Permaswage® D10035 & D10235 90° Elbow Reducers: Complete Technical Guide & Part Number Reference
Permaswage® D10035 and D10235 90° Elbow Reducers are permanent aerospace tube fittings used in the Permaswage® 3,000 PSI Tube Connecting System. These fittings combine two important functions into a single component by changing the direction of flow 90 degrees while simultaneously transitioning between two different tube sizes.
The D10035 series covers standard tube sizes through 1 inch (-16), while the D10235 series continues the same fitting family for the larger 1-1/4 inch (-20) and 1-1/2 inch (-24) tube sizes.
Because these fittings eliminate the need for multiple adapters or separate reducer and elbow fittings, they simplify tube routing, reduce weight, and minimize potential leak paths. They are widely used throughout commercial aircraft, military aircraft, helicopters, and aerospace manufacturing where permanent, high-strength tube connections are required.
In this guide, we'll explain what Permaswage® D10035 and D10235 90° Elbow Reducers are, how they work, where they are commonly used, and provide a complete manufacturer part number reference.
What Is a Permaswage® D10035 90° Elbow Reducer?
A Permaswage® D10035 90° Elbow Reducer is a permanent tube fitting that connects two different tube sizes while changing the direction of flow by 90 degrees.
Unlike a standard elbow, which connects tubing of the same size, an elbow reducer allows a smooth transition from a larger tube to a smaller tube without requiring additional fittings or adapters.
During installation, both ends of the fitting are hydraulically swaged onto properly prepared tubing using approved Permaswage® tooling. Once installed, the fitting becomes a permanent part of the tube assembly and provides outstanding resistance to vibration, fatigue, and high-pressure service.
Why Use Permaswage® 90° Elbow Reducers?
The D10035 and D10235 fitting family offers numerous advantages for aerospace hydraulic and fluid conveyance systems.
- Changes tubing direction by 90 degrees
- Connects two different tube sizes
- Permanent leak-resistant installation
- No tube flaring required
- Designed for 3,000 PSI applications
- Excellent vibration resistance
- Outstanding fatigue performance
- Reduces the number of fittings required
- Simplifies tube routing in confined spaces
- Proven reliability in commercial and military aircraft
Permaswage® D10035 & D10235 90° Elbow Reducer Part Number Examples
The D10035 and D10235 series includes dozens of tube size combinations. The examples below represent some of the most commonly used configurations.
| Larger Tube Size | Reduced Tube Size | Part Number | Series |
|---|---|---|---|
| 1/4" | 3/16" | D10035D0403 | D10035 |
| 5/16" | 1/4" | D10035D0504 | D10035 |
| 3/8" | 1/4" | D10035D0604 | D10035 |
| 1/2" | 3/8" | D10035D0806 | D10035 |
| 5/8" | 1/2" | D10035D1008 | D10035 |
| 3/4" | 1/2" | D10035D1208 | D10035 |
| 1" | 3/4" | D10035D1612 | D10035 |
| 1-1/4" | 1" | D10235D2016 | D10235 |
| 1-1/2" | 1-1/4" | D10235D2420 | D10235 |
Available Tube Size Combinations
Permaswage® D10035 and D10235 elbow reducers are manufactured in numerous tube size combinations to support virtually every reducer application within the Permaswage® 3,000 PSI Tube Connecting System.
The fitting family covers reductions from:
- 1/4 inch to 3/16 inch
- 5/16 inch to 3/16 or 1/4 inch
- 3/8 inch to 3/16, 1/4, or 5/16 inch
- 1/2 inch to 3/16 through 3/8 inch
- 5/8 inch to 3/16 through 1/2 inch
- 3/4 inch to 3/16 through 5/8 inch
- 1 inch to 3/16 through 3/4 inch
- 1-1/4 inch to 1/4 through 1 inch
- 1-1/2 inch to 5/16 through 1-1/4 inch
This broad range of size combinations allows engineers and maintenance technicians to minimize unnecessary adapters while maintaining permanent, leak-resistant tube connections throughout an aircraft's hydraulic and fluid systems.
Permaswage® D10035 & D10235 90° Elbow Reducer Dimensions
The following dimensional reference table provides the manufacturer fitting dimensions for the Permaswage® D10035 and D10235 90° Elbow Reducer fitting family.
| Tube Size | Dimension C | Dimension A - Port 1 |
|---|---|---|
| 3/16" | 0.325 | 0.860 |
| 1/4" | 0.390 | 1.050 |
| 5/16" | 0.465 | 1.120 |
| 3/8" | 0.550 | 1.190 |
| 1/2" | 0.705 | 1.755 |
| 5/8" | 0.866 | 1.860 |
| 3/4" | 1.041 | 1.990 |
| 1" | 1.385 | 2.344 |
| 1-1/4" | 1.697 | 2.468 |
| 1-1/2" | 1.885 | 2.593 |
Permaswage® D10035 & D10235 Dimension B Reference
The table below provides Dimension B values for common 90° elbow reducer size combinations. Port 1 represents the larger tube size, while Port 2 represents the reduced tube size.
