# All-metal prevailing-torque lock nuts: DIN 980 V / M, ISO 7042 M5–M36 and inch Stover-type / top-lock nuts — across flats, height

> What are the dimensions of a DIN 980 / ISO 7042 all-metal lock nut or an inch Stover-type (top-lock) nut?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it's DIN 980 table (withdrawn 1987), iTeh's ISO 7042:2012 sample pages (cross-checked against fasten.it's 2013 edition page and Dresselhaus' change list), Aspen Fasteners' Grade C and CDE's Grade 9 inch tables; numbers only
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- DIN 980 (all-metal prevailing torque hexagon nuts, in forms V and M) is withdrawn; fasten.it still prints its 05-1987 tables. V and M share the same dimensions, M3 to M39: pitch (coarse, and the fine pitches), s, e min and h min / max (the page's letters; h is the nut height). ISO 7042 (prevailing torque type, all-metal hexagon high nuts, property classes 5, 8, 10 and 12) replaces it for M5 to M36, with the sizes M3, M4, M7, M18, M22, M27, M33 and M39 cancelled, wrench sizes changed for M10, M12 and M14, lower heights and no fine threads (Dresselhaus). Wrench sizes in the withdrawn DIN 980 are 17, 19 and 22 mm for M10, M12 and M14 against 16, 18 and 21 mm in ISO 7042. M14 is in brackets in ISO 7042 ('avoid if possible').
- ISO 7042:2012 sample pages (iTeh) print for M5 to M36: da min / max, dw min, e min, h max / min, mw min, s max / min and the pitch Pb; the page does not print a separate nut height 'm'. fasten.it's 2013-edition page agrees on s, e and h for every size. In the 2013 / 2012 edition M12's h max is 13.30 mm; the 02-1998 edition on the same site prints 12 mm. The two lists are not interchangeable at M12 height.
- Inch rows are two distributor sheets with no standard cited: Aspen's Grade C 'Stover-equivalent' all-metal lock nut (conical top, chamfered corners; locking by controlled distortion of the top threads; one-way, top up) with width across flats (nominal, max, min), overall thickness (max, min) and hex height (min), 1/4 to 1; and CDE's Grade 9 top-lock nut, 1/4 to 1-1/2, the same columns without hex height. The Grade 9 sheet lists a much taller nut than the Grade C one at the same size (for example 1/4: 0.288 against 0.226 in). The sheets' hardness, proof load and temperature statements are not reproduced here.
- No file: the locking feature (distorted top or clamped element) and top chamfer profile are not published as numbers in any source read; an envelope hex would not be the part. Nylon-insert nuts are separate pages: nylon-insert-lock-nuts-iso-7040-din-985, nylon-insert-lock-nuts-inch-asme-b18-16-6. McMaster-Carr sells all-metal locknuts with per-part STEP; its Grade 5 and Grade 9 locknut categories are linked, not copied.

