ASME/ANSI B16.5-1996 and B16.47-1996

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

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