# Hex nuts, hex jam nuts and heavy hex nuts, inch 7/8 to 1-1/2 (ASME B18.2.2): across flats, thickness, UNC / UNF

> What are the across-flats width and thickness of a 7/8 to 1-1/2 inch hex nut, jam nut or heavy hex nut?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: ASME B18.2.2 values as printed by Torqbolt (hex nuts), AFT Fasteners (jam, heavy hex, heavy hex jam) and Boltport (heavy hex nuts, cross-check); inches, max / min; 24 envelope files
- Page: https://xemstudio.com/objects/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/ · JSON: https://xemstudio.com/api/geometry?object=hex-nuts-inch-7-8-to-1-1-2-jam-heavy · Plain text: https://xemstudio.com/objects/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 66.0 | 57.15 | 38.227 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Four nut types are tabled, 7/8 to 1-1/2 in. Hex nut: F max 1.312, 1.500, 1.688, 1.875, 2.062, 2.250 in; thickness H max .776, .887, .999, 1.094, 1.206, 1.317 in. Hex jam nut: same F, thinner (H max .510 to .880 in). Heavy hex nut: wider F (1.438 to 2.375 in) and thicker (H max .885 to 1.505 in). Heavy hex jam nut: heavy-hex width with the same thickness as the regular jam nut. The existing page hex-nuts-inch covers #4-40 to 3/4-10 regular nuts.
- Cross-checks: the regular nut F and G equal the cap-screw head F and G on hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2 at every size, and heavy-hex F and G equal the heavy hex screw head. Heavy hex nut values are the same on two independent sites (AFT and Boltport). The regular hex nut thickness comes from a single table (Torqbolt, whose column headings were misaligned: the H min / max assignment is read from the values), and the jam-nut table from AFT's reprint of the 1987 standard. AFT also lists the UNC threads per inch for heavy jam nuts (9, 8, 7, 7, 6) and the 1 in jam row matches fasten.it Table 10 (H1 .519 / .575).
- One disagreement, shown rather than averaged: fasten.it Table 9 ('heavy hex flat nuts and flat jam nuts') prints H max 1.155, 1.282, 1.409, 1.536 in and H1 max .655, .782, .846, .911 in for 1-1/8 to 1-1/2, while AFT and Boltport print 1.139, 1.251, 1.378, 1.505 (heavy nut) and .639, .751, .815, .880 (jam). Their H min and H1 min values agree. The files and table use the AFT / Boltport numbers.
- Threads: UNC 9, 8, 7, 7, 6, 6 and UNF 14, 12, 12, 12, 12, 12 threads per inch (threaded-rod-inch-unc-unf-sizes). The files draw a plain bore at the thread major diameter, a hexagonal prism at F max and H max. No chamfer, washer face or thread is drawn. Not covered: hex thick nuts, nylon-insert (see nylon-insert-lock-nuts-inch-asme-b18-16-6) and flange nuts.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| bore (thread as plain cylinder) | Ø22.225 (7/8), 25.400 (1), 28.575 (1-1/8), 31.750 (1-1/4), 34.925 (1-3/8), 38.100 (1-1/2) mm at the thread major | hex cap screw or heavy hex screw of the same thread: hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2 (shank = E max) | designed | all |
| across flats F max | 1.312 / 1.500 / 1.688 / 1.875 / 2.062 / 2.250 in (hex, jam); 1.438 / 1.625 / 1.812 / 2.000 / 2.188 / 2.375 in (heavy) | wrench or socket of that nominal across-flats size (same F as the matching screw head) | designed | all |

