ASME B16.5 2013
ASME B16.5 2013
(OP)
Is there some kind of tolerance on diameter of bolt hole. Example on a 4" 150# Flange the dimension given is .750 What would be the +- tolerance. If there is a tolerance, would it be different depending on the size?





RE: ASME B16.5 2013
7.8.1 Bolt Circle Diameter. The required tolerance for all bolt circle diameters is as follows: ±1.5 mm (±0.06 in.)
RE: ASME B16.5 2013
I think the answer is in B16.5:2013 para 7.8.2:
Hope this helps.
RE: ASME B16.5 2013
In answer to the original question - I'm not aware of any tolerance acceptance for diameter of bolt holes.
RE: ASME B16.5 2013
XL8NL Doing the measerement for adjacent bolt holes would be a task to get an accurate measurement using dial calipers, but yes that would be the tolrerance.
HTNeighborsI see your point where B16.5 Table 11-7 points out diameter of bolts.
Considering the diameter of bolts given, would flange be rejectable if diameter of bolt hole is smaller than diameter of bolt?
Again thank you guys
RE: ASME B16.5 2013
RE: ASME B16.5 2013
I give my two cents to the discussion.
I noticed this detail years ago, my opinion is that hole position (bolte circle + hole-to-hole) is important since it is the basis for a good flange alignment, while bolt diameter has only to be large enough to accommodate the bolt with sufficient clearance, as the bolt is expected to carry only axial load. IMHO this is why there is no tolerance on bolt diameter.
Further suggestions?
Stefano