ASME B16.5 Class 300 Threaded Flange

Technical Drawing

Dimensions of 300# Threaded Flanges

NPS	D	G	X	K
1/2	95	34.9	38	66.7
3/4	115	42.9	48	82.6
1	125	50.8	54	88.9
1-1/4	135	63.5	64	98.4
1-1/2	155	73.0	70	114.3
2	165	92.1	84	127.0
2-1/2	190	104.8	100	149.2
3	210	127.0	117	168.3
3-1/2	230	139.7	133	184.2
4	255	157.2	146	200.0
5	280	185.7	178	235.0
6	320	215.9	206	269.9
8	380	269.9	260	330.2
10	445	323.8	321	387.4
12	520	381.0	375	450.8
14	585	412.8	425	514.4
16	650	469.9	483	571.5
18	710	533.4	533	628.6
20	775	584.2	587	685.8
22	840	641.4	640	743.0
24	915	692.2	702	812.8

*D: outside diameter of flange; K: diameter of bolt circle; G: outside diameter of raised face; X: diameter of hub at base; For all  threaded flanges of class 300, t (height of raused face)=2mm. All units are mm.

NPS	h	Q	Y	T
1/2	16	23.6	21	12.7
3/4	16	29.0	24	14.3
1	18	35.8	25	15.9
1-1/4	21	44.4	25	17.5
1-1/2	23	50.3	29	19.1
2	29	63.5	32	20.7
2-1/2	32	76.2	37	23.9
3	32	92.2	41	27.0
3-1/2	37	104.9	43	28.6
4	37	117.6	46	30.2
5	43	144.4	49	33.4
6	47	171.4	51	35.0
8	51	222.2	60	39.7
10	56	276.2	65	46.1
12	61	328.6	71	49.3
14	64	360.4	75	52.4
16	69	411.2	81	55.6
18	70	462.0	87	58.8
20	74	512.8	94	62.0
22	…	…	100	65.1
24	83	614.4	105	68.3

*h: minimum thread length; Q:minimum diameter of counterbore; Y: length through hub;  T: minimum thickness of flange; All units are mm.

NPS	n	d	l	L	Mass
1/2	4	5/8	1/2	65	0.64
3/4	4	3/4	5/8	75	1.12
1	4	3/4	5/8	75	1.36
1-1/4	4	3/4	5/8	85	1.68
1-1/2	4	7/8	3/4	90	2.49
2	8	3/4	5/8	90	2.87
2-1/2	8	7/8	3/4	100	4.32
3	8	7/8	3/4	110	5.85
3-1/2	8	7/8	3/4	110	7.34
4	8	7/8	3/4	115	9.61
5	8	7/8	3/4	120	12.3
6	12	7/8	3/4	120	15.6
8	12	1	7/8	140	24.2
10	16	1-1/8	1	160	34.1
12	16	1-1/4	1-1/8	170	49.8
14	20	1-1/4	1-1/8	180	69.9
16	20	1-3/8	1-1/4	190	88.1
18	24	1-3/8	1-1/4	195	109
20	24	1-3/8	1-1/4	205	134
22	24	1-5/8	1-1/2	230	…
24	24	1-5/8	1-1/2	230	201

*n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of stud bolts for 2 mm raised face; Mass: approximate weights/masses of the flange; All units are mm except that d and l are provided in inch, the weights are in kg.

ASME B16.5 Threaded Flange, Classes
150#	300#	400#	600#
900#	1500#	2500#	-

*Click to view the dimensions and weights of threaded flanges of each pressure rating.