B16.47 Series A Class 150 Dimensions

Flange outside diameter, thickness, bolt circle and bolting for NPS 26 through NPS 60, ASME B16.47 Series A Class 150.

Standard: ASME B16.47
Series: Series A
Class: Class 150
Sizes: NPS 26 – NPS 60
Largest flange OD: 73.00 in (1854.2 mm)

Dimensions are given in inches, with the millimetre equivalent beneath in grey.

ASME B16.47 Series A Class 150 flange dimensions.
Size	Flange OD	Thickness	Bolt circle	Bolts	Bolt dia.
NPS 26	34.25869.95 mm	1.9449.28 mm	31.75806.45 mm	24	1 1/4 in
NPS 28	36.50927.10 mm	2.0652.32 mm	34.00863.60 mm	28	1 1/4 in
NPS 30	38.75984.25 mm	2.1253.85 mm	36.00914.40 mm	28	1 1/4 in
NPS 32	41.751060.45 mm	2.2557.15 mm	38.50977.90 mm	28	1 1/2 in
NPS 34	43.751111.25 mm	2.3158.67 mm	40.501028.70 mm	32	1 1/2 in
NPS 36	46.001168.40 mm	2.3860.45 mm	42.751085.85 mm	32	1 1/2 in
NPS 38	48.751238.25 mm	2.5063.50 mm	45.251149.35 mm	32	1 1/2 in
NPS 40	50.751289.05 mm	2.5665.02 mm	47.251200.15 mm	36	1 1/2 in
NPS 42	53.001346.20 mm	2.6266.55 mm	49.501257.30 mm	36	1 1/2 in
NPS 44	55.251403.35 mm	2.6968.33 mm	51.751314.45 mm	40	1 1/2 in
NPS 46	57.251454.15 mm	2.7569.85 mm	53.751365.25 mm	40	1 1/2 in
NPS 48	59.501511.30 mm	2.8171.37 mm	56.001422.40 mm	44	1 1/2 in
NPS 50	61.751568.45 mm	2.8873.15 mm	58.251479.55 mm	44	1 1/2 in
NPS 52	64.001625.60 mm	2.9474.68 mm	60.501536.70 mm	44	1 5/8 in
NPS 54	66.251682.75 mm	3.0076.20 mm	62.751593.85 mm	44	1 5/8 in
NPS 56	68.751746.25 mm	3.1279.25 mm	65.001651.00 mm	48	1 5/8 in
NPS 58	71.001803.40 mm	3.1981.03 mm	67.251708.15 mm	48	1 5/8 in
NPS 60	73.001854.20 mm	3.2582.55 mm	69.251758.95 mm	52	1 5/8 in

Thickness is the minimum required by the standard and excludes the raised face.

Common questions

How many bolts does an NPS 36 Series A Class 150 flange take?

32 bolts of 1 1/2 in diameter, on a 42.75 in (1085.8 mm) bolt circle.

Are these dimensions the same as Series B?

No. Series A and Series B differ in outside diameter, bolt circle and bolt count at every size. The two will not bolt together, and a gasket for one will not suit the other.