# Hexagon cap nuts, low type, DIN 917: M4–M12 width across flats, height, dome radius, thread depth

> What are the DIN 917 low cap nut dimensions (across flats, height, dome radius, thread depth) for M4 to M12?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: KIPP K1801 DIN 917 table (D, T min, H, SW, E, R), cross-checked against Böllhoff DIN 917 data sheets (M4–M8) and fasten.it's DIN 917 table
- Page: https://xemstudio.com/objects/cap-nuts-low-din-917/ · JSON: https://xemstudio.com/api/geometry?object=cap-nuts-low-din-917 · Plain text: https://xemstudio.com/objects/cap-nuts-low-din-917/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/)

**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

- Columns: thread, width across flats s, total height h, dome radius r, minimum thread depth t. Böllhoff gives the same h, s, r and t min for M4–M8.
- M10 is drawn at SW17 and M12 at SW19 (KIPP); older editions also list SW16 and SW18. Thread drawn as a blind plain bore at the major diameter.

## 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 |
|---|---|---|---|---|
| thread (blind plain bore at the major Ø) | d, min. depth t: M4 4.16 to M12 13.15; M8 9.21 | screw or stud; its end must stop short of t | designed | all |
| hexagon | s across flats: 7 (M4) to 19 (M12); M8 13 | wrench or socket | designed | all |

## Sizes

| thread | s | h | r | t |
|---|---|---|---|---|
| M4 | 7 | 5.5 | 8 | 4.16 |
| M5 | 8 | 7 | 10 | 4.96 |
| M6 | 10 | 9 | 12 | 6.71 |
| M8 | 13 | 12 | 15 | 9.21 |
| M10 | 17 | 14 | 20 | 10.65 |
| M12 | 19 | 16 | 25 | 13.15 |

## Where the files are

- KIPP (via Marek): [K1801 hex cap nut, low style DIN 917: D, T, H, SW, E, R](https://www.marek.eu/data/katalogove-listy/kipp/K1801.pdf) — web — Publisher's page; dimensions are facts
- Böllhoff: [DIN 917 hexagon cap nuts, low form, data sheet](https://eshop-hu.boellhoff.com/out/media/pdf/DIN_917_Stahl_06_AU___en.pdf) — web — Publisher's page; dimensions are facts
- fasten.it: [DIN 917 hexagon cap nuts, low type](https://www.fasten.it/Search/Suppliers/107) — web — Publisher's page; dimensions are facts

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/cap-nuts-low-din-917/index.json

- din917-m4: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m4.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m4.stl) — DIN 917 M4: SW7, h 5.5, dome R8, thread depth 4.16
- din917-m5: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m5.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m5.stl) — DIN 917 M5: SW8, h 7, dome R10, thread depth 4.96
- din917-m6: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m6.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m6.stl) — DIN 917 M6: SW10, h 9, dome R12, thread depth 6.71
- din917-m8: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m8.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m8.stl) — DIN 917 M8: SW13, h 12, dome R15, thread depth 9.21
- din917-m10: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m10.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m10.stl) — DIN 917 M10: SW17, h 14, dome R20, thread depth 10.65
- din917-m12: [STEP](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m12.step) · [STL](https://xemstudio.com/files/hardware/cap-nuts-low-din-917/din917-m12.stl) — DIN 917 M12: SW19, h 16, dome R25, thread depth 13.15

## Questions

**How tall is an M8 low cap nut?**

DIN 917 M8: 12 mm tall, 13 mm across flats, R15 dome, at least 9.21 mm of thread.

**How is DIN 917 different from DIN 1587?**

DIN 917 is the low type: an M8 is 12 mm tall against 15 mm for the DIN 1587 acorn nut.

## Fits with

- [Acorn (domed cap) nuts, DIN 1587 high type: M4–M24 dome diameter, overall height, across flats, thread depth](https://xemstudio.com/objects/acorn-cap-nuts-din-1587/)
- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)
- [Hex flange nuts, DIN 6923: M3–M20 across flats, flange diameter, height, flange thickness + M5–M16 envelope files](https://xemstudio.com/objects/flange-nuts-din-6923/)