ASME B16.5 Lap Joint Flange Dimensions (150lb-2500lb)

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Update time : 2026-04-23 08:44:10

ASME B16.5 Lap Joint Flange

　　Loose flanges, also known as slip-on flanges or mother-and-daughter flanges, are flanges that loosely fit over the flanges of containers or pipes.

　　Loose flange flanges can be manufactured by flanging, direct machining, or welding a ring onto the flange. They can be broadly divided into two types: slip-on flanges with a welding ring and weld neck flanges. Slip-on flanges are used with a matching flange ring, while weld neck flanges are used with a matching flange.

　　Loose flanges are generally used on pipelines. Loosening the bolts allows rotation of the pipes on both sides, and tightening them again facilitates easy assembly and disassembly of the pipeline. Advantages include no additional torque on the container or pipe when the flange deforms, ease of manufacturing, and the ability to use materials different from those of the container or pipe, saving on precious metals. Disadvantages include a larger flange thickness. They are suitable for applications where the container or pipe is lined with brittle materials but the pressure is not high.

ASME B16.5 Lap Joint Flange Dimensions

ASME B16.5 Loose Flange Lap Joint Flange Class 150 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	89	22.9	15.7	4	11.2	15.7	30.2	0.45
3/4″	99	28.2	15.7	4	12.7	15.7	38.1	0.64
1″	108	35.1	15.7	4	14.2	17.5	49.3	0.85
1-1/4″	117	43.7	15.7	4	15.7	20.6	58.7	1.09
1-1/2″	127	50	15.7	4	17.5	22.4	65	1.42
2″	152	62.5	19.1	4	19.1	25.4	77.7	2.17
2-1/2″	178	75.4	19.1	4	22.4	28.4	90.4	3.48
3″	191	91.4	19.1	4	23.9	30.2	108	4.06
3-1/2″	216	104.1	19.1	8	23.9	31.8	122.2	5.05
4″	229	116.8	19.1	8	23.9	33.3	134.9	5.55
5″	254	144.5	22.4	8	23.9	36.6	163.6	6.3
6″	279	171.5	22.4	8	25.4	39.6	192	7.61
8″	343	222.3	22.4	8	28.4	44.5	246.1	12.35
10″	406	277.4	25.4	12	30.2	49.3	304.8	16.8
12″	483	328.2	25.4	12	31.8	55.6	365.3	26.88
14″	533	360.2	28.4	12	35.1	79.25	400.1	39.56
16″	597	411.2	28.4	16	36.6	87.4	457.2	51.87
18″	635	462.3	31.8	16	39.6	96.8	505	56.88
20″	699	514.4	31.8	20	42.9< /td>	103.1	558.8	71.58
24″	813	616	35.1	20	47.8	111.3	663.4	99.44

ASME B16.5 Loose Flange Lap Joint Flange Class 300 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	95	22.9	15.7	4	14.2	22.4	38.1	0.7
3/4″	117	28.2	19.1	4	15.7	25.4	47.8	1.2
1″	124	35.1	19.1	4	17.5	26.9	53.8	1.46
1-1/4″	133	43.7	19.1	4	19.1	26.9	63.5	1.79
1-1/2″	155	50	22.4	4	20.6	30.2	69.9	2.62
2″	165	62.5	19.1	8	22.1	33.3	84.1	3
2-1/2″	191	75.4	22.4	8	25.4	38.1	100.1	4.53
3″	210	91.4	22.4	8	28.4	42.9	117.3	6.04
3-1/2″	229	104.1	22.4	8	30.2	44.5	133.4	7.61
4″	254	116.8	22.4	8	31.8	47.8	146.1	9.95
5″	279	144.5	22.4	8	35.1	50.8	177.8	12.5
6″	318	171.5	22.4	12	36.6	52.3	206.2	16.09
8″	381	222.3	25.4	12	41.1	62	260.4	24.67
10″	445	277.4	28.4	16	47.8	95.3	320.5	39.42
12″	521	328.2	31.8	16	50.8	101.6	374.7	56.45
14″	584	360.2	31.8	20	53.8	111.3	425.5	81.57
16″	648	411.2	35.1	20	57.2	120.7	482.6	104.75
18″	711	462.3	35.1	24	60.5	130	533.4	128.15
20″	775	514.4	35.1	24	63.5	139.7	587.2	157.65
24″	914	616	41.1	24	69.9	152.4	701.5	236.32

