ASME/ANSI B16.5-1996 and B16.47-1996
Tolerances on flange dimensions (ASME/ANSI B16.5 and B16.7, and MSS SP-44)
Dimension
Range
Tolerance
in
mm
General and Blind Flanges(For blind flange dimendions see page 8-23 for B16.5, page8-46 for B16.47 Series A/ MSS SP-44 and page 8-51 for B16.47 Series B/ API 605):
G(raised face diameter)
≤NPS 24
±0.03
±0.76
≥NPS 26,with 0.06 in raised face
±0.08
±2.03
≥NPS 26,with 0.25 in raised face
±0.04
±1.02
I(bolt hole diameter)
All
No tolerance in B16.5 or B 16.47
J(bolt circle diameter)
All
±0.06
±1.52
Center to center of adjacent bolt holes
All
±0.03
±0.76
Eccenticity of bolt circle and machined facing diameters
≤NPS 2½
±0.03
±0.76
≥NPS 3
±0.06
±1.52
Weld Neck Flanges1 (For dimensions see page 8-10 for B 16.5, page 8-46 for B16.47 Series A/ MSS SP-44 and page 8-51 for B16.47 Series B/ API 605):
D(overall length)
≤NPS 4
﹢0.06
﹢1.52
NPS 5 to 10
﹢0.06,﹣0.12
﹢1.52,﹣3.05
NPS 12 to 24
﹢0.12,﹣0.18
﹢3.05,﹣4.57
≥NPS 26
±0.19
±4.83
Thickness of hub
All
>87.5% of pipe nominal wall thickness
Slip on(see page 8-17),Lap Joint(see page8-32) and Socket Welding(see page 8-30 for dimensions) Flanges:
B(inside diameter,or bore)
≤NPS10
﹢0.03,﹣0.0
﹢0.76,﹣0.0
≥NPS12
﹢0.06,﹣0.0
﹢1.52,﹣0.0
Threaded Flanges (see page 8-40 for dimensions):
B(counterbore) (Not applicable for Class 150 lb
≤NPS10
﹢0.03,﹣0.0
﹢0.76,﹣0.0
≥NPS12
﹢0.06,﹣0.0
﹢1.52,﹣0.0
Comments