Issue with bolt material code
Thread Content
After leaving the factory, the bolts have the letters J2 and J5 marked on their ends; these seem to indicate carbon steel and alloy steel respectively. My question is: are these codes factory-specific markings? Are there any other codes? I searched online, but unfortunately found nothing. I would appreciate it if you could give me some advice; ideally, I need more comprehensive information: handshake
It generally refers to the material; information related to materials such as B7 can be found in the relevant material manuals!
You can ask the supplier what the symbols mean.