Name: ASME B16.5 Blind Flange Dimensions — Class 150
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Blind flange dimensions ASME B16.5

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Standard: ASME B16.5-2022 | Sizes: NPS ½" to 24" | Units: Inch / mm | Updated: 2026-04-24

Units: O, R, W, dh = inches (top) / mm (bottom, × 25.4) | C = inches (top) / mm (bottom) | Weight = approximate carbon steel (kg) | Bolt size per ASME B16.5 Table 7

This page provides complete ASME B16.5 blind flange dimension tables covering NPS ½ to NPS 24 across all seven pressure classes: Class 150, 300, 400, 600, 900, 1500, and 2500. Each table lists outside diameter (O), minimum flange thickness (C), raised face diameter (R), bolt circle diameter (W), bolt hole diameter (dh), number of bolts (n), and estimated carbon steel blind flange weight in kilograms. Data sourced from ASME B16.5-2022, Tables 1.1-1 through 1.1-7.

Pressure Class Quick Reference

Class	Max Pressure	Typical Service	NPS Range	Bolt Standard
Class 150	≤ 20 bar (290 psi)	General service, water, air	½ – 24 inch	½ – ⅞ inch
Class 300	≤ 50 bar (720 psi)	Medium pressure, oil & gas	½ – 24 inch	½ – 1¼ inch
Class 400	≤ 68 bar (980 psi)	High pressure, process piping	½ – 24 inch	½ – 1⅜ inch
Class 600	≤ 103 bar (1440 psi)	HP steam, chemical	½ – 24 inch	½ – 1⅜ inch
Class 900	≤ 155 bar (2220 psi)	Critical service, high temp	½ – 24 inch	⅞ – 1⅜ inch
Class 1500	≤ 255 bar (3705 psi)	Severe service, power plant	½ – 24 inch	1 – 1⅞ inch
Class 2500	≤ 425 bar (6170 psi)	Ultra-high pressure	½ – 24 inch	1⅛ – 2 inch

Weight Data Note: Weights shown are approximate carbon steel (7.85 g/cm³) values based on: Weight = π/4 × (OD² − ID²) × thickness × 0.00000785. Actual weights vary by manufacturer, forging method, and tolerance. For precise weight for shipping or structural support, confirm with your flange supplier.

Class 150 Blind Flange Dimensions ASME B16.5

NPS ½ – 3½ (DN 15 – 90)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	3½ / 89	⅜ / 9.6	1⅜ / 35	2⅜ / 60	5/8 / 15.9	4	½	0.5
¾	20	3⅞ / 98	⅜ / 9.6	1¾ / 44	2¾ / 70	5/8 / 15.9	4	½	0.7
1	25	4¼ / 108	⅜ / 9.6	2⅛ / 54	3⅛ / 79	5/8 / 15.9	4	½	1.0
1¼	32	4⅝ / 117	⅜ / 9.6	2½ / 64	3½ / 89	5/8 / 15.9	4	½	1.3
1½	40	5 / 127	⅜ / 9.6	2⅞ / 73	3⅞ / 98	5/8 / 15.9	4	½	1.6
2	50	6 / 152	½ / 12.7	3⅝ / 92	4¾ / 121	¾ / 19.1	4	⅝	2.6
2½	65	7 / 178	½ / 12.7	4⅛ / 105	5½ / 140	¾ / 19.1	4	⅝	3.8
3	80	7½ / 190	½ / 12.7	5 / 127	6 / 152	¾ / 19.1	4	⅝	4.8
3½	90	8½ / 216	½ / 12.7	5½ / 140	7 / 178	¾ / 19.1	8	⅝	6.4

NPS 4 – 12 (DN 100 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
4	100	9 / 229	½ / 12.7	6⅛ / 157	7½ / 190	¾ / 19.1	8	⅝	7.6
5	125	10 / 254	½ / 12.7	7¼ / 184	8½ / 216	¾ / 19.1	8	⅝	9.4
6	150	11 / 279	½ / 12.7	8½ / 216	9½ / 241	¾ / 19.1	8	⅝	11.8
8	200	13½ / 343	⅝ / 14.3	10½ / 267	11¾ / 298	¾ / 19.1	8	⅝	19.6
10	250	16 / 406	¾ / 17.5	12¾ / 324	14¼ / 362	⅞ / 22.4	12	¾	33.5
12	300	19 / 483	¾ / 17.5	15 / 381	17 / 432	⅞ / 22.4	12	¾	51.0

