32 = 1.094, AFT basic 1-1/16, AFT max 1.094); AFT's max / min brackets both values. - Files are Xem-drawn envelopes: hex at the basic width across flats and basic height, six slots (three straight cuts 60° apart) of the maximum published slot width S to the unslotted thickness (slotted nuts: T max, castle nuts: T basic); the castle collar is a plain cylinder at W min. The bore is a plain cylinder at the nominal thread major diameter; no chamfer, no washer face, no fillet R. Sizes drawn: slotted 1/4, 3/8, 1/2, 5/8, 3/4; castle 1/4, 1/2, 3/4. - McMaster-Carr sells slotted hex nuts and castellated nuts with per-part STEP; the categories are linked, not copied. Metric: slotted-castle-nuts-din-935. type size (in) F basic F max / min G max / min H basic H max / min T (unslotted thickness) S slot width max / min W min (castle collar dia) R (castle fillet) cotter pin hole, Grade 5 (McMaster, in) cotter pin hole, low-strength (McMaster, in) hex slotted nut (ASME B18.2.2) 1/4 7/16 0.438 / 0.428 0.505 / 0.488 7/32 0.226 / 0.212 0.14 / 0.12 0.10 / 0.07 — — 1/16 1/16 hex slotted nut (ASME B18.2.2) 5/16 1/2 0.500 / 0.489 0.577 / 0.557 17/64 0.273 / 0.258 0.18 / 0.16 0.12 / 0.09 — — 5/64 5/64 hex slotted nut (ASME B18.2.2) 3/8 9/16 0.562 / 0.551 0.650 / 0.628 21/64 0.337 / 0.320 0.21 / 0.19 0.15 / 0.12 — — 7/64 7/64 hex slotted nut (ASME B18.2.2) 7/16 11/16 0.688 / 0.675 0.794 / 0.768 3/8 0.385 / 0.365 0.23 / 0.21 0.15 / 0.12 — — 7/64 3/32 hex slotted nut (ASME B18.2.2) 1/2 3/4 0.750 / 0.736 0.866 / 0.840 7/16 0.448 / 0.427 0.29 / 0.27 0.18 / 0.15 — — 7/64 1/8 hex slotted nut (ASME B18.2.2) 9/16 7/8 0.875 / 0.861 1.010 / 0.982 31/64 0.496 / 0.473 0.31 / 0.29 0.18 / 0.15 — — 9/64 7/64 hex slotted nut (ASME B18.2.2) 5/8 15/16 0.938 / 0.922 1.083 / 1.051 35/64 0.559 / 0.535 0.34 / 0.32 0.24 / 0.18 — — 5/32 5/32 hex slotted nut (ASME B18.2.2) 3/4 1-1/8 1.125 / 1.088 1.299 / 1.240 41/64 0.665 / 0.617 0.40 / 0.38 0.24 / 0.18 — — 5/32 5/32 hex slotted nut (ASME B18.2.2) 7/8 1-5/16 1.312 / 1.269 1.516 / 1.447 3/4 0.776 / 0.724 0.52 / 0.49 0.24 / 0.18 — — 3/16 5/32 hex slotted nut (ASME B18.2.2) 1 1-1/2 1.500 / 1.450 1.732 / 1.653 55/64 0.887 / 0.831 0.59 / 0.56 0.30 / 0.24 — — 3/16 3/16 hex slotted nut (ASME B18.2.2) 1-1/8 1-11/16 1.688 / 1.631 1.949 / 1.859 31/32 0.999 / 0.939 0.64 / 0.61 0.33 / 0.24 — — — — hex slotted nut (ASME B18.2.2) 1-1/4 1-7/8 1.875 / 1.812 2.165 / 2.066 1-1/16 1.094 / 1.030 0.70 / 0.67 0.40 / 0.31 — — 5/16 9/32 hex slotted nut (ASME B18.2.2) 1-3/8 2-1/16 2.062 / 1.994 2.382 / 2.273 1-11/64 1.206 / 1.138 0.82 / 0.78 0.40 / 0.31 — — — — hex slotted nut (ASME B18.2.2) 1-1/2 2-1/4 2.250 / 2.175 2.598 / 2.480 1-9/32 1.317 / 1.245 0.86 / 0.82 0.46 / 0.37 — — — 5/16 hex slotted nut (ASME B18.2.2) 2 3 3.000 / 2.900 3.464 / 3.306 1-23/32 1.759 / 1.679 1.24 / 1.20 0.52 / 0.43 — — — 3/8 hex castle nut (ANSI B18.2.2-1970) 1/4 7/16 0.438 / 0.428 0.505 / 0.488 9/32 0.288 / 0.274 3/16 (max 0.20 / min 0.18) 0.10 / 0.07 0.371 0.094 1/16 1/16 hex castle nut (ANSI B18.2.2-1970) 