--- title: How Tight Should AN Fittings Be? Correct Torque Specs for Motorsport and Custom Builds description: Learn the right AN fitting torque for leak-free fuel, oil, and coolant lines in motorsport and custom applications — with and without a torque wrench. --- [Skip to content](https://info.speedingparts.eu/how-tight-should-an-fittings-be-correct-torque-specs-for-motorsport-and-custom-builds#main-content) [![Speeding\_Logo\_black\_Byline\_pp-2](https://info.speedingparts.eu/hs-fs/hubfs/Speeding_Logo_black_Byline_pp-2.png?width=200&height=60&name=Speeding_Logo_black_Byline_pp-2.png)](https://www.speedingparts.eu) Open main navigation Close main navigation How can we help you? - There are no suggestions because the search field is empty. 1. [Speeding Support](https://info.speedingparts.eu/?hsLang=en) 2. [Hose and Fittings](https://info.speedingparts.eu/hose-and-fittings?hsLang=en) # How Tight Should AN Fittings Be? Correct Torque Specs for Motorsport and Custom Builds ## Learn the right AN fitting torque for leak-free fuel, oil, and coolant lines in motorsport and custom applications — with and without a torque wrench. ### AN fittings: Tightening torque ![](https://www.speedingparts.com/image/23591/nm-ft-lbs-an-fittings.jpg) To know how tight an AN fitting should sit, you need a special torque wrench. But it is also possible to tighten with regular hand tools by hand with some previous experience. This is actually how it's done and have been leak-free over years despite varying tightening torques where the fittings has been tighten by "feel". There are a few things to keep in mind if you want to do this correctly with torque. 1. **Tightening torque AN-hose ends** 2. **Tightening torque AN-hose**     #### Tightening torque AN-fittings Correct AN hose end tightening torque can be found here. **AN4** - 16nm **AN6** - 22nm **AN8** - 39nm **AN10** - 49nm **AN12** - 62nm **AN16** - 94nm **AN20** - 115nm ![](https://www.speedingparts.com/image/23590/AN-fittings-torque-collar.jpg) **This can first be threaded by hand until it stops, then tighten with tools.**     #### Tightening torque AN-hose The tightening torque for AN hose is when you tighten the part that is mounted against a hose, the part without a thread. These elements only apply to AN fittings in aluminum, not pipe or other fittings. For best results, if using a special torque wrench, tighten to the lower part of the torque range. If it leaks, tighten it until the leak ceases (without exceeding the maximum torque). Lubricate the threads and sealing surfaces lightly with oil before mounting as you want to avoid dry mounting whenever possible.       **AN4** - 8,3-11,66ft-lb - 11,25-15,8nm **AN6** - 12,5-16,25ft-lb - 16,9-22,0nm **AN8** - 22,5-29,0ft-lb - 30,5-39,0nm **AN10** - 30-36ft-lb - 40,0-48,8nm **AN12** - 38-46ft-lb - 51,5-62,0nm **AN16** - 58-70ft-lb - 78,6-94,9nm **AN20** -71-85ft-lb - 96,2-115nm ![](https://www.speedingparts.com/image/23589/AN-fittings-torque-hose.jpg) **Most people do not use tightening torques when tightening AN fittings, they tighten the connections by hand without torque tools, just like a hose clamp.** - [Hose and Fittings](https://info.speedingparts.eu/hose-and-fittings?hsLang=en) - [Engine](https://info.speedingparts.eu/engine?hsLang=en) - [Fuel System](https://info.speedingparts.eu/fuel-system?hsLang=en) - [Brake system](https://info.speedingparts.eu/brake-system?hsLang=en) - [Chassis](https://info.speedingparts.eu/chassis?hsLang=en) - [Powertrain](https://info.speedingparts.eu/powertrain?hsLang=en) - [Electrical](https://info.speedingparts.eu/electrical?hsLang=en) - [Turbo](https://info.speedingparts.eu/turbo?hsLang=en) [![Speeding\_Logo\_black\_Byline\_pp-2](https://info.speedingparts.eu/hs-fs/hubfs/Speeding_Logo_black_Byline_pp-2.png?width=200&height=60&name=Speeding_Logo_black_Byline_pp-2.png "Speeding_Logo_black_Byline_pp-2")](https://www.speedingparts.eu) Copyright © 2026, Speeding AB