ANSI B61.5 400LB Stainless Steel Slip-on Flange with Neck / SO Flange Applicable for High-pressure Pipelines Customized for Non-standard Requirements

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Nominal Size		Outer Diameter	Central circle diameter	Bolt Hole Diameter	Number of Bolt Holes	Inner Diameter	Flange Ring Height	Weld Groove Diameter	Flange Overall Height	Sealing Face Diameter	Sealing Face Height
DN	NPS	A	J	I		B	C	F	D	G
15	1/2	95.3	66.5	15.7	4	22.4	14.2	38.1	22.4	35.1	6.4
20	3/4	117.3	82.6	19.1	4	27.7	15.7	47.7	25.4	42.9	6.4
25	1	124	88.9	19.1	4	34.5	17.5	53.8	26.9	50.8	6.4
32	1-1/4	133.4	98.6	19.1	4	43.2	20.6	63.5	28.4	63.5	6.4
40	1-1/2	155.4	114.3	22.4	4	49.5	22.4	69.85	31.75	73.15	6.4
50	2	165.1	127	19.1	8	62	25.4	84	36.6	91.9	6.4
65	2-1/2	190.5	149.4	22.4	8	74.7	28.4	100	41.1	104.6	6.4
80	3	209.6	168.1	22.4	8	90.7	31.75	117.3	46	127	6.4
90	3-1/2	228.6	184.2	25.4	8	103.4	35.1	133.3	49.3	139.7	6.4
100	4	254	200.1	25.4	8	116.1	35.1	146	50.8	157.2	6.4
125	5	279.4	234.9	25.4	8	143.8	38.1	177.8	53.8	185.7	6.4
150	6	317.5	269.7	25.4	12	170.7	41.1	206.2	57.15	215.9	6.4
200	8	381	330.2	28.4	12	221.5	47.8	260.3	68.3	269.7	6.4
250	10	444.5	387.3	31.8	16	276.3	53.8	320.5	73.15	323.9	6.4
300	12	520.7	450.8	35.1	16	327.1	57.15	374.6	79.25	381	6.4
350	14	584.2	514.4	35.1	20	359.1	60.05	425.4	84.1	412.8	6.4
400	16	647.7	571.5	38.1	20	410.5	63.5	482.6	93.7	469.9	6.4
450	18	711.2	628.7	38.1	24	461.8	66.55	533.4	98.6	533.4	6.4
500	20	774.7	685.8	41.1	24	513.1	69.85	587.2	101.6	584.2	6.4
600	24	914.4	812.8	47.8	24	616	76.2	701.5	114.3	692.2	6.4

1.Industrial fluid transportation
Low-pressure steam systems (≤400℃)
Circulating water pipelines (inlets and outlets of cooling towers and heat exchangers)
Compressed air pipelines (factory pneumatic systems)

2.Construction and municipal engineering
Firefighting water pipe networks
Heating, ventilation, and air conditioning (HVAC) systems

Structural featuresFeature Description

Connection method Butt welding (Slip-On), double-sided welding inside and outside after the pipeline is inserted into the flange
Inner diameter of the flange Slightly larger than the outer diameter of the pipeline for easy fitting
Sealing surface type Commonly RF (Raised Face) or FF (Flat Face)
Bolt holes Matched with the mating flange, usually even (such as 8 holes, 12 holes)