# MGN9, MGN12 and MGN15 rails, 150 to 400 mm > What are the MGN12 rail dimensions and hole spacing? - Category: Hardware › Motion - Kind: Hardware - Basis: HIWIN MGN catalogue rail section, hole pitch and counterbore (other brands match) - Page: https://xemstudio.com/objects/mgn-rails/ · JSON: https://xemstudio.com/api/geometry?object=mgn-rails · Plain text: https://xemstudio.com/objects/mgn-rails/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 - 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. ## 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 | 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 | ## 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 (12 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/mgn-rails/index.json - mgn9-rail-150: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-150.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-150.stl) — MGN9 rail 150 mm, 20 mm hole pitch - mgn9-rail-200: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-200.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-200.stl) — MGN9 rail 200 mm, 20 mm hole pitch - mgn9-rail-300: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-300.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-300.stl) — MGN9 rail 300 mm, 20 mm hole pitch - mgn9-rail-400: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-400.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn9-rail-400.stl) — MGN9 rail 400 mm, 20 mm hole pitch - mgn12-rail-150: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-150.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-150.stl) — MGN12 rail 150 mm, 25 mm hole pitch - mgn12-rail-200: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-200.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-200.stl) — MGN12 rail 200 mm, 25 mm hole pitch - mgn12-rail-300: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-300.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-300.stl) — MGN12 rail 300 mm, 25 mm hole pitch - mgn12-rail-400: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-400.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn12-rail-400.stl) — MGN12 rail 400 mm, 25 mm hole pitch - mgn15-rail-150: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-150.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-150.stl) — MGN15 rail 150 mm, 40 mm hole pitch - mgn15-rail-200: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-200.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-200.stl) — MGN15 rail 200 mm, 40 mm hole pitch - mgn15-rail-300: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-300.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-300.stl) — MGN15 rail 300 mm, 40 mm hole pitch - mgn15-rail-400: [STEP](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-400.step) · [STL](https://xemstudio.com/files/hardware/mgn-linear-rails/mgn15-rail-400.stl) — MGN15 rail 400 mm, 40 mm hole pitch ## How it fits ### Goes in or on - [2020 aluminum extrusion](https://xemstudio.com/objects/2020-extrusion/): screwed to the extrusion face ### Connects to - [MGN9C/H, MGN12C/H and MGN15H carriages](https://xemstudio.com/objects/mgn-carriages/): carriage channel at the rail section ### Also needed - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): M3 in the counterbores ## Questions **What is the hole spacing on an MGN12 rail?** 25 mm, Ø3.5 holes with a Ø6 counterbore 4.5 deep for M3. MGN9 is 20 (counterbore 3.5 deep), MGN15 40. **What size is an MGN12 rail?** 12 wide × 8 tall. ## Fits with - [MGN9C/H, MGN12C/H and MGN15H carriages](https://xemstudio.com/objects/mgn-carriages/) - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/) - [2020 aluminum extrusion](https://xemstudio.com/objects/2020-extrusion/) - [T8 lead screw Tr8×8 envelope, 100 to 400 mm](https://xemstudio.com/objects/t8-lead-screw/)