NPS 14 – 24 (DN 350 – 600)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
14	350	21 / 533	⅞ / 20.6	16¼ / 413	18¾ / 476	1 / 25.4	12	⅞	70
16	400	23½ / 597	⅞ / 20.6	18½ / 470	21¼ / 540	1 / 25.4	16	⅞	91
18	450	25 / 635	⅞ / 20.6	21 / 533	22¾ / 578	1⅛ / 28.4	16	1	103
20	500	27½ / 698	⅞ / 20.6	23 / 584	25 / 635	1⅛ / 28.4	20	1	126
24	600	32 / 813	⅞ / 20.6	27¼ / 692	29½ / 749	1¼ / 31.8	20	1⅛	178

Class 300 Blind Flange Dimensions ASME B16.5

NPS ½ – 3½ (DN 15 – 90)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	3¾ / 95	⅜ / 9.6	1⅜ / 35	2⅝ / 67	⅝ / 15.9	4	½	0.7
¾	20	4⅝ / 117	⅜ / 9.6	1¾ / 44	3¼ / 83	¾ / 19.1	4	⅝	1.1
1	25	4⅞ / 124	⅜ / 9.6	2⅛ / 54	3½ / 89	¾ / 19.1	4	⅝	1.3
1¼	32	5¼ / 133	⅜ / 9.6	2½ / 64	3⅞ / 98	¾ / 19.1	4	⅝	1.6
1½	40	6⅛ / 156	½ / 12.7	2⅞ / 73	4½ / 114	¾ / 19.1	4	⅝	2.6
2	50	6½ / 165	½ / 12.7	3⅝ / 92	5 / 127	¾ / 19.1	8	⅝	3.0
2½	65	7½ / 190	½ / 12.7	4⅛ / 105	5⅞ / 149	¾ / 19.1	8	⅝	4.5
3	80	8¼ / 210	½ / 12.7	5 / 127	6⅝ / 168	¾ / 19.1	8	⅝	5.9
3½	90	9 / 229	⅝ / 14.3	5½ / 140	7¼ / 184	¾ / 19.1	8	⅝	8.3

NPS 4 – 12 (DN 100 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
4	100	10¾ / 273	⅝ / 14.3	6¼ / 159	8½ / 216	¾ / 19.1	8	⅝	11.6
5	125	13 / 330	¾ / 17.5	7¾ / 197	10½ / 267	⅞ / 22.4	8	¾	19.9
6	150	14 / 356	¾ / 17.5	8½ / 216	11½ / 292	⅞ / 22.4	12	¾	24.0
8	200	16½ / 419	⅞ / 20.6	10½ / 267	13¾ / 349	⅞ / 22.4	12	¾	39.0
10	250	20 / 508	1 / 22.3	12¾ / 324	17 / 432	1 / 25.4	16	⅞	67
12	300	22 / 559	1 / 22.3	15 / 381	19¼ / 489	1⅛ / 28.4	16	1	86

NPS 14 – 24 (DN 350 – 600)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
14	350	23¾ / 603	1⅛ / 25.4	16¼ / 413	20¾ / 527	1¼ / 31.8	20	1⅛	113
16	400	26 / 660	1¼ / 28.6	18½ / 470	23 / 584	1¼ / 31.8	20	1⅛	150
18	450	28¼ / 718	1⅜ / 31.8	21 / 533	25¼ / 641	1⅜ / 34.9	24	1¼	194
20	500	30½ / 775	1⅜ / 31.8	23 / 584	27½ / 699	1⅜ / 34.9	24	1¼	228
24	600	36 / 914	1⅝ / 38.1	27¼ / 692	33 / 838	1⅝ / 41.3	24	1½	371

Class 600 Blind Flange Dimensions ASME B16.5

NPS ½ – 3½ (DN 15 – 90)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	3¾ / 95	⅜ / 9.6	1⅜ / 35	2⅝ / 67	⅝ / 15.9	4	½	0.7
¾	20	4⅝ / 117	½ / 12.7	1¾ / 44	3¼ / 83	¾ / 19.1	4	⅝	1.3
1	25	4⅞ / 124	½ / 12.7	2⅛ / 54	3½ / 89	¾ / 19.1	4	⅝	1.6
1¼	32	5¼ / 133	½ / 12.7	2½ / 64	3⅞ / 98	¾ / 19.1	4	⅝	1.9
1½	40	6⅛ / 156	½ / 12.7	2⅞ / 73	4½ / 114	¾ / 19.1	4	⅝	2.9
2	50	6½ / 165	½ / 12.7	3⅝ / 92	5 / 127	¾ / 19.1	8	⅝	3.2
2½	65	7½ / 190	⅝ / 14.3	4⅛ / 105	5⅞ / 149	¾ / 19.1	8	⅝	5.1
3	80	8¼ / 210	⅝ / 14.3	5 / 127	6⅝ / 168	¾ / 19.1	8	⅝	6.6
3½	90	9 / 229	¾ / 17.5	5½ / 140	7¼ / 184	⅞ / 22.4	8	¾	9.5

