Re: stainless steel bolts

On Fri, 08 Nov 2024 10:54:34 -0600, Jim Joyce wrote:

I never thought of looking at the head of the bolt, which does have soem
"secret code" written on it as you can see in the photo of the head here.
https://i.postimg.cc/t4NwLb2V/qj4-8-bolts.jpg
>
What do those strange markings mean to you? "Q J 4.8."

 400Mpa nominal tensile slrength with 80% yeild - msfium carbon
steel. no idea what the QJ stans for

 In some other contexts, I've seen it stand for Quanjiangcun, a manufacturing
district in China. Not sure if that applies here. Probably not.

QJ shows up in places but it's never explained what it means when it does.
BOLT 5131014179 QJ 4.8
https://www.mowermagic.co.uk/acatalog/BOLT---5131014179---QJ-4.8-5131014179.html
Stainless Steel Hex Head Bolts QJ 2394
https://www.ss-bolt.com/sale-30872879-stainless-steel-hex-head-bolts-qj-2394-1992-stainless-steel-304-m2-m12-hexagon-head-nuts.html
The word is associated in other links to "Quick Joint" though.
But I can't pin it to these bolts on my own but only to joints.
1 1/2" Guardian Quick Joint QJ Stainless Steel Compression Fitting
https://www.ebay.com/itm/335193829655
Quick coupling fittings for tank - Quick Joints QJ
https://www.bucchi.it/en/prodotti/m04-soluzioni-tecniche-innovative/c08-raccordi-rapidi-ad-innesto-per-serbatoio-quick-joints-qj