Hello Wolfgang,
if you look closely under the column "S" it states "Firing End Construction", the fixed terminal nut is on the other end.
Since this NGK nomenclature is so confusing I inquired with the NGK Technical Support-USA why some BP5ES have a removable terminal and on others it is fixed. Here the reply:
"Thank you for your inquiry.
There are different terminal types for spark plugs. We no longer offer BP5ES in a loose design, the type where you can unscrew the tip, so the solid terminal type is normal for this plug. The loose design has superseded to the solid terminal type, stock number 7832 to stock number 2140.
Please let me know if you have any additional questions."
I followed up by asking whether there is a decoder that would tell us which stock number for other plugs has the removable terminal nut but received no further replies.
Thus anyone searching for the correct BP5ES look for stock number 7832. Or perhaps for stock number 6511 as Paul noted earlier.
And if you search for BP6ES then find stock number 7333 and DO NOT buy the new stock number 7811, it has a fixed terminal.
Given that confusing state of part numbers it will be best to ask specifically whether the plug has a removable terminal nut.