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

length

12.8 mm

width

11.1 mm

height

5.6 mm

Notes

• 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.

Slotted and castle nuts, inch (ASME B18.2.2): hex slotted 1/4 to 2… size chart

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 8 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=slotted-castle-nuts-inch-asme-b18-2-2

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