ASME B16.5 Loose Flange Lap Joint Flange Class 400 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	95.3	22.9	15.7	4	14.2	22.4	38.1	0.71
3/4″	117.3	28.2	19.1	4	15.7	25.4	47.8	1.2
1″	124	35.1	19.1	4	17.5	26.9	53.8	1.46
1-1/4″	133.4	43.7	19.1	4	20.6	28.4	63.5	1.93
1-1/2″	155.4	50	22.4	4	22.4	31.75	69.85	2.85
2″	165.1	62.5	19.1	8	25.4	36.6	84.1	3.42
2-1/2″	190.5	75.4	22.4	8	28.4	41.1	100.1	5
3″	209.6	91.4	22.4	8	31.75	46	117.3	6.65
3-1/2″	228.6	104.1	25.4	8	35.1	49.3	133.4	8.46
4″	254	116.8	25.4	8	35.1	50.8	146.1	10.64
5″	279.4	144.5	25.4	8	38.1	53.8	177.8	13.26
6″	317.5	171.5	25.4	12	41.1	57.15	206.2	17.43
8″	381	222.3	28.4	12	47.8	68.3	260.4	27.69
10″	444.5	277.4	31.75	16	53.8	101.6	320.5	42.26
12″	520.7	328.2	35.1	16	57.15	108	374.7	60.88
14″	584.2	360.2	35.1	20	60.45	117.3	425.5	87.64
16″	647.7	411.2	38.1	20	63.5	127	482.6	111.66
18″	711.2	462.3	38.1	24	66.55	136.7	533.4	136.17
20″	774.7	514.4	41.1	24	69.85	146.1	587.2	164.75
24″	914.4	616	47.8	24	76.2	158.8	701.5	246.15

ASME B16.5 Loose Flange Lap Joint Flange Class 600 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	95	22.9	15.7	4	14.2	22.4	38.1	0.7
3/4″	117	28.2	19.1	4	15.7	25.4	47.8	1.2
1″	124	35.1	19.1	4	17.5	26.9	53.8	1.46
1-1/4″	133	43.7	19.1	4	20.6	28.4	63.5	1.92
1-1/2″	155	50	22.4	4	22.4	31.8	69.9	2.83
2″	165	62.5	19.1	8	25.4	36.6	84.1	3.41
2-1/2″	191	75.4	22.4	8	28.4	41.1	100.1	5.03
3″	210	91.4	22.4	8	31.8	46	117.3	6.69
3-1/2″	229	104.1	25.4	8	35.1	49.3	133.4	8.5
4″	273	116.8	25.4	8	38.1	53.8	152.4	14.02
5″	330	144.5	28.4	8	44.5	60.5	189	23.84
6″	356	171.5	28.4	12	47.8	66.5	222.3	28.14
8″	419	222.3	31.8	12	55.6	76.2	273.1	42.28
10″	508	277.4	35.1	16	63.5	111.3	342.9	75.16
12″	559	328.2	35.1	20	66.5	117.3	400.1	90.25
14″	603	360.2	38.1	20	69.9	127	431.8	108.24
16″	686	411.2	41.1	20	76.2	139.7	495.3	155.63
18″	743	462.3	44.5	20	82.6	152.4	546.1	188.49
20″	813	514.4	44.5	24	88.9	165.1	609.6	241.47
24″	940	616	50.8	24	101.6	184.2	717.6	346

