ASME B16.5 Welding Neck Flange Class 400

Technical Drawing

Dimensions and Weights

Size	D	T	G	t
1/2"	95	14.3	34.9	7.0
3/4"	115	15.9	42.9	7.0
1"	125	17.5	50.8	7.0
1-1/4"	135	20.7	63.5	7.0
1-1/2"	155	22.3	73.0	7.0
2"	165	25.4	92.1	7.0
2-1/2"	190	28.6	104.8	7.0
3"	210	31.8	127.0	7.0
3-1/2"	230	35.0	139.7	7.0
4"	255	35.0	157.2	7.0
5"	280	38.1	185.7	7.0
6"	320	41.3	215.9	7.0
8"	380	47.7	269.9	7.0
10"	445	54.0	323.8	7.0
12"	520	57.2	381.0	7.0
14"	585	60.4	412.8	7.0
16"	650	63.5	469.9	7.0
18"	710	66.7	533.4	7.0
20"	775	69.9	584.2	7.0
22"	840	73.1	641.4	7.0
24"	915	76.2	692.2	7.0

*The dimensions of outside diameter, flange thickness, and raised face of ASME B16.5 Class 400 welding neck flange. D: outside diameter of flange; T: flange thickness; t: height of raised face; G: outside diameter of raised face; all units are mm.

Size	K	n	d	l	L
1/2"	66.7	4	5/8	1/2	75
3/4"	82.6	4	3/4	5/8	90
1"	88.9	4	3/4	5/8	90
1-1/4"	98.4	4	3/4	5/8	95
1-1/2"	114.3	4	7/8	3/4	110
2"	127.0	8	3/4	5/8	110
2-1/2"	149.2	8	7/8	3/4	120
3"	168.3	8	7/8	3/4	125
3-1/2"	184.2	8	1	7/8	140
4"	200.0	8	1	7/8	140
5"	235.0	8	1	7/8	145
6"	269.9	12	1	7/8	150
8"	330.0	12	1-1/8	1	170
10"	387.4	16	1-1/4	1-1/8	190
12"	450.8	16	1-3/8	1-1/4	205
14"	514.4	20	1-3/8	1-1/4	210
16"	571.5	20	1-1/2	1-3/8	220
18"	628.6	24	1-1/2	1-3/8	230
20"	685.8	24	1-5/8	1-1/2	240
22"	743.0	24	1-3/4	1-5/8	255
24"	812.8	24	1-7/8	1-3/4	265

*The bolting dimensions of ASME B16.5 Class 400 welding neck flange. K: diameter of bolt circle; n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of stud bolts for 7 mm raised face flange; the length of the stud bolt does not include the height of the points. All units are mm except that d and l are provided in inch.

Size	Y	X	A	Ms
1/2"	52	38	21.3	0.87
3/4"	57	48	26.7	1.45
1"	62	54	33.4	1.76
1-1/4"	67	64	42.2	2.49
1-1/2"	70	70	48.3	3.49
2"	73	84	60.3	4.36
2-1/2"	79	100	73.0	6.43
3"	83	117	88.9	8.53
3-1/2"	86	133	101.6	10.7
4"	89	146	114.3	12.8
5"	102	178	141.3	16.9
6"	103	206	168.3	22.0
8"	117	260	219.1	34.7
10"	124	321	273.0	48.5
12"	137	375	323.8	69.6
14"	149	425	355.6	95.5
16"	152	483	406.4	118
18"	165	533	457.0	145
20"	168	587	508.0	173
22"	171	640	22.0	189.24
24"	175	702	610.0	249

*The dimensions of hub and weights for ASME B16.5 Class 400 welding neck flange. Y: length through hub; X: diameter of hub at base; A: diameter of hub at top welding point; Ms: approximate weights/ masses of the flange; Generally, the bore diameter B of flange is equal to A minus two times of nominal wall thickness of adjoining pipe. All dimensions are in mm and the weights are in kg.

ASME B16.5 WN Flanges: Dimensions & Weights
Class150	Class 300	Class 400	Class 600
Class 900	Class 1500	Class 2500	-

*Click to view the dimensions and weights for other pressure ratings.