mallory yc set up
SAE flare tube nut sizes vs tube size
The wonderful world of flared fittings… commonly overlooked is the proper terminology, or the existence of the actual sizes. Its similar to bolts a 3/8 bolt has a 9/16 head. Think about it in the same way. If you ask for a 9/16 bolt you are going to get a bolt with a 13/16 head !!! if you ask for the 3/8 bolt you actually need it will have a 9/16 head and wont look like a cartoon sized piece of hardware. Hope this was some good info and now you can tell your buddy it’s actually a ½-20tube nut not a 5/16! -Rick
Tube nut Sizes
1/8 tube = 5/16-28
3/16 tube = 3/8-24
¼ tube =7/16-24
5/16 tube = ½-20
3/8 tube = 5/8-18
7/16 tube = 11/16-18