What size of bolts for flange 150 class 1" size? 4

[PatKop]

I have to check what kind of bolts size should be on the flange 150 class and 1" size - (ANSI16.5) 150LB (PN20) 1"NB (DN25)?
On the web I have found many specifications but unfortunately they are different. Some of them shows bolts size 1/2" and some of them shows 5/8"... I'm confiused.


Thanks in advance for help
PatKop

 

[ijzer]

Per ASME B16.5 the bolts are 1/2". The 5/8" you have seen is the bolthole dia.

 

[Shmulik]

ASME B16.5 Table 8 – Templates for Drilling Class 150 Flanges:
NPS 1"
OD of Flange: 4.25"
Dia. of Bolt Circle: 3.12"
Dia. of Bolt Hole: 0.62"
Number of Bolts: 4
Diameter of Bolts: 1/2"

Its somehow difficult inserting 5/8" (0.625") bolt into 0.62" hole……

 

[PatKop]

Thanks a lot for help&info

PatKop