Can the hole on the flange be threaded?
Certainly. One of the flanges is the threaded flange
Sure, bring.Some flanges for special use require threaded thread on some flange holes due to installation and disassembly (such as top wire holes).Of course, flanges in most places are threaded.
The flange bolt hole can tap out the internal thread.But I haven't seen it. There is no flange piece to do so, the direct bolt nut connection is convenient.