| Port 1 Tube Size | Port 2 Tube Size | Dimension B |
|---|---|---|
| 1/4" | 3/16" | 0.895 |
| 5/16" | 3/16" | 0.930 |
| 3/8" | 3/16" | 0.962 |
| 1/2" | 3/16" | 1.050 |
| 5/8" | 3/16" | 1.116 |
| 3/4" | 3/16" | 1.187 |
| 1" | 3/16" | 1.351 |
| 1-1/4" | 3/16" | 1.419 |
| 1-1/2" | 3/16" | 1.546 |
| 5/16" | 1/4" | 1.088 |
| 3/8" | 1/4" | 1.121 |
| 1/2" | 1/4" | 1.209 |
| 5/8" | 1/4" | 1.275 |
| 3/4" | 1/4" | 1.347 |
| 1" | 1/4" | 1.510 |
| 1-1/4" | 1/4" | 1.585 |
| 1-1/2" | 1/4" | 1.705 |
| 3/8" | 5/16" | 1.153 |
| 1/2" | 5/16" | 1.241 |
| 5/8" | 5/16" | 1.307 |
| 3/4" | 5/16" | 1.379 |
| 1" | 5/16" | 1.542 |
| 1-1/4" | 5/16" | 1.609 |
| 1-1/2" | 5/16" | 1.737 |
| 1/2" | 3/8" | 1.278 |
| 5/8" | 3/8" | 1.344 |
| 3/4" | 3/8" | 1.416 |
| 1" | 3/8" | 1.579 |
| 1-1/4" | 3/8" | 1.646 |
| 1-1/2" | 3/8" | 1.775 |
| 5/8" | 1/2" | 1.821 |
| 3/4" | 1/2" | 1.893 |
| 1" | 1/2" | 2.056 |
| 1-1/4" | 1/2" | 2.146 |
| 1-1/2" | 1/2" | 2.275 |
| 3/4" | 5/8" | 1.932 |
| 1" | 5/8" | 2.095 |
| 1-1/4" | 5/8" | 2.187 |
| 1-1/2" | 5/8" | 2.313 |
| 1" | 3/4" | 2.157 |
| 1-1/4" | 3/4" | 2.255 |
| 1-1/2" | 3/4" | 2.383 |
| 1-1/4" | 1" | 2.448 |
| 1-1/2" | 1" | 2.576 |
| 1-1/2" | 1-1/4" | 2.576 |
Common Aerospace Applications
Permaswage® 90° Elbow Reducers are used where tubing must both change direction and transition between different tube sizes.
- Aircraft hydraulic systems
- Fuel distribution systems
- Pneumatic systems
- Lubrication systems
- Environmental control systems
- Landing gear hydraulic circuits
- Flight control systems
- Engine fluid routing
- Military aircraft maintenance
- Aerospace manufacturing and MRO operations
How the D10035 & D10235 Elbow Reducers Work
After the tubing has been cut, deburred, and prepared, the Permaswage® 90° Elbow Reducer is positioned between two different tube sizes. Each end of the fitting is then permanently swaged onto its corresponding tube.
This allows the installation to perform two functions at once: change the direction of the line by 90 degrees and transition from one tube size to another. This can reduce the number of fittings required and help simplify tube routing in tight aerospace installations.
Related Permaswage® Fitting Families
- D10036 & D10136 Union Fittings
- D10045 Union Reducers
- D9856 & D10256 90° Elbow Fittings
- D9855 & D10255 Tee Fittings
- D10023 & D10223 Tee Reducers
- D9854 & D10254 Cross Fittings
- D10164 Bulkhead Union Fittings
Frequently Asked Questions
What is a Permaswage® D10035 fitting?
A D10035 fitting is a permanent 90° elbow reducer used to connect two different tube sizes while changing the direction of the line by 90 degrees.
What is the difference between D10035 and D10235?
D10035 covers standard smaller tube sizes from -03 through -16, while D10235 is used for larger -20 and -24 size applications.
What is the difference between a 90° elbow and a 90° elbow reducer?
A standard 90° elbow connects two tubes of the same size. A 90° elbow reducer connects two different tube sizes while also changing direction by 90 degrees.
Can Permaswage® elbow reducers be reused?
No. Permaswage® elbow reducers are permanent fittings and are not designed to be reused after installation.
What pressure system are these fittings designed for?
The D10035 and D10235 fitting families are part of the Permaswage® 3,000 PSI Tube Connecting System.
Where are elbow reducers commonly used?
They are commonly used in aerospace hydraulic, fuel, pneumatic, lubrication, and fluid conveyance systems where a tube size transition and 90° direction change are both required.
Why Buy Permaswage® 90° Elbow Reducers from Top Flight Tools?
At Top Flight Tools, we specialize in sourcing new, surplus, and hard-to-find Permaswage® fittings and tooling for aerospace and industrial applications.
Whether you need a D10035 90° Elbow Reducer, a D10235 larger-size elbow reducer, or another Permaswage® fitting family, our team can help identify the correct part number for your application.
Conclusion
Permaswage® D10035 and D10235 90° Elbow Reducers provide a permanent solution for changing tube direction while transitioning between different tube sizes. Their compact design, permanent swaged installation method, and broad range of size combinations make them an important fitting family within the Permaswage® 3,000 PSI Tube Connecting System.
For aerospace hydraulic, fuel, pneumatic, and fluid conveyance systems, these fittings help simplify routing while maintaining reliable long-term system performance.
⚠️ Disclaimer
Top Flight Tools (TFT) is an independent reseller and is not affiliated with, sponsored by, or endorsed by Permaswage® or Precision Castparts Corp. (PCC). All product names, trademarks, and registered trademarks are the property of their respective owners. Any reference to Permaswage® products, specifications, or part numbers is provided for informational purposes only. All Permaswage® trademarks and part numbers remain the property of their respective companies.
While every effort is made to ensure the accuracy of the information provided, it is the customer’s responsibility to verify all specifications, compatibility, and suitability of products for their intended application prior to use. TFT assumes no liability for errors, omissions, or the misuse or misapplication of this information, and disclaims any responsibility for damages resulting from reliance on it.