ASME B16.5 Loose Flange Lap Joint Flange Class 900 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	120.6	22.9	22.3	4	22.3	31.7	38.1	1.71
3/4″	130	28.2	22.3	4	25.4	35	44.4	2.28
1″	149.3	35.1	25.4	4	28.4	41.1	52.3	3.35
1-1/4″	158.7	43.7	25.4	4	28.4	41.1	63.5	3.79
1-1/2″	177.8	50	28.4	4	31.7	44.4	69.85	5.25
2″	215.9	62.5	25.4	8	38.1	57.15	104.6	9.65
2-1/2″	244.3	75.4	28.4	8	41.1	63.5	123.9	13.38
3″	241.3	91.4	25.4	8	38.1	53.8	127	11.26
4″	292.1	116.8	31.7	8	44.4	69.85	158.7	19.23
5″	349.2	144.5	35	8	50.8	79.25	190.5	31.29
6″	381	171.5	31.7	12	55.6	85.8	234.9	40.34
8″	469.9	222.3	38.1	12	63.5	114.3	298.4	72.69
10″	546.1	277.4	38.1	16	69.85	127	368.3	105.97
12″	609.6	328.2	38.1	20	79.25	142.7	419.1	141.33
14″	641.3	360.2	41.1	20	85.8	155.4	450.8	162.58
16″	704.8	411.2	44.4	20	88.9	165.1	508	199.78
18″	787.4	462.3	50.8	20	101.6	190.5	565.1	280.05
20″	857.2	514.4	53.8	20	107.9	209.5	622.3	351.11
24″	1041.4	616	66.55	20	139.7	266.7	749.3	673.48

ASME B16.5 Loose Flange Lap Joint Flange Class 1500 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	120.6	22.9	22.3	4	22.3	31.7	38.1	1.71
3/4″	130	28.2	22.3	4	25.4	35	44.4	2.28
1″	149.3	35.1	25.4	4	28.4	41.1	52.3	3.35
1-1/4″	158.7	43.7	25.4	4	28.4	41.1	63.5	3.79
1-1/2″	177.8	50	28.4	4	31.7	44.4	69.85	5.25
2″	215.9	62.5	25.4	8	38.1	57.15	104.6	9.65
2-1/2″	244.3	75.4	28.4	8	41.1	63.5	123.9	13.38
3″	266.7	91.4	31.7	8	47.7	73.15	133.3	17.57
4″	311.1	116.8	35	8	53.8	90.4	162	27.17
5″	374.6	144.5	41.1	8	73.15	104.6	196.8	51.24
6″	399.7	171.5	38.1	12	82.5	119.1	228.6	62.6
8″	482.6	222.3	44.4	12	91.9	142.7	292.1	101.8
10″	584.2	277.4	50.8	12	107.9	177.8	368.3	180.54
12″	673.1	328.2	53.8	16	123.9	218.9	450.8	284.37
14″	749.3	360.2	60.45	16	133.3	241.3	495.3	383.7
16″	825.5	411.2	66.55	16	146	260.3	552.4	493.3
18″	914.4	462.3	73.15	16	162	276.3	596.9	636.61
20″	984.2	514.4	79.25	16	177.8	292.1	641.3	764.97
24″	1168.4	616	91.9	16	203.2	330.2	762	1223.13

ASME B16.5 Loose Flange Lap Joint Flange Class 2500 LBS Dimensions

NPS	A	B	I	Holes	C	D	F	Weight
1/2″	133.4	22.9	22.4	4	30.2	39.6	42.9	2.92
3/4″	139.7	28.2	22.4	4	31.75	42.9	50.8	3.39
1″	158.8	35.1	25.4	4	35.1	47.8	57.15	4.79
1-1/4″	184.2	43.7	28.4	4	38.1	52.3	73.15	7.06

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ASME B16.5 Lap Joint Flange Dimensions (150lb-2500lb)