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14mm is very close to 9/16, which is 3/8-16 thread. Sometimes you can use the wrenches interchangeably, sometimes not.
How are you determining it is 14mm?
If you are measuring 14mm, your bolt head could be worn/damaged, or just plain out of tolerance from whoever made it.
Yes 14mm and 9/16ths are very close. And 9/16ths is correct. And yes thread size is indeed 3/8th's-16. Me, I use allen head bolts as they look tidy. With the little push on caps. Looks tidy and keeps junk out of the allen head.
The 9/16 had a bunch of slop in it. The 14mm fit it perfect. I guess with only .28mm difference they might both fit. Just seemed wrong. I'm planning to change to a different bolt for better looks. There is a cover on one and not on the other. Not sure when it fell off.
This thread reminds me of this when I was teenager growing up in Brooklyn, NY. It's a bit amusing. Replacing the motor mounts on my 340 Dodge Dart I needed some new hardware. So I took a trip to a hardware store a few blocks away from Luna Park. I go into the store and asked the clerk for some 7/16" bolts. He than ask me "now when you say 7/16" do you mean the size of the wrench you're using or the size of the bolt". I replied "size of the bolt". He replied back to me "I only asked because the guys that were just in here thought the size of a bolt is the size of the wrench you use". He went on to say "yeah, they're putting new Wheels on the Cyclone" as he was pointing his thumb towards the rollercoaster.
Last edited by Fly skids up!; Dec 29, 2021 at 06:16 PM.
bolt heads rust too. and corrode away and are smaller than they were when new. 14 mil is a necessity to work on old 9/16ths bolt heads. and hammering a 12 onto a corroded 1/2 is gonna happen too. alao, car makers went metric. they mostly did so at first by putting metric heads on 3/8 and 5/16ths bolts. and called them 9 and 8 point whatever thread size. so you could find 3/8ths-16 bolts with 14 mm heads.
make my own out of SS rod.