## Sizes

| type | size (in) | UNC / UNF TPI | F across flats max / min | G across corners max / min | H thickness max / min | source | file: F max / H max (mm) |
|---|---|---|---|---|---|---|---|
| hex nut | 7/8 | 9 / 14 | 1.312 / 1.269 | 1.516 / 1.447 | .776 / .724 | Torqbolt | 33.32 / 19.71 |
| hex nut | 1 | 8 / 12 | 1.500 / 1.450 | 1.732 / 1.653 | .887 / .831 | Torqbolt | 38.1 / 22.53 |
| hex nut | 1-1/8 | 7 / 12 | 1.688 / 1.631 | 1.949 / 1.859 | .999 / .939 | Torqbolt | 42.88 / 25.37 |
| hex nut | 1-1/4 | 7 / 12 | 1.875 / 1.812 | 2.165 / 2.066 | 1.094 / 1.030 | Torqbolt | 47.62 / 27.79 |
| hex nut | 1-3/8 | 6 / 12 | 2.062 / 1.994 | 2.382 / 2.273 | 1.206 / 1.138 | Torqbolt | 52.37 / 30.63 |
| hex nut | 1-1/2 | 6 / 12 | 2.250 / 2.175 | 2.598 / 2.480 | 1.317 / 1.245 | Torqbolt | 57.15 / 33.45 |
| hex jam nut | 7/8 | 9 / 14 | 1.312 / 1.269 | 1.516 / 1.447 | .510 / .458 | AFT 1987 | 33.32 / 12.95 |
| hex jam nut | 1 | 8 / 12 | 1.500 / 1.450 | 1.732 / 1.653 | .575 / .519 | AFT 1987 | 38.1 / 14.6 |
| hex jam nut | 1-1/8 | 7 / 12 | 1.688 / 1.631 | 1.949 / 1.859 | .639 / .579 | AFT 1987 | 42.88 / 16.23 |
| hex jam nut | 1-1/4 | 7 / 12 | 1.875 / 1.812 | 2.165 / 2.066 | .751 / .687 | AFT 1987 | 47.62 / 19.08 |
| hex jam nut | 1-3/8 | 6 / 12 | 2.062 / 1.994 | 2.382 / 2.273 | .815 / .747 | AFT 1987 | 52.37 / 20.7 |
| hex jam nut | 1-1/2 | 6 / 12 | 2.250 / 2.175 | 2.598 / 2.480 | .880 / .808 | AFT 1987 | 57.15 / 22.35 |
| heavy hex nut | 7/8 | 9 / 14 | 1.438 / 1.394 | 1.660 / 1.589 | .885 / .833 | AFT + Boltport | 36.53 / 22.48 |
| heavy hex nut | 1 | 8 / 12 | 1.625 / 1.575 | 1.876 / 1.796 | 1.012 / .956 | AFT + Boltport | 41.27 / 25.7 |
| heavy hex nut | 1-1/8 | 7 / 12 | 1.812 / 1.756 | 2.093 / 2.002 | 1.139 / 1.079 | AFT + Boltport | 46.02 / 28.93 |
| heavy hex nut | 1-1/4 | 7 / 12 | 2.000 / 1.938 | 2.309 / 2.209 | 1.251 / 1.187 | AFT + Boltport | 50.8 / 31.78 |
| heavy hex nut | 1-3/8 | 6 / 12 | 2.188 / 2.119 | 2.526 / 2.416 | 1.378 / 1.310 | AFT + Boltport | 55.58 / 35.0 |
| heavy hex nut | 1-1/2 | 6 / 12 | 2.375 / 2.300 | 2.742 / 2.622 | 1.505 / 1.433 | AFT + Boltport | 60.32 / 38.23 |
| heavy hex jam nut | 7/8 | 9 / 14 | 1.438 / 1.394 | 1.660 / 1.589 | .510 / .458 | AFT | 36.53 / 12.95 |
| heavy hex jam nut | 1 | 8 / 12 | 1.625 / 1.575 | 1.876 / 1.796 | .575 / .519 | AFT | 41.27 / 14.6 |
| heavy hex jam nut | 1-1/8 | 7 / 12 | 1.812 / 1.756 | 2.093 / 2.002 | .639 / .579 | AFT | 46.02 / 16.23 |
| heavy hex jam nut | 1-1/4 | 7 / 12 | 2.000 / 1.938 | 2.309 / 2.209 | .751 / .687 | AFT | 50.8 / 19.08 |
| heavy hex jam nut | 1-3/8 | 6 / 12 | 2.188 / 2.119 | 2.526 / 2.416 | .815 / .747 | AFT | 55.58 / 20.7 |
| heavy hex jam nut | 1-1/2 | 6 / 12 | 2.375 / 2.300 | 2.742 / 2.622 | .880 / .808 | AFT | 60.32 / 22.35 |

