# MGN9C/H, MGN12C/H and MGN15H carriages

> What are MGN12H carriage dimensions and mounting holes?

- Category: Hardware › Motion
- Kind: Hardware
- Basis: HIWIN MGN catalogue carriage envelope (L × W × H, H1) and mounting pattern
- Page: https://xemstudio.com/objects/mgn-carriages/ · JSON: https://xemstudio.com/api/geometry?object=mgn-carriages · Plain text: https://xemstudio.com/objects/mgn-carriages/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

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

## Notes

- Block envelopes with the rail channel at the exact rail section. The block's underside sits H1 above the rail bottom (MGN9 2.0, MGN12 3.0, MGN15 4.0), so the file's block height is H − H1: 8, 10, 12.
- Assembled height H from the rail bottom: MGN9 10, MGN12 13, MGN15 16.
- Four M3 holes, drawn at Ø3 (thread major), across × along the rail: MGN9H 15 × 16, MGN9C 15 × 10, MGN12H 20 × 20, MGN12C 20 × 15, MGN15H 25 × 25.
- C is the short block, H the long one; same width and height.

## 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 |
|---|---|---|---|---|
| rail holes | Ø3.5 through, counterbore Ø6 × 3.5 (MGN9) / 4.5 | M3 socket head screws | designed | all |
| carriage holes | M3 (Ø3 major) | M3 screws | designed | all |
| rail section | 9 × 6.5 / 12 × 8 / 15 × 10 | carriage channel | designed | all |

## Sizes

| carriage | L | W | H assembled | block height | holes across × along |
|---|---|---|---|---|---|
| MGN9C | 28.9 | 20 | 10 | 8 | 15 × 10 |
| MGN9H | 39.9 | 20 | 10 | 8 | 15 × 16 |
| MGN12C | 34.7 | 27 | 13 | 10 | 20 × 15 |
| MGN12H | 45.4 | 27 | 13 | 10 | 20 × 20 |
| MGN15H | 58.8 | 32 | 16 | 12 | 25 × 25 |

## Where the files are

- HIWIN: [MGN series linear guideway catalogue](https://www.hiwin.com/en/products/linear-guideways/mgn-mgw-series) — PDF, STEP — HIWIN site terms (verify at link)
- Wikipedia: [Linear-motion bearing](https://en.wikipedia.org/wiki/Linear-motion_bearing) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/mgn-carriages/index.json

- mgn9h-carriage: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9h-carriage.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9h-carriage.stl) — MGN9H carriage envelope 39.9 × 20 × 10 (H from rail bottom), 4 × M3 on 15 across × 16 along
- mgn9c-carriage: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9c-carriage.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9c-carriage.stl) — MGN9C carriage envelope 28.9 × 20 × 10 (H from rail bottom), 4 × M3 on 15 across × 10 along
- mgn12h-carriage: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12h-carriage.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12h-carriage.stl) — MGN12H carriage envelope 45.4 × 27 × 13 (H from rail bottom), 4 × M3 on 20 across × 20 along
- mgn12c-carriage: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12c-carriage.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12c-carriage.stl) — MGN12C carriage envelope 34.7 × 27 × 13 (H from rail bottom), 4 × M3 on 20 across × 15 along
- mgn15h-carriage: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15h-carriage.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15h-carriage.stl) — MGN15H carriage envelope 58.8 × 32 × 16 (H from rail bottom), 4 × M3 on 25 across × 25 along

## How it fits

### Goes in or on
- [MGN9, MGN12 and MGN15 rails, 150 to 400 mm](https://xemstudio.com/objects/mgn-rails/): channel on the rail section

### Alternatives
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/): LM8UU block on an 8 mm rod

### Also needed
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): 4 × M3

## Questions

**What are MGN12H carriage dimensions?**

45.4 long, 27 wide, 13 high from the rail bottom; four M3 on 20 × 20.

**MGN12C vs MGN12H?**

Same width and height; C is 34.7 long with holes 20 × 15, H is 45.4 long with holes 20 × 20.

## Fits with

- [MGN9, MGN12 and MGN15 rails, 150 to 400 mm](https://xemstudio.com/objects/mgn-rails/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [T8 flange nut: Ø10.2 body, Ø22 flange, 4 × Ø3.5 on 16](https://xemstudio.com/objects/t8-nut/)
- [SC8UU slide block for an LM8UU](https://xemstudio.com/objects/slide-block-sc8uu/)