Print Fit & Tolerance · Free generator

Heat-insert fit mounting bridge

A three-boss mounting bridge with tapered insert lead-ins, blind fit bores, push-through access and reinforced screw flanges.

Free customization & STL download · No account needed

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Choose Continue editing in Nora3D inside the generator to keep your dimensions in an editable copy. Change features and export STEP CAD files.

Before you print

Base 120 x 50 x 6. Three diameter-16 bosses on 34 mm centers rise to Z=24. Each insert pilot begins at Z=10 and ends at the lead-in at Z=21. Lead-in tapers from diameter 5.6 to 8. Separate metal inserts; follow the insert manufacturer specification. Geometry has been digitally checked; this template has not been physically test-printed.

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Create a new owned Nora3D part document. Use millimeters, world XY as the base and +Z as height. Retain named native features and expose only the controls listed below.

1. Create **Base**, a 120 × 50 × 6 box, centered at X=0, Y=0, with its bottom at Z=0.
2. Create **Long rib**, a 100 × 5 × 8 box, centered at X=0, Y=0, with its bottom at Z=6.
3. Create **Boss -34**, radius 8, height 18, initially along +Z, with its base center at (-34, 0, 6).
4. Create **Boss 0**, radius 8, height 18, initially along +Z, with its base center at (0, 0, 6).
5. Create **Boss 34**, radius 8, height 18, initially along +Z, with its base center at (34, 0, 6).
6. Unite **Base**, **Long rib**, **Boss -34**, **Boss 0**, **Boss 34** as **Insert bridge blank**. Require one connected result.
7. Create **Insert pilot 0**, radius 2.2, height 15, initially along +Z, with its base center at (-34, 0, 10).
8. Create **Push access 0**, radius 1.2, height 12, initially along +Z, with its base center at (-34, 0, -1).
9. Create **Lead-in 0**, a frustum with bottom radius 2.8, top radius 4 and height 3, base center (-34, 0, 21).
10. Create **Insert pilot 1**, radius 2.2, height 15, initially along +Z, with its base center at (0, 0, 10).
11. Create **Push access 1**, radius 1.2, height 12, initially along +Z, with its base center at (0, 0, -1).
12. Create **Lead-in 1**, a frustum with bottom radius 2.8, top radius 4 and height 3, base center (0, 0, 21).
13. Create **Insert pilot 2**, radius 2.2, height 15, initially along +Z, with its base center at (34, 0, 10).
14. Create **Push access 2**, radius 1.2, height 12, initially along +Z, with its base center at (34, 0, -1).
15. Create **Lead-in 2**, a frustum with bottom radius 2.8, top radius 4 and height 3, base center (34, 0, 21).
16. Create **Mount -51 -17**, radius 2.6, height 10, initially along +Z, with its base center at (-51, -17, -1).
17. Create **Head -51 -17**, radius 4.5, height 3, initially along +Z, with its base center at (-51, -17, 3).
18. Create **Mount -51 17**, radius 2.6, height 10, initially along +Z, with its base center at (-51, 17, -1).
19. Create **Head -51 17**, radius 4.5, height 3, initially along +Z, with its base center at (-51, 17, 3).
20. Create **Mount 51 -17**, radius 2.6, height 10, initially along +Z, with its base center at (51, -17, -1).
21. Create **Head 51 -17**, radius 4.5, height 3, initially along +Z, with its base center at (51, -17, 3).
22. Create **Mount 51 17**, radius 2.6, height 10, initially along +Z, with its base center at (51, 17, -1).
23. Create **Head 51 17**, radius 4.5, height 3, initially along +Z, with its base center at (51, 17, 3).
24. Subtract **Insert pilot 0**, **Push access 0**, **Lead-in 0**, **Insert pilot 1**, **Push access 1**, **Lead-in 1**, **Insert pilot 2**, **Push access 2**, **Lead-in 2**, **Mount -51 -17**, **Head -51 -17**, **Mount -51 17**, **Head -51 17**, **Mount 51 -17**, **Head 51 -17**, **Mount 51 17**, **Head 51 17** from **Insert bridge blank**, consuming the tools; name the result **Heat-insert bridge**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Insert 1 pilot radius | 2.2 | 1.9–2.6 | 0.05 | Pilot radius for a physical insert fit trial; the fixed lead-in is larger. |
| Insert 2 pilot radius | 2.2 | 1.9–2.6 | 0.05 | Pilot radius for a physical insert fit trial; the fixed lead-in is larger. |
| Insert 3 pilot radius | 2.2 | 1.9–2.6 | 0.05 | Pilot radius for a physical insert fit trial; the fixed lead-in is larger. |

All unlisted dimensions, topology and feature order remain fixed. Radius controls are radii, not diameters. These are independent numeric ranges; do not introduce unsupported formula bindings or assume a fit standard from an example value.

Adjustable dimensions

Parameter	Default	Range	Step
Insert 1 pilot radius	2.2 mm	1.9–2.6 mm	0.05 mm
Insert 2 pilot radius	2.2 mm	1.9–2.6 mm	0.05 mm
Insert 3 pilot radius	2.2 mm	1.9–2.6 mm	0.05 mm