Flare nut wrench sizes

[bw77]

I was looking at some sets of metric flare nut wrenches, and I noticed that some of them do not include the 16x18mm size, others do. Same for the 19x21 size. What applications would use those sizes?

Wright 5 piece set - 16x18 not included

Proto - 5 piece set, no 16x18, no 19x21

Snap-on - 6 piece set includes both, 5 piece set no 16x18

Gearwrench - 6 piece set includes both

HF - 5 piece set, no 16x18, no 21

SK - 6 piece set includes both

Cman - 5 piece full polish set includes 16x18, but no 19x21

Cman - raised panel 4 piece set, no 16x18, no 19x21

 

[warmpancakes]

16 and 18 is GM power steering lines

 

[Chris_R/T]

16 and 18 is GM power steering lines

Took the words right outta my mouth! That's probably the only application I've had a use for them other than an 18mm on 5.0 Explorer/Mountaineer power steering lines.

 

[warmpancakes]

i use mine weekly for GM s-series steering box swaps

 

[Theloniousmonk]

Mercedes w124 series lines too.

 

[Black89LX]

cman raised panel have the 19x21... but the sae set doesnt have 1/4x5/16... thats why i returned it and got the full polish sets, then i ordered the individual 19x21... all for 30 bucks more than i paid for the raised panel set

 

[scottmlew]

I was looking at some sets of metric flare nut wrenches, and I noticed that some of them do not include the 16x18mm size, others do. Same for the 19x21 size. What applications would use those sizes?

I can assure you of this -- if you do NOT get the 16, 18, 19, and 21 mm sizes, EVERY application you encounter will use those sizes

 

[wantedabiggergarage]

I believe GM fuel filters use 16 and 20mm wrenches.

 

[wafrederick]

20mm does fit GM fuel filters and Cornwell does sell a 20mm flare nut wrench for this application.Ford and Chrysler also use 18mm on power steering lines.There is some reason why tool companies leave out 18mm including 15mm.