I have a set of Craftsman flare nut wrenches (also called "line wrenches") that have never worked very well on any fitting that was difficult, which is most of them. I'm not sure if it is poor fit from being just a bit too large or if the wrench spreads a bit under load. Either way they are best at rounding off the corners on flare fitting nuts. They have given me good experience working with vice grips on tube nuts. Normally I have found Craftsman wrenches to be more than adequate for my needs, but not these.

My question: What brand of flare nut wrenches have you found work well, including on rusted flare nuts (especially brake lines)? Do you have any other tricks for getting these nuts off in a reuseable condition? Looking under my driven in Wisconsin salt '93 F-250 I know I'm gonna be dealing with this problem again.

TIA
MIDLF

 

I have the same set of craftsman wrenches in my box at home and have the same experience with them. The jaws are spreading. Try clamping your vicegrips on over the wrench & that usually works. Professionally I use only snap on because they are one of the few that will not spread, especially the crowfoot flarenut wrenches. (i like the looks of the S-K ones too but have not tried them)Try e-bay....1/2 price

 

Same with my Craftsman line wrenches, the jaws spread, absolute junk. Try SK wrenches, but I have not tried them yet.

 

snap on flare wrenchs are the best out there. I use them profesionally nothing else even comes close.

 

I'll second that statement.

 

I found the best thing to use on flare nuts is a good quality adjustable wrench set. When you buy the wrenches you need to take a bolt or nut with you, and see if the wrench grips four out of the six sides. Some do, but most don't. My craftsmen do, but the smaller sizes are too thin. The older Kleins were the best, but the new pink handled ones only grip two sides. I worked for a company that did commercial fuel oil service, if they caught you using vise grips or pliers on a flare nut they would suspend you the first two times, the third time they'd fire you.

 

Same hear, I did a couple brakelines a few years ago, so I bought the crapsmans. It was like $18 for 4 wrenches. Car Quest had a set for around $60, they were highly polished, and the guy said they were made buy Snap-on. Snap-on are like $150, Arn't they? I contimplated it for a while, but for the once in 5 - 10 years I would use 'em I went with the cheap crap. They slip at 5 lbs of torque. I borrowed a Snap-on and was blown away you can't make 'em slip. I started giggling like a kid when I saw how well they worked. The crapsmans are still in the tool box, but next time I need 'em, I going to throw 'em away get some real tools.

 

Glad I read this thread, I was thinking about buying some of those Crapsman FN wrenches...

They look great for the money but are useless if they don't work.

 

I had no idea that flarenut wrenches were suppose to actually work. I bought a set of 4 from Carquest years ago. Only the wrenches themselves flare. If a box wrench and PB blaster won't get it; I cut it and use a socket or visegrips.

 

I usualy cut the lines off and use a socket. I work in a small shop and im still in high school and mainly use craftsman because my wallet isnt deep enough to jump on the snap on truck (yet) so when ever the line must be saved I just borrow my bosses snap ons. Also I mostly work on GMs and their fittings seem to be pretty soft and rust doesnt help also try the straight jaw vice grip trick by squezing the flats of the fitting to help loosen it

 

I guess I'll be on the truck for a real set of wrenches! And I just paid off my
snap-on tab (Oh well)
Thanks for the post I would have tried crapsman first too....................
JC.

 

The problem about using vise grips or pliers on the flare nut is its hollow, and you will egg it and the fitting. Then it will leak when the fluid is a different temperature than the nut.

 

I certainly agree about the Craftsman or any other cheap flare wrench. My faves are Proto, they work well and have a standard open end on the other. As good as any I have used.

 

I wish... try $339 for a set of 10 metric FN/Open end wrenches... or $197 for a 6 pc Dbl end metric set... (from Snapon.com) Mac: $191 for 6 pc Dbl end metric set; Matco: $187... <GULP>

S-K are a lot cheaper... about $51 from thetoolwarehouse.com.... anyone have any experience with these?

Proto prices aren't bad either: about $72 for a 5 pc metric set from Gainger.

Check out this Facom contraption on Griot's: http://www.griotsgarage.com/catalog.jsp?&SKU=FK290

 

I have a set of Craftsman and they work very well. What I have found is the nuts are bad and any wrench will round them off!