Category: Fasteners

1. Technical drawings of flange bolting for Class 2500 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 2500 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2	5.25 135	3.50 88.9	7/8	4	3/4	4.75 120	4.50 115	4.75 120
3/4	5.50 140	3.75 95.2	7/8	4	3/4	5.00 125	4.75 120	5.00 125
1	6.25 160	4.25 108.0	1	4	7/8	5.50 140	5.25 135	5.50 140
1 1/4	7.25 185	5.12 130.2	1 1/8	4	1	6.00 150	5.75 145	6.00 150
1 1/2	8.00 205	5.75 146.0	1 1/4	4	1 1/8	6.75 170	6.50 165	6.75 170
2	9.25 235	6.75 171.4	1 1/8	8	1	7.00 180	6.75 170	7.00 180
2 1/2	10.50 265	7.75 196.8	1 1/4	8	1 1/8	7.75 195	7.50 190	8.00 205
3	12.00 305	9.00 228.6	1 3/8	8	1 1/4	8.75 220	8.50 215	9.00 230
4	14.00 355	10.75 273.0	1 5/8	8	1 1/2	10.00 255	9.75 250	10.25 260
5	16.50 420	12.75 323.8	1 7/8	8	1 3/4	11.75 300	11.50 290	12.25 310
6	19.00 485	14.50 368.3	2 1/8	8	2	13.50 345	13.25 335	14.00 355
8	21.75 550	17.25 438.2	2 1/8	12	2	15.00 380	14.75 375	15.50 395
10	26.50 675	21.25 539.8	2 5/8	12	2 1/2	19.25 490	19.00 485	20.00 510
12	30.00 760	24.38 619.1	2 7/8	12	2 3/4	21.25 540	21.00 535	22.00 560

1. For the denotation of dimensions “NPS, O, W, m, n, d, L1, L2, L3”, please refer to that of flange bolting for Class 1500. The length of the stud bolt doesn’t include the height of the points.

2. The bolting of ASME B16.5 class 2500 flanges can be furnished as stud bolts with nuts. Stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 1500 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 1500 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	4.75 120	3.25 82.6	7/8	4	3/4	4.25 110	4.00 100	4.25 110
3/4"	5.12 130	3.50 88.9	7/8	4	3/4	4.50 115	4.25 110	4.50 115
1"	5.88 150	4.00 101.6	1	4	7/8	5.00 125	4.75 120	5.00 125
1 1/4"	6.25 160	4.38 111.1	1	4	7/8	5.00 125	4.75 120	5.00 125
1 1/2"	7.00 180	4.88 123.8	1 1/8	4	1	5.50 140	5.25 135	5.50 140
2"	8.50 215	6.50 165.1	1	8	7/8	5.75 145	5.50 140	5.75 145
2 1/2"	9.62 245	7.50 190.5	1 1/8	8	1	6.25 160	6.00 150	6.25 160
3"	10.50 265	8.00 203.2	1 1/4	8	1 1/8	7.00 180	6.75 170	7.00 180
4"	12.25 310	9.50 241.3	1 3/8	8	1 1/4	7.75 195	7.50 190	7.75 195
5"	14.75 375	11.50 292.1	1 5/8	8	1 1/2	9.75 250	9.50 240	9.75 250
6"	15.50 395	12.50 317.5	1 1/2	12	1 3/8	10.25 260	10.00 255	10.50 265
8"	19.00 485	15.50 393.7	1 3/4	12	1 5/8	11.50 290	11.25 285	11.75 300
10"	23.00 585	19.00 482.6	2	12	1 7/8	13.25 335	13.00 330	13.50 345
12"	26.50 675	22.50 571.5	2 1/8	16	2	14.75 375	14.50 370	15.25 385
14"	29.50 750	25.00 635.0	2 3/8	16	2 1/4	16.00 405	15.75 400	16.75 425
16"	32.50 825	27.75 704.8	3 5/8	16	2 1/2	17.50 445	17.25 440	18.50 470
18"	36.00 915	30.50 774.7	2 7/8	16	2 3/4	19.50 495	19.25 490	20.75 525
20"	38.75 985	32.75 831.8	3 1/8	16	3	21.25 540	21.00 535	22.25 565
24"	46.00 1170	39.00 990.6	3 5/8	16	3 1/2	24.25 615	24.00 610	25.50 650

1. For the denotation of dimensions “NPS, O, W, m, n, d, L1, L2, L3”, please refer to that of flange bolting for Class 900. The length of the stud bolt doesn’t include the height of the points.

