Custom Round-to-Rectangular Tube Adapter STL 3D file ⌀20 mm to 37×16 mm, thickness 2 mm 📦#8237

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Download this file in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀20 mm and a rectangular section with inner dimensions 37×16 mm. The shell thickness is 2 mm and the total length is 110 mm.
Generation date: 2026-04-03
3D Model Round-to-Rectangular Tube Adapter STL 3D file ⌀20 mm to 37×16 mm, thickness 2 mm

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  • round-to-rectangular-adapter-d_model8237-nb0_dd{id}.stl : 1.1 Mo
STL Mesh quality : Linear deflection 0.0005 Angular deflection 0.05
No compliance warranty No compliance warranty
(Internal and private use, non-commercial – no distribution – no derivatives)
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Values for this model

This model was generated by the Round to rectangular adapter template, with the following values:
Parameter Value
#1 cylinder outer diameter 20 mm (≃0.79 in)
#2 cylinder inlet length 30 mm (≃1 3/16 in)
#3 rectangle internal length 37 mm (≃1.46 in)
#4 rectangle internal height 16 mm (≃5/8 in)
#5 rectangle inlet length 60 mm (≃2 3/8 in)
#6 offset Z 0 mm (0 in)
#7 offset Y 0 mm (0 in)
#8 total length 110 mm (≃4.33 in)
#9 thickness 2 mm (≃0.08 in)
#10 chamfer no chamfer
Metadata Value
Cylinder internal diameter 16 mm (≃5/8 in)
illustration of the parameters
Parameter overview

  • If the chamfer option on the ends is enabled, the chamfer length is equal to half the thickness.
  • The stop at the bottom of the rectangular section has a width equal to half the thickness.

Labels are used in the naming of the downloaded 3D files.

Parameter Label
#1 cylinder outer diameter diaC
#2 cylinder inlet length lentC
#3 rectangle internal length lenIR
#4 rectangle internal height heiIR
#5 rectangle inlet length lentR
#6 offset Z ofsZ
#7 offset Y ofsY
#8 total length lenT
#9 thickness thi
#10 chamfer cha

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To search for a model based on your own parameters, go to the template page Round to rectangular adapter 

Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀27 mm and a rectangular section with internal dimensions 33×30 mm. The wall thickness is 2 mm and the overall length is 115 mm.
Parameter Value Unit
cylinder outer diameter 27 mm
cylinder inlet length 20 mm
rectangle internal length 33 mm
rectangle internal height 30 mm
rectangle inlet length 75 mm
offset Z 0 mm
offset Y 0 mm
total length 115 mm
thickness 2 mm
chamfer no chamfer
Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀20 mm and a rectangular section with inner dimensions 26×26 mm. The shell thickness is 2 mm and the total length is 90 mm.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 30 mm
rectangle internal length 26 mm
rectangle internal height 26 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 90 mm
thickness 2 mm
chamfer no chamfer
Download this 3D model in STL format of a round-to-rectangular tube adapter with an outer diameter of ⌀48 mm and a rectangular section with internal dimensions 54×25 mm. The wall thickness is 2 mm and the overall length is 100 mm. The adapter has an offset of 10 mm along the Z axis. A chamfer is applied on the outside of the cylindrical end.
Parameter Value Unit
cylinder outer diameter 48 mm
cylinder inlet length 30 mm
rectangle internal length 54 mm
rectangle internal height 25 mm
rectangle inlet length 50 mm
offset Z 10 mm
offset Y 0 mm
total length 100 mm
thickness 2 mm
chamfer chamfer on t...
3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀49.5 mm and a rectangular section with internal dimensions 54×25 mm. The wall thickness is 2 mm and the total length is 100 mm. The adapter has an offset of 10 mm along the Z axis. A chamfer is applied on the outside of the cylindrical end to ease insertion.
Parameter Value Unit
cylinder outer diameter 49.5 mm
cylinder inlet length 30 mm
rectangle internal length 54 mm
rectangle internal height 25 mm
rectangle inlet length 50 mm
offset Z 10 mm
offset Y 0 mm
total length 100 mm
thickness 2 mm
chamfer chamfer on t...
3D file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀49.1 mm and a rectangular section with internal dimensions 53×43 mm. The shell thickness is 2 mm and the total length is 100 mm. The adapter has an offset of 10 mm along the Z axis. A chamfer is applied on the outside of the cylindrical end to ease insertion.
Parameter Value Unit
cylinder outer diameter 49.1 mm
cylinder inlet length 30 mm
rectangle internal length 53 mm
rectangle internal height 43 mm
rectangle inlet length 50 mm
offset Z 10 mm
offset Y 0 mm
total length 100 mm
thickness 2 mm
chamfer chamfer on t...
Download this model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀20 mm and a rectangular section with internal dimensions 24×16.4 mm. The shell thickness is 2 mm and the total length is 70 mm.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 10 mm
rectangle internal length 24 mm
rectangle internal height 16.4 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 70 mm
thickness 2 mm
chamfer no chamfer
Model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀29 mm and a rectangular section with internal dimensions 38×17 mm. The shell thickness is 2 mm and the overall length is 75 mm.
Parameter Value Unit
cylinder outer diameter 29 mm
cylinder inlet length 5 mm
rectangle internal length 38 mm
rectangle internal height 17 mm
rectangle inlet length 50 mm
offset Z 0 mm
offset Y 0 mm
total length 75 mm
thickness 2 mm
chamfer no chamfer
3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀20 mm and a rectangular section with inner dimensions 50×30 mm. The shell thickness is 3 mm and the overall length is 100 mm.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 30 mm
rectangle internal length 50 mm
rectangle internal height 30 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 100 mm
thickness 3 mm
chamfer no chamfer
Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀75 mm and a rectangular section with internal dimensions 35×20 mm. The wall thickness is 2 mm and the total length is 120 mm.
Parameter Value Unit
cylinder outer diameter 75 mm
cylinder inlet length 40 mm
rectangle internal length 35 mm
rectangle internal height 20 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀57 mm and a rectangular section with internal dimensions 29×19 mm. The wall thickness is 3 mm and the total length is 96 mm.
Parameter Value Unit
cylinder outer diameter 57 mm
cylinder inlet length 25 mm
rectangle internal length 29 mm
rectangle internal height 19 mm
rectangle inlet length 50 mm
offset Z 0 mm
offset Y 0 mm
total length 96 mm
thickness 3 mm
chamfer no chamfer
Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀57 mm and a rectangular section with internal dimensions 36×25.6 mm. The wall thickness is 3 mm and the overall length is 96 mm.
Parameter Value Unit
cylinder outer diameter 57 mm
cylinder inlet length 25 mm
rectangle internal length 36 mm
rectangle internal height 25.6 mm
rectangle inlet length 50 mm
offset Z 0 mm
offset Y 0 mm
total length 96 mm
thickness 3 mm
chamfer no chamfer
Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀32 mm and a rectangular section with inner dimensions 35×5 mm. The shell thickness is 2 mm and the total length is 120 mm.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 30 mm
rectangle internal length 35 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀32 mm and a rectangular section with internal dimensions 60×5 mm. The shell thickness is 2 mm and the total length is 120 mm.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 30 mm
rectangle internal length 60 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀33.5 mm and a rectangular section with inner dimensions 25×34 mm. The shell thickness is 3 mm and the total length is 84 mm.
Parameter Value Unit
cylinder outer diameter 33.5 mm
cylinder inlet length 25 mm
rectangle internal length 25 mm
rectangle internal height 34 mm
rectangle inlet length 39 mm
offset Z 0 mm
offset Y 0 mm
total length 84 mm
thickness 3 mm
chamfer no chamfer
Download this 3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀32 mm and a rectangular section with inner dimensions 50×5 mm. The shell thickness is 2 mm and the overall length is 120 mm.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 20 mm
