Selection of standard for special-grade nuts M33 used for HG/T20592 pipe flanges
Thread Content
In Table 3.0.5-2 of HG/T20613-2009 as well as in the tables showing the dimensions of flange structures earlier on, the bolts used for M33 threads are all coarse-threaded. The standard for special-grade nuts is GB/T6175; neither the 2000 version nor the 2016 version of this standard includes the M33 specification, whereas GB/T6176 does include such a specification. When encountering M33 specialty-grade nuts, how should fellow sailors choose the standard?
The standard does have issues; it is recommended to use HG/T20634 instead
The standard is written as HG/T 20634
Take a look at the thread standards; the first series is generally given priority. 36 and 39 can completely replace 33
This relates to the size of the studs used with standard flanges when selecting them; M33 remains constant, and it is the pitch that matters.
Just make the pitch of the stud the same as that of the nut! M33 remains unchanged!