2. The bolting of ASME B16.5 class 1500 flanges can be furnished as stud bolts with nuts. Stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 900 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 900 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	4.75 120	3.25 82.6	7/8	4	3/4	4.25 110	4.00 100	4.25 110
3/4"	5.12 130	3.50 88.9	7/8	4	3/4	4.50 115	4.25 110	4.50 115
1"	5.88 150	4.00 101.6	1	4	7/8	5.00 125	4.75 120	5.00 125
1 1/4"	6.25 160	4.38 111.1	1	4	7/8	5.00 125	4.75 120	5.00 125
1 1/2"	7.00 180	4.88 123.8	1 1/8	4	1	5.50 140	5.25 135	5.50 140
2"	8.50 215	6.50 165.1	1	8	7/8	5.75 145	5.50 140	5.75 145
2 1/2"	9.62 245	7.50 190.5	1 1/8	8	1	6.25 160	6.00 150	6.25 160
3"	9.50 240	7.50 190.5	1	8	7/8	5.75 145	5.50 140	5.75 145
4"	11.50 290	9.25 235.0	1 1/4	8	1 1/8	6.75 170	6.50 165	6.75 170
5"	13.75 350	11.00 279.4	1 3/8	8	1 1/4	7.50 190	7.25 185	7.50 190
6"	15.00 380	12.50 317.5	1 1/4	12	1 1/8	7.50 190	7.25 185	7.75 195
8"	18.50 470	15.50 393.7	1 1/2	12	1 3/8	8.75 220	8.50 215	8.75 220
10"	21.50 545	18.50 469.9	1 1/2	16	1 3/8	9.25 235	9.00 230	9.25 235
12"	24.00 610	21.00 533.4	1 1/2	20	1 3/8	10.00 255	9.75 250	10.00 255
14"	25.25 640	22.00 558.8	1 5/8	20	1 1/2	10.75 275	10.50 265	11.00 280
16"	27.75 705	24.25 616.0	1 3/4	20	1 5/8	11.25 285	11.00 280	11.50 290
18"	31.00 785	27.00 685.8	2	20	1 7/8	12.75 325	12.50 320	13.25 335
20"	33.75 855	29.50 749.3	2 1/8	20	2	13.75 350	13.50 345	14.25 360
24"	41.00 1040	35.50 901.7	2 5/8	20	2 1/2	17.25 440	17.00 430	18.00 455

1. For the denotation of dimensions “NPS, O, W, m, n, d, L1, L2, L3”, please refer to that of flange bolting for Class 600. The length of the stud bolt doesn’t include the height of the points.

2. The bolting of ASME B16.5 class 900 flanges can be furnished as stud bolts with nuts. Stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 600 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 600 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	3.75 95	2.62 66.7	5/8	4	1/2	3.00 75	2.75 70	3.00 75
3/4"	4.62 115	3.25 82.6	3/4	4	5/8	3.50 90	3.25 85	3.50 90
1"	4.88 125	3.50 88.9	3/4	4	5/8	3.50 90	3.25 85	3.50 90
1 1/4"	5.25 135	3.88 98.4	3/4	4	5/8	3.75 95	3.50 90	3.75 95
1 1/2"	6.12 155	4.50 114.3	7/8	4	3/4	4.25 110	4.00 100	4.25 110
2"	6.50 165	5.00 127.0	3/4	8	5/8	4.25 110	4.00 100	4.25 110
2 1/2"	7.50 190	5.88 149.2	7/8	8	3/4	4.75 120	4.50 115	4.75 120
3"	8.25 210	6.62 168.3	7/8	8	3/4	5.00 125	4.75 120	5.00 125
3 1/2"	9.00 230	7.25 184.2	1	8	7/8	5.50 140	5.25 135	5.50 140
4	10.75 275	8.50 215.9	1	8	7/8	5.75 145	5.50 140	5.75 145
5	13.00 330	10.50 266.7	1 1/8	8	1	6.50 165	6.25 160	6.50 165
6	14.00 355	11.50 292.1	1 1/8	12	1	6.75 170	6.50 165	6.75 170
8	16.50 420	13.75 349.2	1 1/4	12	1 1/8	7.50 190	7.25 185	7.75 195
10	20.00 510	17.00 431.8	1 3/8	16	1 1/4	8.50 215	8.25 210	8.50 215
12	22.00 560	19.25 489.0	1 3/8	20	1 1/4	8.75 220	8.50 215	8.75 220
14	23.75 605	20.75 527.0	1 1/2	20	1 3/8	9.25 235	9.00 230	9.25 235
16	27.00 685	23.75 603.2	1 5/8	20	1 1/2	10.00 255	9.75 250	10.00 255
18	29.25 745	25.75 654.0	1 3/4	20	1 5/8	10.75 275	10.50 265	10.75 275
20	32.00 815	28.50 723.9	1 3/4	24	1 5/8	11.25 285	11.00 280	11.50 290
24	37.00 940	33.00 838.2	2	24	1 7/8	13.00 330	12.75 325	13.25 335

1. For the denotation of dimensions “NPS, O, W, m, n, d, L1, L2, L3”, please refer to that of flange bolting for Class 400. The length of the stud bolt doesn’t include the height of the points.

