# Miniature linear guide (HIWIN MGN)

HIWIN MG series miniature linear guideway, standard width (MGN), sizes 7, 9, 12 and 15: the rail **MGNR** or a
carriage block **MGN-C** (standard) / **MGN-H** (long). Presets cover the catalogue's MGN7, MGN9 and MGN12 rails and
blocks.

## Geometry

Envelope for assemblies; the ball tracks, end seals, the end caps' shape and the grease nipple are not modelled.

- **Rail:** a bar WR × HR, length `rail_length`, along X, centred on the origin, its base on the XY plane. Mounting
  holes: through hole Ø d with a counterbore Ø D, h deep, from the top; the first hole E from the −X end, then at pitch
  P while at least E from the +X end (a standard rail, L = (n − 1) P + 2 E, has E at both ends).
- **Block:** a body W wide (Y) and L long (X), centred on the origin, from H1 (its underside above the rail's base) to H
  (its top), as it sits on a rail whose base is the XY plane. The rail's channel runs through it, modelled as the
  rail's own section WR × HR (HIWIN does not dimension the block's inner channel). Four tapped holes M × l from the
  top at B (across, Y) × C (along, X), drawn at the thread's nominal diameter (the thread is not modelled).

## Parameters

| Parameter | Meaning |
|---|---|
| `size` | `MGN7`, `MGN9`, `MGN12`, `MGN15` |
| `component` | `rail` (MGNR), `block-C` (MGN-C), `block-H` (MGN-H) |
| `rail_length` | rail length, mm (rail only); standard lengths are (n − 1) P + 2 E |

## Source

HIWIN Technologies Corp., *Linear Guideway Technical Information*, ©2024, FORM **G99TE24-2410**, section 2-4 "MG
Series" (official PDF: https://hiwin.com/wp-content/uploads/2026/08/HIWIN-Linear-Guideway-Catalog-1.pdf):

- 2-4-19 (1) "MGN-C / MGN-H", printed page 88 (PDF page 91): block and rail dimensions;
- 2-4-17, Table 2-4-15 "Standard and Maximum Lengths of Rail", printed page 85 (PDF page 88): pitch P, standard end
  distance E and the standard lengths L (n). The rail presets use the first standard length of each rail: MGNR7 40 (3
  holes), MGNR9 55 (3), MGNR12 70 (3), MGNR15 70 (2).

Block, mm (H: block top above the rail base; H1: clearance under the block; N: rail centre to block side; L: overall
length with end seals, L1: steel body length, not modelled separately):

| Size | H | H1 | N | W | B | B1 | C (C / H block) | L1 (C / H) | L (C / H) | M × l |
|---|---|---|---|---|---|---|---|---|---|---|
| MGN7 | 8 | 1.5 | 5 | 17 | 12 | 2.5 | 8 / 13 | 13.5 / 21.8 | 22.5 / 30.8 | M2 × 2.5 |
| MGN9 | 10 | 2 | 5.5 | 20 | 15 | 2.5 | 10 / 16 | 18.9 / 29.9 | 28.9 / 39.9 | M3 × 3 |
| MGN12 | 13 | 3 | 7.5 | 27 | 20 | 3.5 | 15 / 20 | 21.7 / 32.4 | 34.7 / 45.4 | M3 × 3.5 |
| MGN15 | 16 | 4 | 8.5 | 32 | 25 | 3.5 | 20 / 25 | 26.7 / 43.4 | 42.1 / 58.8 | M3 × 4 |

Rail, mm:

| Rail | WR | HR | D | h | d | P | E | Bolt |
|---|---|---|---|---|---|---|---|---|
| MGNR7 | 7 | 4.8 | 4.2 | 2.3 | 2.4 | 15 | 5 | M2 × 6 |
| MGNR9 | 9 | 6.5 | 6 | 3.5 | 3.5 | 20 | 7.5 | M3 × 8 |
| MGNR12 | 12 | 8 | 6 | 4.5 | 3.5 | 25 | 10 | M3 × 8 |
| MGNR15 | 15 | 10 | 6 | 4.5 | 3.5 | 40 | 15 | M3 × 10 |

The catalogue entries "MGN15x block", "MGN7/12x block" and "MGNx rail" are placeholders that name no HIWIN model and
are not presets.

Preset list: models of the step.parts catalogue (MIT), see `library/NOTICE.md`.