ASME B16.5 - Flange Dimensions Data

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Flange dimensions are covered in the following tables of ASME B16.5 2020:

Table 8, 8C
Table 11, 11C
Table 14, 14C
Table 16, 16C
Table 18, 18C
Table 20, 20C
Table 22, 22C

Dimensions are provided for threaded, slip-on, socket welding, weld neck, lap joint, and blind flanges, though data is not available for all types at all classes and NPS sizes.

Tables

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Some dimensions data is available in the tables below.

For full dimensions data, download the Flange Bolt Chart app.

Get full dimensions data.

Download Flange Bolt Chart.

Screenshot of the Flange Bolt Chart app showing flange dimensions for weld neck flange.

Dimensions of Class 150 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	89	9.7	30
0.75	99	11.2	38
1	108	12.7	49
1.25	117	14.2	59
1.5	127	15.9	65
2	152	17.5	78
2.5	178	20.6	90
3	190	22.4	108
3.5	216	22.4	122
4	229	22.4	135
5	254	22.4	164
6	279	23.9	192
8	343	26.9	246
10	406	28.4	305
12	483	30.2	365
14	553	33.3	400
16	597	35.1	457
18	635	38.1	505
20	698	41.1	559
22	749	44.4	610
24	813	46	663

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 150 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	3.5	0.38	1.19
0.75	3.88	0.44	1.5
1	4.25	0.5	1.94
1.25	4.62	0.56	2.31
1.5	5	0.62	2.56
2	6	0.69	3.06
2.5	7	0.81	3.56
3	7.5	0.88	4.25
3.5	8.5	0.88	4.81
4	9	0.88	5.31
5	10	0.88	6.44
6	11	0.94	7.56
8	13.5	1.06	9.69
10	16	1.12	12
12	19	1.19	14.38
14	21	1.31	15.75
16	23.5	1.38	18
18	25	1.5	19.88
20	27.5	1.62	22
22	29.5	1.75	24
24	32	1.81	26.12

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 300 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	95	12.7	38
0.75	117	14.2	48
1	124	15.7	54
1.25	133	17.5	64
1.5	155	19	70
2	165	20.6	84
2.5	190	23.9	100
3	210	26.9	117
3.5	229	28.4	133
4	254	30.2	146
5	279	33.3	178
6	318	35.1	206
8	381	39.6	260
10	444	46	321
12	521	49.3	375
14	584	52.3	425
16	648	55.6	483
18	711	58.7	533
20	775	62	587
22	838	65	641
24	914	68.3	702

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 300 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	3.75	0.5	1.5
0.75	4.62	0.56	1.88
1	4.88	0.62	2.12
1.25	5.25	0.69	2.5
1.5	6.12	0.75	2.75
2	6.5	0.81	3.31
2.5	7.5	0.94	3.94
3	8.25	1.06	4.62
3.5	9	1.12	5.25
4	10	1.19	5.75
5	11	1.31	7
6	12.5	1.38	8.12
8	15	1.56	10.25
10	17.5	1.81	12.62
12	20.5	1.94	14.75
14	23	2.06	16.75
16	25.5	2.19	19
18	28	2.31	21
20	30.5	2.44	23.12
22	33	2.56	25.25
24	36	2.69	27.62

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 400 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	95	14.2	38
0.75	117	15.7	48
1	124	17.5	54
1.25	133	20.6	64
1.5	155	22.4	70
2	165	25.4	84
2.5	190	28.4	100
3	210	31.8	117
3.5	229	35.1	133
4	254	35.1	146
5	279	38.1	178
6	318	41.1	206
8	381	47.8	260
10	444	53.8	321
12	521	57.2	375
14	584	60.5	425
16	648	63.5	483
18	711	66.5	533
20	775	69.8	587
22	838	73.2	641
24	914	76.2	702

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 400 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	3.75	0.56	1.5
0.75	4.62	0.62	1.88
1	4.88	0.69	2.12
1.25	5.25	0.81	2.5
1.5	6.12	0.88	2.75
2	6.5	1	3.31
2.5	7.5	1.12	3.94
3	8.25	1.25	4.62
3.5	9	1.38	5.25
4	10	1.38	5.75
5	11	1.5	7
6	12.5	1.62	8.12
8	15	1.88	10.25
10	17.5	2.12	12.62
12	20.5	2.25	14.75
14	23	2.38	16.75
16	25.5	2.5	19
18	28	2.62	21
20	30.5	2.75	23.12
22	33	2.88	25.25
24	36	3	27.62

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 600 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	95	14.2	38
0.75	117	15.7	48
1	124	17.5	54
1.25	133	20.6	64
1.5	155	22.4	70
2	165	25.4	84
2.5	190	28.4	100
3	210	31.8	117
3.5	229	35.1	133
4	273	38.1	152
5	330	44.4	189
6	356	47.8	222
8	419	55.6	273
10	508	63.5	343
12	559	66.5	400
14	603	69.8	432
16	686	76.2	495
18	743	82.6	546
20	813	88.9	610
22	870	95.2	663
24	940	101.6	718

