ASME B16.5 Loose Flange/Lap Joint Flange Dimensions

Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”. These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.

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 600 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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