Common sense is required when using the -3 fittings. No putting them in with the 1/2 drive breaker bar and 2 foot piece of pipe! That said any non ham-fisted person can use them. If you regularly strip 1/2-13 bolts then use a torque wrench!
WRJJRS@aol.com wrote:
> For general info group, I have used the -3 aluminum fittings and found > them more than strong enough. A getoff that broke the caliper on a > guard rail didn't fail the fitting. While that isn't total surity it > does show that the fittings are tough. I used the Earl's fittings > then. I wouldn't hesitate to use them on the aircraft.
> > Bill Jepson
Thanks, Bill. I'm gonna order the -3D fittings throughout ('cause my head hurts trying to keep all the permutations of different sizes correct 8*). I was worried about the strength because I've had some -3 bolts break on me when trying to put nylock nuts on.
For the fuel lines, I'm going with the -6D (3/8) from tank to firewall.
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