## Sizes

| standard / source | size | pitch (mm) | width across flats s | e min (mm) | height | other columns as printed |
|---|---|---|---|---|---|---|
| DIN 980 V / M (withdrawn 1987) | M3 | 0.5; fine — | 5.5 | 6.01 | 3.4 – 3.7 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M4 | 0.7; fine — | 7 | 7.66 | 3.9 – 4.2 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M5 | 0.8; fine — | 8 | 8.79 | 4.8 – 5.1 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M6 | 1; fine — | 10 | 11.05 | 5.7 – 6 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M7 | 1; fine — | 11 | 12.12 | 6.5 – 7 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M8 | 1.25; fine 1 | 13 | 14.38 | 7.5 – 8 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M10 | 1.5; fine 1 / 1.25 | 17 | 18.9 | 9 – 10 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M12 | 1.75; fine 1.25 / 1.5 | 19 | 21.1 | 11 – 12 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M14 | 2; fine 1.5 | 22 | 24.49 | 12 – 14 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M16 | 2; fine 1.5 | 24 | 26.75 | 14 – 16 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M18 | 2.5; fine 1.5 / 2 | 27 | 29.56 | 16 – 18 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M20 | 2.5; fine 1.5 / 2 | 30 | 32.95 | 18 – 20 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M22 | 2.5; fine 1.5 / 2 | 32 | 35.03 | 20 – 22 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M24 | 3; fine 2 | 36 | 39.55 | 22 – 24 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M27 | 3; fine 2 | 41 | 45.02 | 25 – 27 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M30 | 3.5; fine 2 | 46 | 50.85 | 28 – 30 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M33 | 3.5; fine 2 | 50 | 55.37 | 31 – 33 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M36 | 4; fine 3 | 55 | 60.79 | 34 – 36 (h min – h max) | — |
| DIN 980 V / M (withdrawn 1987) | M39 | 4; fine 3 | 60 | 66.44 | 37 – 39 (h min – h max) | — |
| ISO 7042:2012 (EN ISO 7042) | M5 | 0.8 | 8 / 7.78 | 8.79 | 4.8 – 5.1 (h min – h max) | da 5.00 – 5.75; dw min 6.88; mw min 3.52 |
| ISO 7042:2012 (EN ISO 7042) | M6 | 1 | 10 / 9.78 | 11.05 | 5.4 – 6 (h min – h max) | da 6.00 – 6.75; dw min 8.88; mw min 3.92 |
| ISO 7042:2012 (EN ISO 7042) | M8 | 1.25 | 13 / 12.73 | 14.38 | 7.14 – 8 (h min – h max) | da 8.00 – 8.75; dw min 11.63; mw min 5.15 |
| ISO 7042:2012 (EN ISO 7042) | M10 | 1.5 | 16 / 15.73 | 17.77 | 8.94 – 10 (h min – h max) | da 10.00 – 10.80; dw min 14.63; mw min 6.43 |
| ISO 7042:2012 (EN ISO 7042) | M12 | 1.75 | 18 / 17.73 | 20.03 | 11.57 – 13.3 (h min – h max) | da 12.00 – 13.00; dw min 16.63; mw min 8.3 |
| ISO 7042:2012 (EN ISO 7042) | (M14) | 2 | 21 / 20.67 | 23.36 | 13.4 – 14.1 (h min – h max) | da 14.00 – 15.10; dw min 19.64; mw min 9.68 |
| ISO 7042:2012 (EN ISO 7042) | M16 | 2 | 24 / 23.67 | 26.75 | 15.7 – 16.4 (h min – h max) | da 16.00 – 17.30; dw min 22.49; mw min 11.28 |
| ISO 7042:2012 (EN ISO 7042) | M20 | 2.5 | 30 / 29.16 | 32.95 | 19 – 20.3 (h min – h max) | da 20.00 – 21.60; dw min 27.7; mw min 13.52 |
| ISO 7042:2012 (EN ISO 7042) | M24 | 3 | 36 / 35 | 39.55 | 22.6 – 23.9 (h min – h max) | da 24.00 – 25.90; dw min 33.25; mw min 16.16 |
| ISO 7042:2012 (EN ISO 7042) | M30 | 3.5 | 46 / 45 | 50.85 | 27.3 – 30 (h min – h max) | da 30.00 – 32.40; dw min 42.75; mw min 19.44 |
| ISO 7042:2012 (EN ISO 7042) | M36 | 4 | 55 / 53.8 | 60.79 | 33.1 – 36 (h min – h max) | da 36.00 – 38.90; dw min 51.11; mw min 23.52 |
| inch, Grade C Stover-equivalent (Aspen) | 1/4 | — | 7/16 in (max 0.4385 / min 0.428) | — | 0.212 – 0.226 in overall (min – max); hex height min 0.145 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 5/16 | — | 1/2 in (max 0.5020 / min 0.489) | — | 0.258 – 0.273 in overall (min – max); hex height min 0.166 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 3/8 | — | 9/16 in (max 0.5645 / min 0.551) | — | 0.320 – 0.337 in overall (min – max); hex height min 0.198 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 7/16 | — | 11/16 in (max 0.6895 / min 0.675) | — | 0.365 – 0.385 in overall (min – max); hex height min 0.223 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 1/2 | — | 3/4 in (max 0.7520 / min 0.736) | — | 0.427 – 0.448 in overall (min – max); hex height min 0.262 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 9/16 | — | 7/8 in (max 0.8770 / min 0.861) | — | 0.473 – 0.496 in overall (min – max); hex height min 0.286 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 5/8 | — | 15/16 in (max 0.9395 / min 0.922) | — | 0.535 – 0.559 in overall (min – max); hex height min 0.329 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 3/4 | — | 1-1/8 in (max 1.1270 / min 1.088) | — | 0.617 – 0.665 in overall (min – max); hex height min 0.382 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 7/8 | — | 1-5/16 in (max 1.3145 / min 1.269) | — | 0.724 – 0.776 in overall (min – max); hex height min 0.450 | no standard cited |
| inch, Grade C Stover-equivalent (Aspen) | 1 | — | 1-1/2 in (max 1.5020 / min 1.450) | — | 0.831 – 0.887 in overall (min – max); hex height min 0.513 | no standard cited |
| inch, Grade 9 top lock (CDE) | 1/4 | — | 7/16 in (max 0.438 / min 0.428) | — | 0.274 – 0.288 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 5/16 | — | 1/2 in (max 0.500 / min 0.489) | — | 0.320 – 0.336 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 3/8 | — | 9/16 in (max 0.562 / min 0.551) | — | 0.398 – 0.415 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 7/16 | — | 11/16 in (max 0.688 / min 0.675) | — | 0.444 – 0.463 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 1/2 | — | 3/4 in (max 0.750 / min 0.736) | — | 0.542 – 0.573 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 9/16 | — | 7/8 in (max 0.875 / min 0.861) | — | 0.575 – 0.621 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 5/8 | — | 15/16 in (max 0.938 / min 0.922) | — | 0.625 – 0.731 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 3/4 | — | 1-1/8 in (max 1.125 / min 1.088) | — | 0.735 – 0.827 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 7/8 | — | 1-5/16 in (max 1.312 / min 1.269) | — | 0.823 – 0.922 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 1 | — | 1-1/2 in (max 1.500 / min 1.450) | — | 1.003 – 1.023 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 1-1/8 | — | 1-5/8 in (max 1.687 / min 1.631) | — | 1.161 – 1.181 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 1-1/4 | — | 1-7/8 in (max 1.875 / min 1.812) | — | 1.257 – 1.277 in overall (min – max) | no standard cited |
| inch, Grade 9 top lock (CDE) | 1-1/2 | — | 2-1/4 in (max 2.250 / min 2.175) | — | 1.511 – 1.531 in overall (min – max) | no standard cited |

