Custom Oval duct transition fitting STL file 50x20 mm to 35.6x35.5 mm – transition: 20 mm 📦#9780

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Oval duct adapter provided as a STL 3D file. Side A offers an internal cross-section of 50x20 mm (oval) and side B 35.6x35.5 mm (nearly circular). On side A, the sleeve is 20 mm long, and on side B 35 mm. The transition section between the two ends is 20 mm long, for an overall length of 75 mm (sleeve A, transition and sleeve B). The external chamfers improve fit when inserting the adapter into ducts or hoses.
Generation date: 2026-07-02
3D Model Oval duct transition fitting STL file 50x20 mm to 35.6x35.5 mm – transition: 20 mm

3D model download

Free
  • oval-duct-transition-fitting-w_model9780-nb0_dd{id}.stl : 2 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 Oval duct transition fitting / hose-shaped reducer template, with the following values:
Parameter Value
#1 side A internal width 50 mm (≃1.97 in)
#2 side A internal height 20 mm (≃0.79 in)
#3 sleeve length on side A 20 mm (≃0.79 in)
#4 side B internal width 35.6 mm (≃1.40 in)
#5 side B internal height 35.5 mm (≃1.40 in)
#6 sleeve length on side B 35 mm (≃1 3/8 in)
#7 thickness 3 mm (≃1/8 in)
#8 transition length 20 mm (≃0.79 in)
#9 Y offset 0 mm (0 in)
#10 Z offset 0 mm (0 in)
#11 end chamfers outside
Metadata Value
external width on side A 56 mm (≃2.20 in)
external height on side A 26 mm (≃1.02 in)
external width on side B 41.6 mm (≃1 5/8 in)
external height on side B 41.5 mm (≃1 5/8 in)
total length 75 mm (≃2 15/16 in)
illustration of the parameters
Parameter overview

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

Parameter Label
#1 side A internal width widOA
#2 side A internal height heiOA
#3 sleeve length on side A lenSA
#4 side B internal width widOB
#5 side B internal height heiOB
#6 sleeve length on side B lenSB
#7 thickness thi
#8 transition length tra
#9 Y offset ofsY
#10 Z offset ofsZ
#11 end chamfers cha

Related 3D models

To search for a model based on your own parameters, go to the template page Oval duct transition fitting / hose-shaped reducer 