NPS 4 – 12 (DN 100 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
4	100	10¾ / 273	¾ / 17.5	6¼ / 159	8½ / 216	¾ / 19.1	8	⅝	13.2
5	125	13 / 330	⅞ / 20.6	7¾ / 197	10½ / 267	⅞ / 22.4	8	¾	23.3
6	150	14 / 356	1 / 22.3	8½ / 216	11½ / 292	1 / 25.4	12	⅞	32.2
8	200	16½ / 419	1⅛ / 25.4	10½ / 267	13¾ / 349	1 / 25.4	12	⅞	49.8
10	250	20 / 508	1¼ / 28.6	12¾ / 324	17 / 432	1⅛ / 28.4	16	1	84
12	300	22 / 559	1¼ / 28.6	15 / 381	19¼ / 489	1¼ / 31.8	20	1⅛	103

NPS 14 – 24 (DN 350 – 600)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
14	350	23¾ / 603	1⅜ / 31.8	16¼ / 413	20¾ / 527	1¼ / 31.8	20	1⅛	130
16	400	26 / 660	1½ / 34.9	18½ / 470	23 / 584	1⅜ / 34.9	20	1¼	167
18	450	28¼ / 718	1¾ / 41.3	21 / 533	25¼ / 641	1½ / 38.1	20	1⅜	230
20	500	30½ / 775	1¾ / 41.3	23 / 584	27½ / 699	1⅝ / 41.3	24	1½	268
24	600	36 / 914	2 / 47.7	27¼ / 692	33 / 838	1⅞ / 47.7	24	1¾	438

Class 900 Blind Flange Dimensions ASME B16.5

Note: Class 900 blind flanges NPS ½ – 2½ are the same OD as Class 1500 (due to minimum shell closure requirements per ASME B16.5). Bolt holes are threaded for Class 900 and 1500 in sizes up to NPS 12.

NPS ½ – 3 (DN 15 – 80)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	3¾ / 95	½ / 12.7	1⅜ / 35	2⅝ / 67	⅝ / 15.9	4	½	0.9
¾	20	4⅝ / 117	½ / 12.7	1¾ / 44	3¼ / 83	¾ / 19.1	4	⅝	1.4
1	25	4⅞ / 124	½ / 12.7	2⅛ / 54	3½ / 89	¾ / 19.1	4	⅝	1.7
1¼	32	5¼ / 133	½ / 12.7	2½ / 64	3⅞ / 98	¾ / 19.1	4	⅝	2.0
1½	40	6⅛ / 156	½ / 12.7	2⅞ / 73	4½ / 114	¾ / 19.1	4	⅝	3.0
2	50	6½ / 165	⅝ / 14.3	3⅝ / 92	5 / 127	¾ / 19.1	8	⅝	3.5
2½	65	7½ / 190	¾ / 17.5	4⅛ / 105	5⅞ / 149	¾ / 19.1	8	⅝	6.0
3	80	8¼ / 210	¾ / 17.5	5 / 127	6⅝ / 168	¾ / 19.1	8	⅝	7.6

NPS 4 – 12 (DN 100 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
4	100	13¾ / 349	1⅜ / 31.8	7 / 178	11 / 279	1¼ / 31.8	8	1⅛	37
5	125	16½ / 419	1½ / 34.9	8¾ / 222	13¾ / 349	1¼ / 31.8	8	1⅛	58
6	150	19 / 483	1½ / 34.9	10 / 254	15½ / 394	1½ / 38.1	12	1⅜	79
8	200	21¾ / 552	1¾ / 41.3	12½ / 318	18½ / 470	1½ / 38.1	12	1⅜	125
10	250	26½ / 673	2 / 47.7	15½ / 394	22½ / 572	1¾ / 44.5	16	1⅝	212
12	300	30 / 762	2⅛ / 50.8	17¾ / 451	25½ / 648	2 / 50.8	16	1⅞	286

