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From: Harry S Robins <stanleyrobins@nothere.uk>
Newsgroups: alt.home.repair,rec.autos.tech
Subject: Re: stainless steel bolts
Date: Fri, 8 Nov 2024 13:54:33 -0600
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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