Oval adapter available as a STL 3D file. The internal cross-section on side A is 35x17.2 mm (oval), while on side B it is 30.6x30.5 mm (nearly circular). Both sleeves share an identical useful length of 8 mm. The transition section is 20 mm long, for a final overall length of 36 mm. The external edges at the ends are chamfered, which simplifies inserting the adapter into the duct.
Parameter Value Unit
side A internal width 35 mm
side A internal height 17.2 mm
sleeve length on side A 8 mm
side B internal width 30.6 mm
side B internal height 30.5 mm
sleeve length on side B 8 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
Oval duct adapter available as a STL 3D file. On side A, the internal cross-section is 35x17.2 mm (oval), whereas on side B it is 30x29.9 mm (nearly circular). The useful length is consistent on both ends: 8 mm. The central transition occupies 20 mm, bringing the overall length to 36 mm. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 35 mm
side A internal height 17.2 mm
sleeve length on side A 8 mm
side B internal width 30 mm
side B internal height 29.9 mm
sleeve length on side B 8 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
Oval duct transition adapter available as a STL 3D file. The internal cross-section on side A is 36.1x32.9 mm (oval), while on side B it is 28.5x28.4 mm (nearly circular). The useful lengths are 22 mm (A) and 42 mm (B), respectively. The central transition occupies 20 mm, bringing the overall length to 84 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 36.1 mm
side A internal height 32.9 mm
sleeve length on side A 22 mm
side B internal width 28.5 mm
side B internal height 28.4 mm
sleeve length on side B 42 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval hose adapter in STL 3D file format. On side A, the internal cross-section is 52x40 mm (oval), whereas on side B it is 44x43 mm (nearly circular). Each sleeve provides a useful length of 30 mm. Between the two sleeves, the transition runs over 20 mm, resulting in an overall length of 80 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 52 mm
side A internal height 40 mm
sleeve length on side A 30 mm
side B internal width 44 mm
side B internal height 43 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval pipe adapter in STL 3D file format. The internal cross-section on side A is 52x39 mm (oval), while on side B it is 47x46 mm (nearly circular). The useful sleeve length is the same on both sides, 30 mm. The transition section is 20 mm long, for a final overall length of 80 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 52 mm
side A internal height 39 mm
sleeve length on side A 30 mm
side B internal width 47 mm
side B internal height 46 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval connector available as a STL 3D file. The internal cross-section on side A is 53x52 mm (nearly circular), while on side B it is 50x28 mm (oval). On side A, the sleeve is 20 mm long, and on side B 30 mm. The transition section is 20 mm long, for a final overall length of 70 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 53 mm
side A internal height 52 mm
sleeve length on side A 20 mm
side B internal width 50 mm
side B internal height 28 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval hose adapter available as a STL 3D file. The internal cross-section on side A is 36.1x32.9 mm (oval), while on side B it is 31.6x31.5 mm (nearly circular). Both sleeves share an identical useful length of 42 mm. The transition section is 20 mm long, for a final overall length of 104 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 36.1 mm
side A internal height 32.9 mm
sleeve length on side A 42 mm
side B internal width 31.6 mm
side B internal height 31.5 mm
sleeve length on side B 42 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval duct coupling available as a STL 3D file. On side A, the internal cross-section is 20.1x20 mm (nearly circular), whereas on side B it is 35x15 mm (oval). A uniform useful length of 25 mm is available on both sleeves. The transition section between the two ends is 20 mm long, for an overall length of 70 mm (sleeve A, transition and sleeve B). The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 20.1 mm
side A internal height 20 mm
sleeve length on side A 25 mm
side B internal width 35 mm
side B internal height 15 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval coupling in STL 3D file format. Side A offers an internal cross-section of 43x35 mm (oval) and side B 58.1x58 mm (nearly circular). The useful lengths are 18 mm (A) and 25 mm (B), respectively. The transition section is 20 mm long, for a final overall length of 63 mm. The wall is on the thicker side at 4 mm. The internal chamfers help start the duct insertion more easily.
Parameter Value Unit
side A internal width 43 mm
side A internal height 35 mm
sleeve length on side A 18 mm
side B internal width 58.1 mm
side B internal height 58 mm
sleeve length on side B 25 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
STL 3D file for an oval connector. On side A, the internal cross-section is 88.9x34.9 mm (oval), whereas on side B it is 46x45 mm (nearly circular). The useful length is consistent on both ends: 10 mm. The transition links the two ends over 20 mm, with a total overall length of 40 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 88.9 mm
side A internal height 34.9 mm
sleeve length on side A 10 mm
side B internal width 46 mm
side B internal height 45 mm
sleeve length on side B 10 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval pipe adapter provided as a STL 3D file. The internal cross-section on side A is 100x70 mm, while on side B it is 80x40 mm. You get a sleeve of 5 mm on side A and 10 mm on side B. The transition section is 20 mm long, for a final overall length of 35 mm. The shell is relatively thick, with a wall thickness of 4 mm. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 100 mm
