MGN9, MGN12 and MGN15 rails, 150 to 400 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mgn-rails/  (CC BY 4.0)
Basis: HIWIN MGN catalogue rail section, hole pitch and counterbore (other brands match)
Catalog version: 2026-10-20

Sizes: see table below
- Rail section W × H: MGN9 9 × 6.5; MGN12 12 × 8; MGN15 15 × 10. Lengths 150, 200, 300, 400.
- Holes Ø3.5 through with a Ø6 counterbore, 3.5 deep on MGN9 and 4.5 on MGN12 / MGN15, for M3 socket heads. Pitch 20 (MGN9), 25 (MGN12), 40 (MGN15).
- Holes are centred along each rail: the end hole sits 12.5 from the end on every MGN12; 5 (150) or 10 on the MGN9; 15, 20, 10 and 20 on the MGN15 150–400.
- Rail section drawn as a plain rectangle; the carriage files have the rail channel at this section.

rail  W  H  pitch  hole  counterbore  end hole (150/200/300/400)
MGN9  9  6.5  20  Ø3.5  Ø6 × 3.5  5 / 10 / 10 / 10
MGN12  12  8  25  Ø3.5  Ø6 × 4.5  12.5 / 12.5 / 12.5 / 12.5
MGN15  15  10  40  Ø3.5  Ø6 × 4.5  15 / 20 / 10 / 20

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- HIWIN: MGN series linear guideway catalogue — PDF, STEP — HIWIN site terms [verify license at link] — https://www.hiwin.com/en/products/linear-guideways/mgn-mgw-series
- Wikipedia: Linear-motion bearing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Linear-motion_bearing

Free files (CC BY 4.0, Xem Studio; STEP + STL, 12 parts): https://xemstudio.com/files/hardware/mgn-rails/index.json
API: https://xemstudio.com/api/geometry?object=mgn-rails