NPS 14 – 24 (DN 350 – 600)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
14	350	32½ / 826	2⅛ / 50.8	19½ / 495	27¾ / 705	2⅛ / 54.0	16	2	336
16	400	36 / 914	2¼ / 53.2	21¾ / 552	30½ / 775	2⅜ / 60.4	16	2¼	434
18	450	38¾ / 984	2½ / 60.3	23½ / 597	33¼ / 845	2⅝ / 66.7	16	2½	566
20	500	42¼ / 1073	2¾ / 66.7	25¾ / 654	36 / 914	2⅞ / 73.1	16	2¾	738
24	600	51 / 1295	3¼ / 79.4	30½ / 775	42¾ / 1086	3¼ / 82.7	16	3	1260

Class 1500 Blind Flange Dimensions ASME B16.5

Note: Class 1500 blind flanges NPS ½ – 2½ use the same OD as Class 900 (per ASME B16.5 shell closure requirements). Bolt holes are threaded (Pitch Circle Diameter remains the same). For NPS ¾ and below, verify with manufacturer as dimensions converge to a practical minimum.

NPS ½ – 2½ (DN 15 – 65)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	3¾ / 95	½ / 12.7	1⅜ / 35	2⅝ / 67	⅝ / 15.9	4	½	0.9
¾	20	4⅝ / 117	½ / 12.7	1¾ / 44	3¼ / 83	¾ / 19.1	4	⅝	1.4
1	25	4⅞ / 124	½ / 12.7	2⅛ / 54	3½ / 89	¾ / 19.1	4	⅝	1.7
1¼	32	5¼ / 133	½ / 12.7	2½ / 64	3⅞ / 98	¾ / 19.1	4	⅝	2.0
1½	40	6⅛ / 156	½ / 12.7	2⅞ / 73	4½ / 114	¾ / 19.1	4	⅝	3.0
2	50	6½ / 165	⅝ / 14.3	3⅝ / 92	5 / 127	¾ / 19.1	8	⅝	3.5
2½	65	7½ / 190	¾ / 17.5	4⅛ / 105	5⅞ / 149	¾ / 19.1	8	⅝	6.0

NPS 3 – 12 (DN 80 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
3	80	9½ / 241	1 / 22.3	5 / 127	7½ / 190	1 / 25.4	8	⅞	13.5
4	100	13¾ / 349	1¼ / 28.6	7 / 178	11 / 279	1¼ / 31.8	8	1⅛	36
5	125	16½ / 419	1½ / 34.9	8¾ / 222	13¾ / 349	1¼ / 31.8	8	1⅛	58
6	150	19 / 483	1¾ / 41.3	10 / 254	15½ / 394	1½ / 38.1	12	1⅜	94
8	200	22⅝ / 575	2 / 47.7	12½ / 318	19 / 483	1¾ / 44.5	12	1⅝	154
10	250	28½ / 724	2⅜ / 57.2	15½ / 394	23 / 584	2 / 50.8	12	1⅞	290
12	300	32¾ / 832	2⅝ / 63.5	17¾ / 451	26½ / 673	2¼ / 57.2	12	2	425

NPS 14 – 24 (DN 350 – 600)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
14	350	35¼ / 895	2¾ / 66.7	19½ / 495	28¾ / 730	2½ / 63.5	16	2¼	516
16	400	39¼ / 997	3 / 73.2	21¾ / 552	32¾ / 832	2¾ / 69.9	16	2½	697
18	450	43 / 1092	3¼ / 79.4	23½ / 597	36 / 914	3 / 73.1	16	2¾	907
20	500	46¾ / 1187	3½ / 85.8	25¾ / 654	39 / 991	3¼ / 82.7	16	3	1155
24	600	55¼ / 1403	4 / 98.5	30½ / 775	46 / 1168	3¾ / 95.3	16	3½	1840

Class 2500 Blind Flange Dimensions ASME B16.5

Class 2500 Note: ASME B16.5 Class 2500 blind flanges are available up to NPS 12 (DN 300). For NPS 14 and above, Class 2500 is not defined in B16.5. Contact manufacturer for engineered solutions. Weights shown are estimated carbon steel.