side A internal height 70 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
STL 3D file for an oval hose fitting. On side A, the internal cross-section is 80.1x80 mm (nearly circular), whereas on side B it is 80x40 mm (oval). The sleeve on side A provides a useful length of 5 mm, and on side B 10 mm. The transition section is 20 mm long, for a final overall length of 35 mm. The wall is on the thicker side at 4 mm. External chamfers at the ends help with engagement and assembly within the duct system.
Parameter Value Unit
side A internal width 80.1 mm
side A internal height 80 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
Oval pipe adapter available as a STL 3D file. On side A, the internal cross-section is 100x15 mm, whereas on side B it is 50x28 mm. The useful sleeve length is the same on both sides, 10 mm. The transition portion extends over 40 mm and the overall length, sleeves included, is 60 mm. The internal chamfers help start the duct insertion more easily.
Parameter Value Unit
side A internal width 100 mm
side A internal height 15 mm
sleeve length on side A 10 mm
side B internal width 50 mm
side B internal height 28 mm
sleeve length on side B 10 mm
thickness 2 mm
transition length 40 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval connector available as a STL 3D file. The internal cross-section on side A is 91x80 mm, while on side B it is 80x40 mm. The useful sleeve length on side A is 5 mm, while on side B it reaches 10 mm. The transition section between the two ends is 20 mm long, for an overall length of 35 mm (sleeve A, transition and sleeve B). The shell is relatively thick, with a wall thickness of 4 mm. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 91 mm
side A internal height 80 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
Oval pipe adapter provided as a STL 3D file. On side A, the internal cross-section is 100x80 mm, whereas on side B it is 80x40 mm. The sleeves also differ in useful length: 5 mm on side A and 10 mm on side B. Between the two sleeves, the transition runs over 20 mm, resulting in an overall length of 35 mm. With 4 mm of wall thickness, the adapter gains extra strength. External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 100 mm
side A internal height 80 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
STL 3D file for an oval duct adapter. The internal cross-section on side A is 160x37 mm (oval), while on side B it is 45.1x45 mm (nearly circular). The useful length is consistent on both ends: 20 mm. The transition links the two ends over 20 mm, with a total overall length of 60 mm. External chamfers at the ends help with engagement and assembly within the duct system. Side B is offset by 10 mm along the Y axis relative to side A.
Parameter Value Unit
side A internal width 160 mm
side A internal height 37 mm
sleeve length on side A 20 mm
side B internal width 45.1 mm
side B internal height 45 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 20 mm
Y offset 10 mm
Z offset 0 mm
end chamfers outside
Oval hose adapter provided as a STL 3D file. On side A, the internal cross-section is 105x35 mm, whereas on side B it is 105x34 mm. The useful sleeve length is the same on both sides, 40 mm. The transition links the two ends over 20 mm, with a total overall length of 100 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 105 mm
side A internal height 35 mm
sleeve length on side A 40 mm
side B internal width 105 mm
side B internal height 34 mm
sleeve length on side B 40 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
STL 3D file for an oval duct adapter. On side A, the internal cross-section is 100.1x100 mm (nearly circular), whereas on side B it is 80x40 mm (oval). You get a sleeve of 5 mm on side A and 10 mm on side B. The transition section is 20 mm long, for a final overall length of 35 mm. Wall thickness is generous (4 mm). External chamfers are added at the ends to make it easier to insert the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 100.1 mm
side A internal height 100 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
STL 3D file for an oval connector. Side A offers an internal cross-section of 23.1x11.7 mm (oval) and side B 19x18.9 mm (nearly circular). The sleeve on side A provides a useful length of 20 mm, and on side B 15 mm. The transition links the two ends over 40 mm, with a total overall length of 75 mm. Wall thickness is minimal at 1 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier. An offset of 8.8 mm along the Z axis is applied to side B relative to side A.
Parameter Value Unit
side A internal width 23.1 mm
side A internal height 11.7 mm
sleeve length on side A 20 mm
side B internal width 19 mm
side B internal height 18.9 mm
sleeve length on side B 15 mm
thickness 1 mm
transition length 40 mm
Y offset 0 mm
Z offset 8.8 mm
end chamfers inside
STL 3D file for an oval hose fitting. The internal cross-section on side A is 22.9x11.6 mm (oval), while on side B it is 18x17.9 mm (nearly circular). The useful sleeve length on side A is 20 mm, while on side B it reaches 10 mm. The central transition occupies 40 mm, bringing the overall length to 70 mm. With 1 mm of thickness, the wall remains flexible and material-efficient. Internal chamfers are added at the ends to make assembly and duct insertion easier. An offset of 8.7 mm along the Z axis is applied to side B relative to side A.
Parameter Value Unit
side A internal width 22.9 mm
side A internal height 11.6 mm
sleeve length on side A 20 mm
side B internal width 18 mm
side B internal height 17.9 mm
