Complete dimensional specification for the carpi-2din enclosure — an ISO 7736 2DIN shell plus a display-capturing bezel, sized around a 7” 1024x600 HDMI panel and a Raspberry Pi 5. All dimensions in millimetres.
For Agents
This is the source of truth for every number in the Fusion model. If a dimension is changed in CAD, change it here too. Fusion’s API works in centimetres — every value below must be divided by 10 before it reaches the API. See fusion360-mcp-scripting.
Shell (chassis body)
| Feature | Value |
|---|---|
| Body W x H | 178 x 100 (ISO 7736 2DIN) |
| Depth used | 150 (160 is the typical practical max) |
| Wall thickness | 2.4 (FDM) |
| Interior cavity | 173.2 x 95.2 x ~147.6 |
| Front flange | 178 x 112 x 3 |
| Flange inner opening | 173.2 x 95.2 |
The body stays 178 wide so the unit still slides into a standard 2DIN dash slot. Only the 112 mm-tall flange overhangs, sitting outside the dash opening against the fascia.
Bezel
| Feature | Value |
|---|---|
| Outline | 178 x 112 |
| Front plate thickness | 3 |
| Rear pocket | 165.5 x 100.5, 5.5 deep |
| Screen opening | 156 x 88 |
The rear pocket is the panel seat: panel module is 165 x 100 x 5.5, so the pocket carries 0.5 mm total clearance in both axes and is exactly panel-depth. The 156 x 88 opening clears the 154.08 x 85.92 active area with ~0.96 mm of margin per side.
Display
| Property | Value |
|---|---|
| Panel | 7” 1024x600, HDMI |
| Module outline | 165 x 100 x 5.5 |
| Active area | 154.08 x 85.92 |
The 100 mm Problem
Design Gotcha — read before changing anything at the front
A 7” panel module is exactly 100 mm tall, which is the full 2DIN body height. It therefore cannot sit inside the shell at all — the shell’s usable interior is only 95.2 mm tall after 2.4 mm walls.
The resolution: the panel is captured in the bezel’s rear pocket, in front of the shell’s front flange. The flange’s inner opening (173.2 x 95.2) is narrower than the panel, so the flange face itself supports the panel top and bottom edges. The panel never enters the chassis cavity — only its ribbon/HDMI/power leads do.
This single fact drives the flange, the bezel pocket, the 5.5 mm pocket depth, and the screw pattern below.
Bezel-to-Shell Fastening
| Feature | Value |
|---|---|
| Screws | 4x M3 |
| Positions | (±85.5, ±35) |
| Bezel side | Countersunk clearance holes |
| Shell side | Internal bosses, radius 3.5, length 12, 2.6 pilot (self-tapping M3) |
Screw placement is doubly constrained
The screw must land outside the bezel’s panel pocket (so it bites bezel material, not the panel seat) and in a shell boss that stays inside the 178 mm width envelope (or the unit no longer fits the dash slot).
- Pocket half-width is 82.75 → the screw must be at |x| > 82.75.
- Shell half-width is 89, boss radius is 3.5 → the boss centre must be at |x| < 85.5.
That leaves a band of roughly 82.75 < |x| < 85.5. At x = ±85.5 the boss outer surface lands exactly on x = ±89 — flush with the 178 mm limit. There is essentially no room to move; treat this as a hard-derived value, not a preference.
The y = ±35 positions are unconstrained by the pocket (pocket half-height is 50.25, so ±35 is inside that band vertically) — X is the only tight axis.
Raspberry Pi 5 Mount
| Feature | Value |
|---|---|
| Hole pattern | 58 x 49 |
| Bosses | radius 3, 5 tall |
| Boss hole | 3.6 (M2.5 heat-set inserts) |
| Board centre | 109.6 from the front face |
| Rear clearance | ~10 from the back wall |
Orientation: the Pi’s 85 mm dimension runs across the enclosure width (X) and its 56 mm dimension runs along depth (Y). This puts the USB/Ethernet edge — which lives on an 85 mm side — facing the rear wall, lining up with the port window. It also makes the numbers close: board centre at 109.6 with a 56 mm depth puts the rear board edge at 137.6, i.e. 10 mm short of the 147.6 interior back wall.
Hole pattern maps as 58 across X, 49 along Y.
Openings
Rear port window
- 78 x 19 in the back wall, aligned to the Pi 5’s USB/Ethernet edge.
Cable notch
- 12 x 8 in the left wall near the front, for the USB-C power lead.
Ventilation
| Location | Pattern |
|---|---|
| Side walls | 6 slots per side, at z = ±30 from centre height |
| Top wall | 7 x 2 grid of 4 x 25 slots |
| Bottom wall | 7 x 2 grid of 4 x 25 slots |
Side vents at ±30 mm sit above and below the Pi board plane, giving a convection path across the SoC rather than along the PCB.
Derived Clearance Check
These follow from the numbers above and should stay true after any edit:
| Check | Result |
|---|---|
| Flange inner opening vs shell cavity | 173.2 x 95.2 — identical, flange is a pure picture-frame on the wall line |
| Panel height (100) vs cavity height (95.2) | Does not fit — panel must live in the bezel |
| Pocket vs panel clearance | 0.5 total in X and Y |
| Screen opening vs active area | 1.92 total in X, 2.08 total in Y |
| Boss outer edge at x = 85.5 + r3.5 | 89.0 = exactly the 178 mm half-width |
| Pi rear edge to back wall | 147.6 − 137.6 = 10.0 |