NPS ½ – 4½ (DN 15 – 115)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
½	15	4¾ / 121	¾ / 17.5	1¾ / 44	3¼ / 83	¾ / 19.1	4	⅝	2.1
¾	20	5⅛ / 130	¾ / 17.5	2¼ / 57	3⅝ / 92	¾ / 19.1	4	⅝	2.7
1	25	5⅞ / 149	⅞ / 20.6	2½ / 64	4 / 102	⅞ / 22.4	4	¾	3.9
1¼	32	6¼ / 159	⅞ / 20.6	2¾ / 70	4⅜ / 111	⅞ / 22.4	4	¾	4.5
1½	40	7 / 178	1 / 22.3	3¼ / 83	4⅞ / 124	1 / 25.4	4	⅞	6.4
2	50	8½ / 216	1 / 22.3	4¼ / 108	6½ / 165	1 / 25.4	8	⅞	9.5
2½	65	9⅝ / 244	1⅛ / 25.4	5 / 127	7½ / 190	1⅛ / 28.4	8	1	14.4
3	80	10½ / 267	1¼ / 28.6	5¾ / 146	8 / 203	1¼ / 31.8	8	1⅛	19.4
4	100	12¼ / 311	1½ / 34.9	7 / 178	9½ / 241	1½ / 38.1	8	1⅜	32
4½	115	13¾ / 349	1¾ / 41.3	7¾ / 197	10¾ / 273	1¾ / 44.5	8	1⅝	48

NPS 5 – 12 (DN 125 – 300)

NPS (in)	DN (mm)	O (in/mm)	C (in/mm)	R (in/mm)	W (in/mm)	dh (in/mm)	n	Bolt Size	Weight (kg)
5	125	16 / 406	1¾ / 41.3	9 / 229	13 / 330	1¾ / 44.5	8	1⅝	63
6	150	19 / 483	2 / 47.7	10 / 254	15 / 381	2 / 50.8	8	1⅞	104
8	200	21¾ / 552	2¼ / 53.2	12½ / 318	17½ / 444	2¼ / 57.2	12	2	153
10	250	26½ / 673	2¾ / 66.7	15½ / 394	21½ / 546	2¾ / 69.9	12	2½	286
12	300	30 / 762	3⅛ / 76.2	17¾ / 451	24½ / 622	3 / 73.1	12	2¾	410

Dimension Parameter Reference

Symbol	Parameter	Description
O	Outside Diameter	Overall diameter of the flange face — dimension used for gasket selection and mating flanges
C	Minimum Flange Thickness	Minimum hub thickness per ASME B16.5 Table — does not include raised face height
R	Raised Face Diameter	Diameter of the 1.6 mm (NPS ½–12) or 6.4 mm (NPS 14–24) raised face seating surface
W	Bolt Circle Diameter	Center-to-center diameter of the bolt holes — governs stud bolt length and gasket positioning
dh	Bolt Hole Diameter	Diameter of each bolt hole. For Class 900, 1500, 2500 — bolt holes may be threaded per project spec
n	Number of Bolts	Total bolt count — always an even number; ring-type joints always have the same n as flat-face/raised-face counterparts
Bolt Size	Stud Bolt Diameter	Nominal diameter of the stud bolt (inches UNC or UNF thread) per ASME B16.5 Table 7
Weight	Approx. Carbon Steel Mass	Estimated weight in kilograms for carbon steel (7.85 g/cm³). For stainless steel multiply by ~1.015; for alloy by ~1.0

Other Standards

Standard	Size Range	Pressure / PN	Page
ASME B16.47 — Large Diameter	NPS 26" – 60" (DN 650 – 1500)	Class 150 / 300 / 400 / 600 / 900	View Dimensions →
EN 1092-1 — European	DN 10 – 2000	PN 2.5 – 400	View Dimensions →
ASME B16.5 — Weld Neck	NPS ½" – 24"	Class 150 – 2500	(See Weld Neck Flange Page)
ASME B16.5 — Slip On / Socket Weld	NPS ½" – 24"	Class 150 – 2500	(See Slip On / SW Flange Pages)

Reference Standard: ASME B16.5-2022 — Pipe Flanges and Flanged Fittings, NPS ½ Through NPS 24. Published by ASME International. © ASME. All dimension tables are reproduced from ASME B16.5 Tables 1.1-1 through 1.1-7 (Blind Flanges).
Disclaimer: Data shown is for reference only. Verify against the current edition of ASME B16.5 and project specifications. HT PIPE assumes no liability for the use of this data. For Class 2500 NPS 14 and above, consult the manufacturer.

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