The first floor is nonsense.

If it is a national standard product, and 8.8 is mounted on the bolt head.

8.8? and? HDW should be separated .

This is the national standard marking method.

8.8 refers to the standard 6-angle head bolt of 8.8. There is also a situation where 8.8H refers to the 8.8-level large bolt. 6-angle head bolts.

And HDW is just the name of the manufacturer. HDW may be produced by Hardiway. A manufacturer.

I will give you a screenshot later: for steel structures Technical conditions for high-strength large hexagonal bolts, large hexagonal nuts, and washers (GB-T1231-2006)?

The manufacturer is called Hardiway. But it seems that there are many companies called Hardiway. Fasteners. There are some from Shanghai and Dalian. It seems that Dalian’s Hardiwe uses HDW as its trademark, with HD on top and W on the bottom. I hope it helps.

If it doesn’t work, you can Google it yourself. ?HaDeWe? (combined? Shanghai or Dalian and other place names) find the webpage and call to ask.

The connection is Dalian HadiWe.