## Where the files are

- Torqbolt: [ASME B18.2.2 hex nuts: F, G, H min / max in mm and inches, 1/4 to 4 in (nut table read for 7/8 to 1-1/2)](https://torqbolt.com/asme-b18-2-2-hex-nuts-dimensions-standards-specifications) — web — Publisher's page; dimensions are facts
- AFT Fasteners: [Hex jam nuts (ANSI/ASME B18.2.2-1987) and heavy hex jam nuts (B18.2.2-1987, R1999): F, G, H max / min](https://www.aftfasteners.com/hex-jam-nuts-dimensions-technical-information/) — web — Publisher's page; dimensions are facts
- AFT Fasteners: [Heavy hex nuts (ANSI/ASME B18.2.2): F basic / max / min, G, H basic / max / min](https://www.aftfasteners.com/heavy-hex-nuts-dimensions-technical-information/) — web — Publisher's page; dimensions are facts
- Boltport (mirror host as read): [ASME B18.2.2 heavy hex nuts: F, G, H basic / min / max, 1/4 to 4 in](https://www.boltport.com.ferrobend.com/standards/asme-b18.2.2/heavy-hex-nuts) — web — Publisher's page; dimensions are facts
- fasten.it: [ASME B18.2.2 Table 9: heavy hex flat nuts and flat jam nuts, 1-1/8 to 4 in (G, F, H, H1)](https://www.fasten.it/Norms/Norm/ASME_B18.2.2_TABLE_9) — web — Publisher's page; dimensions are facts
- fasten.it: [ASME B18.2.2 Table 10: heavy hex nuts and heavy hex jam nuts (G, F, H, H1; used here only to check the 1 in jam row)](https://fasten.it/norms/norm/asme_b18.2.2_table_10) — web — Publisher's page; dimensions are facts
- ASME: [ASME B18.2.2 Nuts for general applications (inch)](https://www.asme.org/codes-standards/find-codes-standards/b18-2-2-nuts-for-general-applications-machine-screw-nuts-hex-square-hex-flange-coupling-nuts-(inch-series)) — web — ASME; dimensions are facts
- Torqbolt: [ASME B18.31.3 threaded rods: nominal diameters and UNC / UNF threads per inch, #4 to 5 in](https://torqbolt.com/asme-b18-31-3-threaded-rods-dimensions-standards-specifications) — web — Publisher's page; dimensions are facts