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 600 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	3.75	0.56	1.5
0.75	4.62	0.62	1.88
1	4.88	0.69	2.12
1.25	5.25	0.81	2.5
1.5	6.12	0.88	2.75
2	6.5	1	3.31
2.5	7.5	1.12	3.94
3	8.25	1.25	4.62
3.5	9	1.38	5.25
4	10.75	1.5	6
5	13	1.75	7.44
6	14	1.88	8.75
8	16.5	2.19	10.75
10	20	2.5	13.5
12	22	2.62	15.75
14	23.75	2.75	17
16	27	3	19.5
18	29.25	3.25	21.5
20	32	3.5	24
22	34.25	3.75	26.25
24	37	4	28.25

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 900 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	121	22.4	38
0.75	130	25.4	44
1	149	28.4	52
1.25	159	28.4	64
1.5	178	31.8	70
2	216	38.1	105
2.5	244	41.1	124
3	241	38.1	127
4	292	44.5	159
5	349	50.8	190
6	381	55.6	235
8	470	63.5	298
10	546	69.8	368
12	610	79.2	419
14	641	85.9	451
16	705	88.9	508
18	787	101.6	565
20	857	108	622
24	1041	139.7	749

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 900 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	4.75	0.88	1.5
0.75	5.12	1	1.75
1	5.88	1.12	2.06
1.25	6.25	1.12	2.5
1.5	7	1.25	2.75
2	8.5	1.5	4.12
2.5	9.62	1.62	4.88
3	9.5	1.5	5
4	11.5	1.75	6.25
5	13.75	2	7.5
6	15	2.19	9.25
8	18.5	2.5	11.75
10	21.5	2.75	14.5
12	24	3.12	16.5
14	25.25	3.38	17.75
16	27.75	3.5	20
18	31	4	22.25
20	33.75	4.25	24.5
24	41	5.5	29.5

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 1500 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	121	22.4	38
0.75	130	25.4	44
1	149	28.4	52
1.25	159	28.4	64
1.5	178	31.8	70
2	216	38.1	105
2.5	244	41.1	124
3	267	47.8	133
4	311	53.8	162
5	375	73.2	197
6	394	82.6	229
8	483	91.9	292
10	584	108	368
12	673	124	451
14	749	133.4	495
16	826	146	552
18	914	162.1	597
20	984	177.8	641
24	1168	203.2	762

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 1500 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	4.75	0.88	1.5
0.75	5.12	1	1.75
1	5.88	1.12	2.06
1.25	6.25	1.12	2.5
1.5	7	1.25	2.75
2	8.5	1.5	4.12
2.5	9.62	1.62	4.88
3	10.5	1.88	5.25
4	12.25	2.12	6.38
5	14.75	2.88	7.75
6	15.5	3.25	9
8	19	3.62	11.5
10	23	4.25	14.5
12	26.5	4.88	17.75
14	29.5	5.25	19.5
16	32.5	5.75	21.75
18	36	6.38	23.5
20	38.75	7	25.25
24	46	8	30

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 2500 Flanges (Metric)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	133	30.2	43
0.75	140	31.8	51
1	159	35.1	57
1.25	184	38.1	73
1.5	203	44.4	79
2	235	50.8	95
2.5	267	57.2	114
3	305	66.5	133
4	356	76.2	165
5	419	91.9	203
6	483	108	235
8	552	127	305
10	673	165.1	375
12	762	184.2	441

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Dimensions of Class 2500 Flanges (U.S. Customary)

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	5.25	1.19	1.69
0.75	5.5	1.25	2
1	6.25	1.38	2.25
1.25	7.25	1.5	2.88
1.5	8	1.75	3.12
2	9.25	2	3.75
2.5	10.5	2.25	4.5
3	12	2.62	5.25
4	14	3	6.5
5	16.5	3.62	8
6	19	4.25	9.25
8	21.75	5	12
10	26.5	6.5	14.75
12	30	7.25	17.38

GENERAL NOTES:
(a) Dimensions are in inches unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

Table 8 Dimensions of Class 150 Flanges

Nominal Pipe Size	Outside Diameter of Flange	Minimum Thickness of Flange (1)	Diameter of Hub
0.5	89	9.7	30
0.75	99	11.2	38
1	108	12.7	49
1.25	117	14.2	59
1.5	127	15.9	65
2	152	17.5	78
2.5	178	20.6	90
3	190	22.4	108
3.5	216	22.4	122
4	229	22.4	135
5	254	22.4	164
6	279	23.9	192
8	343	26.9	246
10	406	28.4	305
12	483	30.2	365
14	553	33.3	400
16	597	35.1	457
18	635	38.1	505
20	698	41.1	559
22	749	44.4	610
24	813	46	663

GENERAL NOTES:
(a) Dimensions are in millimeters unless stated otherwise.

NOTES:
(1) Not applicable for Lapped flanges.

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Screenshot of the Flange Bolt Chart app showing flange dimensions for blind flange.