rectangle internal length 50 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
Download this file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀32 mm and a rectangular section with inner dimensions 80×5 mm. The wall thickness is 2 mm and the overall length is 120 mm.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 30 mm
rectangle internal length 80 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀36 mm and a rectangular section with internal dimensions 50×5 mm. The wall thickness is 2 mm and the overall length is 120 mm.
Parameter Value Unit
cylinder outer diameter 36 mm
cylinder inlet length 20 mm
rectangle internal length 50 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀33 mm and a rectangular section with internal dimensions 75×12 mm. The wall thickness is 2 mm and the overall length is 85 mm.
Parameter Value Unit
cylinder outer diameter 33 mm
cylinder inlet length 31 mm
rectangle internal length 75 mm
rectangle internal height 12 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 85 mm
thickness 2 mm
chamfer no chamfer
Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀43 mm and a rectangular section with internal dimensions 25×6 mm. The wall thickness is 2 mm and the overall length is 100 mm.
Parameter Value Unit
cylinder outer diameter 43 mm
cylinder inlet length 25 mm
rectangle internal length 25 mm
rectangle internal height 6 mm
rectangle inlet length 19 mm
offset Z 0 mm
offset Y 0 mm
total length 100 mm
thickness 2 mm
chamfer no chamfer
Download this file in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀32 mm and a rectangular section with inner dimensions 90×5 mm. The wall thickness is 2 mm and the overall length is 120 mm.
Parameter Value Unit
cylinder outer diameter 32 mm
cylinder inlet length 30 mm
rectangle internal length 90 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 120 mm
thickness 2 mm
chamfer no chamfer
Download this 3D file in STL format of a round-to-rectangular adapter with an external diameter of ⌀20 mm and a rectangular section with inner dimensions 25×5 mm. The wall thickness is 3 mm and the overall length is 85 mm. A chamfer is present on the outside of the cylindrical end to ease insertion.
Parameter Value Unit
cylinder outer diameter 20 mm
cylinder inlet length 25 mm
rectangle internal length 25 mm
rectangle internal height 5 mm
rectangle inlet length 40 mm
offset Z 0 mm
offset Y 0 mm
total length 85 mm
thickness 3 mm
chamfer chamfer on t...
File in STL format of a round-to-rectangular adapter with an outer diameter of ⌀22 mm and a rectangular section with inner dimensions 14×11 mm. The shell thickness is 3 mm and the total length is 80 mm.
Parameter Value Unit
cylinder outer diameter 22 mm
cylinder inlet length 10 mm
rectangle internal length 14 mm
rectangle internal height 11 mm
rectangle inlet length 50 mm
offset Z 0 mm
offset Y 0 mm
total length 80 mm
thickness 3 mm
chamfer no chamfer
Download this 3D model in STL format of a round-to-rectangular adapter with an external diameter of ⌀55 mm and a rectangular section with inner dimensions 29×19 mm. The shell thickness is 2 mm and the total length is 80 mm.
Parameter Value Unit
cylinder outer diameter 55 mm
cylinder inlet length 29 mm
rectangle internal length 29 mm
rectangle internal height 19 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 80 mm
thickness 2 mm
chamfer no chamfer
Download this 3D model in STL format of a round-to-rectangular tube adapter with an external diameter of ⌀33 mm and a rectangular section with inner dimensions 100×13 mm. The wall thickness is 2 mm and the overall length is 90 mm.
Parameter Value Unit
cylinder outer diameter 33 mm
cylinder inlet length 30 mm
rectangle internal length 100 mm
rectangle internal height 13 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 90 mm
thickness 2 mm
chamfer no chamfer
Download this file in STL format of a round-to-rectangular adapter with an external diameter of ⌀22 mm and a rectangular section with inner dimensions 20×5 mm. The shell thickness is 2 mm and the total length is 60 mm.
Parameter Value Unit
cylinder outer diameter 22 mm
cylinder inlet length 20 mm
rectangle internal length 20 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 2 mm
chamfer no chamfer
3D model in STL format of a round-to-rectangular adapter with an outer diameter of ⌀24 mm and a rectangular section with inner dimensions 20×5 mm. The wall thickness is 2 mm and the total length is 60 mm.
Parameter Value Unit
cylinder outer diameter 24 mm
cylinder inlet length 20 mm
rectangle internal length 20 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 2 mm
chamfer no chamfer
Model in STL format of a round-to-rectangular adapter with an external diameter of ⌀25 mm and a rectangular section with internal dimensions 20×5 mm. The wall thickness is 2 mm and the total length is 60 mm.
Parameter Value Unit
cylinder outer diameter 25 mm
cylinder inlet length 20 mm
rectangle internal length 20 mm
rectangle internal height 5 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 60 mm
thickness 2 mm
chamfer no chamfer
3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀65 mm and a rectangular section with internal dimensions 56×71 mm. The wall thickness is 2 mm and the total length is 75 mm.
Parameter Value Unit
cylinder outer diameter 65 mm
cylinder inlet length 20 mm
rectangle internal length 56 mm
rectangle internal height 71 mm
rectangle inlet length 35 mm
offset Z 0 mm
offset Y 0 mm
total length 75 mm
thickness 2 mm
chamfer no chamfer
Download this 3D file in STL format of a round-to-rectangular adapter with an outer diameter of ⌀25 mm and a rectangular section with inner dimensions 57×33 mm. The wall thickness is 2 mm and the overall length is 75 mm. A chamfer is present on the outside of the cylindrical end.
Parameter Value Unit
cylinder outer diameter 25 mm
cylinder inlet length 30 mm
rectangle internal length 57 mm
rectangle internal height 33 mm
rectangle inlet length 20 mm
offset Z 0 mm
offset Y 0 mm
total length 75 mm
thickness 2 mm
chamfer chamfer on t...