## Free STEP/STL (24 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/index.json

- hex-nut-7-8-9: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-7-8-9.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-7-8-9.stl) — hex nut 7/8 envelope: hexagon 1.312 in across flats x .776 in thick (F max, H max), plain bore Ø0.8750 in at the thread major, thread not drawn
- hex-nut-1-8: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-8.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-8.stl) — hex nut 1 envelope: hexagon 1.500 in across flats x .887 in thick (F max, H max), plain bore Ø1.0000 in at the thread major, thread not drawn
- hex-nut-1-1-8-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-8-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-8-7.stl) — hex nut 1-1/8 envelope: hexagon 1.688 in across flats x .999 in thick (F max, H max), plain bore Ø1.1250 in at the thread major, thread not drawn
- hex-nut-1-1-4-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-4-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-4-7.stl) — hex nut 1-1/4 envelope: hexagon 1.875 in across flats x 1.094 in thick (F max, H max), plain bore Ø1.2500 in at the thread major, thread not drawn
- hex-nut-1-3-8-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-3-8-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-3-8-6.stl) — hex nut 1-3/8 envelope: hexagon 2.062 in across flats x 1.206 in thick (F max, H max), plain bore Ø1.3750 in at the thread major, thread not drawn
- hex-nut-1-1-2-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-2-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-nut-1-1-2-6.stl) — hex nut 1-1/2 envelope: hexagon 2.250 in across flats x 1.317 in thick (F max, H max), plain bore Ø1.5000 in at the thread major, thread not drawn
- hex-jam-nut-7-8-9: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-7-8-9.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-7-8-9.stl) — hex jam nut 7/8 envelope: hexagon 1.312 in across flats x .510 in thick (F max, H max), plain bore Ø0.8750 in at the thread major, thread not drawn
- hex-jam-nut-1-8: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-8.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-8.stl) — hex jam nut 1 envelope: hexagon 1.500 in across flats x .575 in thick (F max, H max), plain bore Ø1.0000 in at the thread major, thread not drawn
- hex-jam-nut-1-1-8-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-8-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-8-7.stl) — hex jam nut 1-1/8 envelope: hexagon 1.688 in across flats x .639 in thick (F max, H max), plain bore Ø1.1250 in at the thread major, thread not drawn
- hex-jam-nut-1-1-4-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-4-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-4-7.stl) — hex jam nut 1-1/4 envelope: hexagon 1.875 in across flats x .751 in thick (F max, H max), plain bore Ø1.2500 in at the thread major, thread not drawn
- hex-jam-nut-1-3-8-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-3-8-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-3-8-6.stl) — hex jam nut 1-3/8 envelope: hexagon 2.062 in across flats x .815 in thick (F max, H max), plain bore Ø1.3750 in at the thread major, thread not drawn
- hex-jam-nut-1-1-2-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-2-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/hex-jam-nut-1-1-2-6.stl) — hex jam nut 1-1/2 envelope: hexagon 2.250 in across flats x .880 in thick (F max, H max), plain bore Ø1.5000 in at the thread major, thread not drawn
- heavy-hex-nut-7-8-9: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-7-8-9.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-7-8-9.stl) — heavy hex nut 7/8 envelope: hexagon 1.438 in across flats x .885 in thick (F max, H max), plain bore Ø0.8750 in at the thread major, thread not drawn
- heavy-hex-nut-1-8: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-8.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-8.stl) — heavy hex nut 1 envelope: hexagon 1.625 in across flats x 1.012 in thick (F max, H max), plain bore Ø1.0000 in at the thread major, thread not drawn
- heavy-hex-nut-1-1-8-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-8-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-8-7.stl) — heavy hex nut 1-1/8 envelope: hexagon 1.812 in across flats x 1.139 in thick (F max, H max), plain bore Ø1.1250 in at the thread major, thread not drawn
- heavy-hex-nut-1-1-4-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-4-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-4-7.stl) — heavy hex nut 1-1/4 envelope: hexagon 2.000 in across flats x 1.251 in thick (F max, H max), plain bore Ø1.2500 in at the thread major, thread not drawn
- heavy-hex-nut-1-3-8-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-3-8-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-3-8-6.stl) — heavy hex nut 1-3/8 envelope: hexagon 2.188 in across flats x 1.378 in thick (F max, H max), plain bore Ø1.3750 in at the thread major, thread not drawn
- heavy-hex-nut-1-1-2-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-2-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-nut-1-1-2-6.stl) — heavy hex nut 1-1/2 envelope: hexagon 2.375 in across flats x 1.505 in thick (F max, H max), plain bore Ø1.5000 in at the thread major, thread not drawn
- heavy-hex-jam-nut-7-8-9: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-7-8-9.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-7-8-9.stl) — heavy hex jam nut 7/8 envelope: hexagon 1.438 in across flats x .510 in thick (F max, H max), plain bore Ø0.8750 in at the thread major, thread not drawn
- heavy-hex-jam-nut-1-8: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-8.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-8.stl) — heavy hex jam nut 1 envelope: hexagon 1.625 in across flats x .575 in thick (F max, H max), plain bore Ø1.0000 in at the thread major, thread not drawn
- heavy-hex-jam-nut-1-1-8-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-8-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-8-7.stl) — heavy hex jam nut 1-1/8 envelope: hexagon 1.812 in across flats x .639 in thick (F max, H max), plain bore Ø1.1250 in at the thread major, thread not drawn
- heavy-hex-jam-nut-1-1-4-7: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-4-7.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-4-7.stl) — heavy hex jam nut 1-1/4 envelope: hexagon 2.000 in across flats x .751 in thick (F max, H max), plain bore Ø1.2500 in at the thread major, thread not drawn
- heavy-hex-jam-nut-1-3-8-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-3-8-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-3-8-6.stl) — heavy hex jam nut 1-3/8 envelope: hexagon 2.188 in across flats x .815 in thick (F max, H max), plain bore Ø1.3750 in at the thread major, thread not drawn
- heavy-hex-jam-nut-1-1-2-6: [STEP](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-2-6.step) · [STL](https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/heavy-hex-jam-nut-1-1-2-6.stl) — heavy hex jam nut 1-1/2 envelope: hexagon 2.375 in across flats x .880 in thick (F max, H max), plain bore Ø1.5000 in at the thread major, thread not drawn