5/16 1/2 0.500 / 0.489 0.577 / 0.557 21/64 0.336 / 0.320 15/64 (max 0.24 / min 0.22) 0.12 / 0.09 0.425 0.094 5/64 5/64 hex castle nut (ANSI B18.2.2-1970) 3/8 9/16 0.562 / 0.551 0.650 / 0.628 13/32 0.415 / 0.398 9/32 (max 0.29 / min 0.27) 0.15 / 0.12 0.478 0.094 7/64 7/64 hex castle nut (ANSI B18.2.2-1970) 7/16 11/16 0.688 / 0.675 0.794 / 0.768 29/64 0.463 / 0.444 19/64 (max 0.31 / min 0.29) 0.15 / 0.12 0.582 0.094 7/64 3/32 hex castle nut (ANSI B18.2.2-1970) 1/2 3/4 0.750 / 0.736 0.866 / 0.840 9/16 0.573 / 0.552 13/32 (max 0.42 / min 0.40) 0.18 / 0.15 0.637 0.125 7/64 1/8 hex castle nut (ANSI B18.2.2-1970) 9/16 7/8 0.875 / 0.861 1.010 / 0.982 39/64 0.621 / 0.598 27/64 (max 0.43 / min 0.41) 0.18 / 0.15 0.744 0.156 9/64 7/64 hex castle nut (ANSI B18.2.2-1970) 5/8 15/16 0.938 / 0.922 1.083 / 1.051 23/32 0.731 / 0.706 1/2 (max 0.51 / min 0.49) 0.24 / 0.18 0.797 0.156 5/32 5/32 hex castle nut (ANSI B18.2.2-1970) 3/4 1-1/8 1.125 / 1.088 1.299 / 1.240 13/16 0.827 / 0.798 9/16 (max 0.57 / min 0.55) 0.24 / 0.18 0.941 0.188 5/32 5/32 hex castle nut (ANSI B18.2.2-1970) 7/8 1-5/16 1.312 / 1.269 1.516 / 1.447 29/32 0.922 / 0.890 21/32 (max 0.67 / min 0.64) 0.24 / 0.18 1.097 0.188 3/16 5/32 hex castle nut (ANSI B18.2.2-1970) 1 1-1/2 1.500 / 1.450 1.732 / 1.653 1 1.018 / 0.982 23/32 (max 0.73 / min 0.70) 0.30 / 0.24 1.254 0.188 3/16 3/16 hex castle nut (ANSI B18.2.2-1970) 1-1/4 1-7/8 1.875 / 1.812 2.165 / 2.066 1-1/4 1.272 / 1.228 7/8 (max 0.89 / min 0.86) 0.40 / 0.31 1.570 0.250 5/16 9/32 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - AFT Fasteners: Hex slotted nuts, ANSI / ASME B18.2.2: F, G, H, T, S, FIM max / min per size 1/4 to 2 — web — Maker / distributor reference; numbers only. The page table is flattened; columns follow its header order — https://www.aftfasteners.com/hex-slotted-nuts-technical-information/ - Engineers Edge: Slotted hex nut dimensions (ASME B18.2.2): basic thread dia, F flat width, H thickness, T unslotted thickness, S slot width (1/4, 3/4 to 1-1/2 read) — web — Reference page; numbers only — https://ns2.engineersedge.com/slotted_hex_nut.htm - AFT Fasteners: Hex castle nuts, ANSI B18.2.2 (1970): F, G, H, T, S, R, W min, FIR per size 1/4 to 1-1/4 — web — Maker / distributor reference; numbers only — https://aftfasteners.com/hex-castle-nuts-technical-information - Castle nut sheet (hosted on a Shopify CDN, maker not named in the text read): Castle nuts, ANSI B18.2.2 (1970): same values as the AFT table with other column labels — web — Maker datasheet; numbers only — https://cdn2.shopify.com/s/files/1/0056/7856/3437/files/Nutscastle.pdf - McMaster-Carr: Slotted hex nuts (inch and metric, cotter pin diameter per size) (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/slotted-hex-nuts - McMaster-Carr: Castellated nuts (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/castellated-nuts Free files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/index.json API: https://xemstudio.com/api/geometry?object=slotted-castle-nuts-inch-asme-b18-2-2