## Where the files are

- fasten.it: [DIN 980 V and DIN 980 M prevailing torque all-metal hexagon nuts (withdrawn, 05-1987): P (coarse / fine), s, e min, h min / max, M3 to M39](https://fasten.it/norms/norm/din_980) — web — Reference page (tables reproduced there by permission of DIN); numbers only
- iTeh Standards: [ISO 7042:2012 sample pages: Table 1 (D, P, da max / min, dw min, e min, h max / min, mw min, s max / min), property classes 5, 8, 10, 12](https://cdn.standards.iteh.ai/samples/61366/7a4736de62ed4897a7ac651843665dcd/ISO-7042-2012.pdf) — web — Standards-body sample pages; numbers only
- fasten.it: [DIN EN ISO 7042 (04-2013, supersedes 02-1998): s, e min, h max / min, M5 to M36](https://fasten.it/norms/norm/din_en_iso_7042) — web — Reference page; numbers only
- Dresselhaus: [DIN 980 to DIN EN ISO 7042 change list: sizes M3, M4, M7, M18, M22, M27, M33, M39 cancelled; wrench sizes changed for M10, M12, M14; height decreased; fine threads cancelled](https://eshop.dresselhaus.de/en/Standardisation-overview/DIN-980-%3E-DIN-EN-ISO-7042.html) — web — Distributor page
- Aspen Fasteners: [Lock nut specs: Grade C Stover-equivalent all-metal lock nuts, inch: width across flats (nominal, max, min), overall thickness max / min, hex height min](https://www.aspenfasteners.com/content/pdf/locknut_specs.pdf) — web — Distributor data sheet; numbers only. The sheet cites no standard
- CDE Fasteners: [Top lock nuts, grade 9: width across flats (nominal, max, min), overall thickness max / min, 1/4 to 1-1/2](https://cdefasteners.com/sites/default/files/product-specs/nutstoplock9.pdf) — web — Distributor data sheet; numbers only. The sheet cites no standard
- McMaster-Carr: [Grade 5 steel locknuts (all-metal prevailing torque among them) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/grade-5-steel-locknuts) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Grade 9 locknuts (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/nuts/nut-type~locknut/fastener-strength-grade-class~sae-grade-9/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What is the height of an M8 ISO 7042 all-metal lock nut?**

8.00 mm max and 7.14 mm min (h), 13 mm across flats, per the ISO 7042:2012 sample pages and fasten.it.

**What is the difference between DIN 980 and ISO 7042?**

ISO 7042 replaces DIN 980 for M5 to M36: eight sizes cancelled (M3, M4, M7, M18, M22, M27, M33, M39), wrench sizes changed for M10 to M14, lower heights, no fine threads.

**How tall is a 1/4-20 Stover-type lock nut?**

0.212 to 0.226 in overall for Aspen's Grade C nut (7/16 in across flats); CDE's Grade 9 top-lock nut is 0.274 to 0.288 in.

## Fits with

- [Nyloc lock nuts, M2.5–M8 (DIN 985)](https://xemstudio.com/objects/nyloc-nuts-metric/)
- [Nylon-insert lock nuts (nyloc), ISO 7040 and DIN 985, M3–M36: width across flats, height, bearing diameter + M10–M30 envelope files](https://xemstudio.com/objects/nylon-insert-lock-nuts-iso-7040-din-985/)
- [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/)
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- [Slotted and castle nuts, DIN 935-1, M4–M36: across flats, height, slot width, collar, cotter pin size + envelope models](https://xemstudio.com/objects/slotted-castle-nuts-din-935/)