## Questions

**What size wrench for a 7/8 inch nut?**

1-5/16 in across flats for a regular hex or hex jam nut (F max 1.312 in); a heavy hex nut is 1-7/16 in (F max 1.438 in).

**How thick is a 1 inch jam nut?**

H max .575 in, H min .519 in (AFT's reprint of ASME B18.2.2-1987); a regular 1 in hex nut is .887 / .831 in.

**Is a heavy hex jam nut thinner than a heavy hex nut?**

Yes: the heavy hex jam nut has the heavy-hex width but the regular jam-nut thickness, .575 in max at 1 in against 1.012 in for the full heavy hex nut.

## Fits with

- [Hex nuts, inch: #4-40 to 3/4-10 (ASME B18.2.2)](https://xemstudio.com/objects/hex-nuts-inch/)
- [Hex cap screws and heavy hex screws, inch 7/8 to 1-1/2 (ASME B18.2.1): across flats F, head height H, thread length LT](https://xemstudio.com/objects/hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2/)
- [Hex bolts, inch: 1/4-20 to 3/4-10 (ASME B18.2.1)](https://xemstudio.com/objects/hex-bolts-inch/)
- [Flat washers, inch: SAE and USS, 1/4 to 3/4 in (ASME B18.21.1 Type A)](https://xemstudio.com/objects/flat-washers-inch/)
- [Structural flat washers ASTM F436 (round, hardened): inside and outside diameter, thickness, 1/2 to 1 in](https://xemstudio.com/objects/structural-washers-astm-f436/)
- [Nord-Lock wedge-locking washers NL3 to NL130: inner and outer diameter, thickness, enlarged-OD (sp) pairs, two tables compared](https://xemstudio.com/objects/nord-lock-wedge-locking-washers/)
- [Nylon-insert lock nuts, inch (ASME B18.16.6): 1/4 to 1-1/2 width across flats, across corners, height](https://xemstudio.com/objects/nylon-insert-lock-nuts-inch-asme-b18-16-6/)
- [Wing nuts: DIN 315 M4–M24 and ASME B18.17 #4 to 3/4 — boss, wing spread, height, wing thickness](https://xemstudio.com/objects/wing-nuts-din-315-asme-b18-17/)
- [Threaded rod, inch: #4 to 4 in, UNC and UNF threads per inch, major diameter in inches and mm, standard lengths](https://xemstudio.com/objects/threaded-rod-inch-unc-unf-sizes/)
- [Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID, OD, thickness + 12 washer files](https://xemstudio.com/objects/plain-washers-inch-type-b/)