sleeve length on side B 10 mm
thickness 1 mm
transition length 40 mm
Y offset 0 mm
Z offset 8.7 mm
end chamfers inside
Oval connector provided as a STL 3D file. On both sides A and B, the internal cross-section is the same: 22.9x11.5 mm. Both sleeves share an identical useful length of 5 mm. The transition portion extends over 20 mm and the overall length, sleeves included, is 30 mm. The shell stays very lightweight, with only 1 mm of wall thickness. Internal chamfers at the ends improve assembly and make insertion smoother.
Parameter Value Unit
side A internal width 22.9 mm
side A internal height 11.5 mm
sleeve length on side A 5 mm
side B internal width 22.9 mm
side B internal height 11.5 mm
sleeve length on side B 5 mm
thickness 1 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval coupling provided as a STL 3D file. The internal cross-section on side A is 54x38 mm (oval), while on side B it is 43x42 mm (nearly circular). Both sleeves share an identical useful length of 30 mm. The transition section between the two ends is 20 mm long, for an overall length of 80 mm (sleeve A, transition and sleeve B). The ends are straight, with no chamfer at all.
Parameter Value Unit
side A internal width 54 mm
side A internal height 38 mm
sleeve length on side A 30 mm
side B internal width 43 mm
side B internal height 42 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none
Oval duct transition adapter provided as a STL 3D file. Side A offers an internal cross-section of 53x38 mm (oval) and side B 51x50 mm (nearly circular). Both sleeves share an identical useful length of 25 mm. The transition section is 20 mm long, for a final overall length of 70 mm. No chamfer is applied at the ends, so both the inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 53 mm
side A internal height 38 mm
sleeve length on side A 25 mm
side B internal width 51 mm
side B internal height 50 mm
sleeve length on side B 25 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none
Oval duct fitting provided as a STL 3D file. The internal cross-section on side A is 79x68 mm, while on side B it is 40x30 mm. On side A, the sleeve is 15 mm long, and on side B 100 mm. Between the two sleeves, the transition runs over 40 mm, resulting in an overall length of 155 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 79 mm
side A internal height 68 mm
sleeve length on side A 15 mm
side B internal width 40 mm
side B internal height 30 mm
sleeve length on side B 100 mm
thickness 3 mm
transition length 40 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval hose fitting available as a STL 3D file. On side A, the internal cross-section is 140x40 mm, whereas on side B it is 130x35 mm. On side A, the sleeve is 8 mm long, and on side B 6 mm. The transition portion extends over 20 mm and the overall length, sleeves included, is 34 mm. Internal chamfers at the ends improve assembly and make insertion smoother.
Parameter Value Unit
side A internal width 140 mm
side A internal height 40 mm
sleeve length on side A 8 mm
side B internal width 130 mm
side B internal height 35 mm
sleeve length on side B 6 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
STL 3D file for an oval duct fitting. The internal cross-section on side A is 120.1x120 mm (nearly circular), while on side B it is 80x40 mm (oval). On side A, the sleeve is 5 mm long, and on side B 10 mm. The central transition occupies 20 mm, bringing the overall length to 35 mm. A thickness of 4 mm provides good stiffness. The external chamfers improve fit when inserting the adapter into ducts or hoses.
Parameter Value Unit
side A internal width 120.1 mm
side A internal height 120 mm
sleeve length on side A 5 mm
side B internal width 80 mm
side B internal height 40 mm
sleeve length on side B 10 mm
thickness 4 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers outside
Oval connector available as a STL 3D file. On side A, the internal cross-section is 140x40 mm, whereas on side B it is 130x35 mm. The useful sleeve length on side A is 8 mm, while on side B it reaches 6 mm. The transition section between the two ends is 40 mm long, for an overall length of 54 mm (sleeve A, transition and sleeve B). The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 140 mm
side A internal height 40 mm
sleeve length on side A 8 mm
side B internal width 130 mm
side B internal height 35 mm
sleeve length on side B 6 mm
thickness 2 mm
transition length 40 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval connector available as a STL 3D file. On side A, the internal cross-section is 140x50 mm, whereas on side B it is 130x35 mm. You get a sleeve of 8 mm on side A and 6 mm on side B. The central transition occupies 40 mm, bringing the overall length to 54 mm. The internal chamfers help start the duct insertion more easily.
Parameter Value Unit
side A internal width 140 mm
side A internal height 50 mm
sleeve length on side A 8 mm
side B internal width 130 mm
side B internal height 35 mm
sleeve length on side B 6 mm
thickness 2 mm
transition length 40 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside
Oval duct transition adapter in STL 3D file format. Side A offers an internal cross-section of 150x40 mm and side B 130x35 mm. The sleeve on side A provides a useful length of 8 mm, and on side B 6 mm. Between the two sleeves, the transition runs over 40 mm, resulting in an overall length of 54 mm. Internal chamfers at the ends improve assembly and make insertion smoother.
Parameter Value Unit
side A internal width 150 mm
side A internal height 40 mm
sleeve length on side A 8 mm
side B internal width 130 mm
side B internal height 35 mm
sleeve length on side B 6 mm
thickness 2 mm
transition length 40 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside