ASME B16.5 Welding Neck Flange Class 300

Technical Drawing

Dimensions and Weights

Size	D	T	G	t
1/2"	95	12.7	34.9	2.0
3/4"	115	14.3	42.9	2.0
1"	125	15.9	50.8	2.0
1-1/4"	135	17.5	63.5	2.0
1-1/2"	155	19.1	73.0	2.0
2"	165	20.7	92.1	2.0
2-1/2"	190	23.9	104.8	2.0
3"	210	27.0	127.0	2.0
3-1/2"	230	28.6	139.7	2.0
4"	255	30.2	157.2	2.0
5"	280	33.4	185.7	2.0
6"	320	35.0	215.9	2.0
8"	380	39.7	269.9	2.0
10"	445	46.1	323.8	2.0
12"	520	49.3	381.0	2.0
14"	585	52.4	412.8	2.0
16"	650	55.6	469.9	2.0
18"	710	58.8	533.4	2.0
20"	775	62.0	584.2	2.0
22"	840	65.1	641.4	2.0
24"	915	68.3	692.2	2.0

*The dimensions of outside diameter, flange thickness, and raised face of ASME B16.5 Class 300 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	65
3/4"	82.6	4	3/4	5/8	75
1"	88.9	4	3/4	5/8	75
1-1/4"	98.4	4	3/4	5/8	85
1-1/2"	114.3	4	7/8	3/4	90
2"	127.0	8	3/4	5/8	90
2-1/2"	149.2	8	7/8	3/4	100
3"	168.3	8	7/8	3/4	110
3-1/2"	184.2	8	7/8	3/4	110
4"	200.0	8	7/8	3/4	115
5"	235.0	8	7/8	3/4	120
6"	269.9	12	7/8	3/4	120
8"	330.2	12	1	7/8	140
10"	387.4	16	1-1/8	1	160
12"	450.8	16	1-1/4	1-1/8	170
14"	514.4	20	1-1/4	1-1/8	180
16"	571.5	20	1-3/8	1-1/4	190
18"	628.6	24	1-3/8	1-1/4	195
20"	685.8	24	1-3/8	1-1/4	205
22"	743.0	24	1-5/8	1-1/2	230
24"	812.8	24	1-5/8	1-1/2	230

*The bolting dimensions of ASME B16.5 Class 300 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 2 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"	51	38	21.3	0.75
3/4"	56	48	26.7	1.26
1"	60	54	33.4	1.52
1-1/4"	64	64	42.2	2.03
1-1/2"	67	70	48.3	2.89
2"	68	84	60.3	3.40
2-1/2"	75	100	73.0	5.17
3"	78	117	88.9	6.93
3-1/2"	79	133	101.6	8.67
4"	84	146	114.3	11.2
5"	97	178	141.3	15.1
6"	97	206	168.3	19.1
8"	110	260	219.1	29.9
10"	116	321	273.0	42.7
12"	129	375	323.8	61.8
14"	141	425	355.6	85.8
16"	144	483	406.4	106
18"	157	533	457.0	131
20"	160	587	508.0	158
22"	164	640	558.8	174.8
24"	167	702	610.0	230

*The dimensions of hub and weights for ASME B16.5 Class 300 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.