2. The bolting of ASME B16.5 class 600 flanges can be furnished as stud bolts with nuts. Stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 400 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 400 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	3.75 95	2.62 66.7	5/8	4	1/2	3.00 75	2.75 70	3.00 75
3/4"	4.62 115	3.25 82.6	3/4	4	5/8	3.50 90	3.25 85	3.50 90
1"	4.88 125	3.50 88.9	3/4	4	5/8	3.50 90	3.25 85	3.50 90
1 1/4"	5.25 135	3.88 98.4	3/4	4	5/8	3.75 95	3.50 90	3.75 95
1 1/2"	6.12 155	4.50 114.3	7/8	4	3/4	4.25 110	4.00 100	4.25 110
2"	6.50 165	5.00 127.0	7/8	8	5/8	4.25 110	4.00 100	4.25 110
2 1/2"	7.50 190	5.88 149.2	1	8	3/4	4.75 120	4.50 115	4.75 120
3"	8.25 210	6.62 168.3	1	8	3/4	5.00 125	4.75 120	5.00 125
3 1/2"	9.00 230	7.25 184.2	1 1/8	8	7/8	5.50 140	5.25 135	5.50 140
4"	10.00 255	7.88 200.0	1	8	7/8	5.50 140	5.25 135	5.50 140
5"	11.00 280	9.25 235.0	1	8	7/8	5.75 145	5.25 135	5.75 145
6"	12.50 320	10.62 269.9	1	12	7/8	6.00 150	5.75 145	6.00 150
8"	15.00 380	13.00 330.0	1 1/8	12	1	6.75 170	6.50 165	6.75 170
10"	17.50 445	15.25 387.4	1 1/4	16	1 1/8	7.50 190	7.25 185	7.50 190
12"	20.50 520	17.75 450.8	1 3/8	16	1 1/4	8.00 205	7.75 195	8.00 205
14"	23.00 585	20.25 514.4	1 3/8	20	1 1/4	8.25 210	8.00 205	8.25 210
16"	25.50 650	22.50 571.5	1 1/2	20	1 3/8	8.75 220	8.50 215	8.75 220
18"	28.00 710	24.75 628.6	1 1/2	24	1 3/8	9.00 230	8.75 220	9.00 230
20"	30.50 775	27.00 685.8	1 5/8	24	1 1/2	9.50 240	9.25 235	9.75 250
24"	36.00 915	32.00 812.8	1 7/8	24	1 3/4	10.50 265	10.25 260	11.00 280

1. NPS refers to Nominal Pipe Size, O – outside diameter of flange, W – Diameter of bolt circle, m – Diameter of bolt holes, n – number of bolts, d – diameter of bolts, L1 – length of stud bolts for 7 mm raised face, L2 – length of stud bolts for male and female tongue and groove, L3 – length of stud bolts for raised face.

2. The bolting of ASME B16.5 class 400 flanges can be furnished as stud bolts with nuts. Stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 300 ASME B16.5 flanges.

2. Dimensions of flange bolting for Class 300 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	3.75 95	2.62 66.7	5/8	4	1/2	2.50 65	3.00 75	2.25 55
3/4	4.62 115	3.25 82.6	3/4	4	5/8	3.00 75	3.50 90	2.50 65
1	4.88 125	3.50 88.9	3/4	4	5/8	3.00 75	3.50 90	2.50 65
1 1/4	5.25 135	3.88 98.4	3/4	4	5/8	3.25 85	3.75 95	2.75 70
1 1/2	6.12 155	4.50 114.3	7/8	4	3/4	3.50 90	4.00 100	3.00 75
2	6.50 165	5.00 127.0	3/4	8	5/8	3.50 90	4.00 100	3.00 75
2 1/2	7.50 190	5.88 149.2	7/8	8	3/4	4.00 100	4.50 115	3.25 85
3	8.25 210	6.62 168.3	7/8	8	3/4	4.25 110	4.75 120	3.50 90
3 1/2	9.00 230	7.25 184.2	7/8	8	3/4	4.25 110	5.00 125	3.75 95
4	10.00 255	7.88 200.0	7/8	8	3/4	4.50 115	5.00 125	3.75 95
5	11.00 280	9.25 235.0	7/8	8	3/4	4.75 120	5.25 135	4.25 110
6	12.50 320	10.62 269.9	7/8	12	3/4	4.75 120	5.50 140	4.25 110
8	15.00 380	13.00 330.2	1	12	7/8	5.50 140	6.00 150	4.75 120
10	17.50 445	15.25 387.4	1 1/8	16	1	6.25 160	6.75 170	5.50 140
12	20.50 520	17.75 450.8	1 1/4	16	1 1/8	6.75 170	7.25 185	5.75 145
14	23.00 585	20.25 514.4	1 1/4	20	1 1/8	7.00 180	7.50 190	6.25 160
16	25.50 650	22.50 571.5	1 3/8	20	1 1/4	7.50 190	8.00 205	6.50 165
18	28.00 710	24.75 628.6	1 3/8	24	1 1/4	7.75 195	8.25 210	6.75 170
20	30.50 775	27.00 685.8	1 3/8	24	1 1/4	8.00 205	8.75 220	7.25 185
24	36.00 915	32.00 812.8	1 5/8	24	1 1/2	9.00 230	10.00 255	8.00 205

1. For the denotation of dimensions “NPS, O, W, m, n, d, L1, L2, L3”, please refer to that of flange bolting for Class 150. The length of the stud bolt doesn’t include the height of the points.

2. The bolting of ASME B16.5 class 300 flanges can be furnished as machine bolt with nuts or stud bolts with nuts. Machine bolts shall be only used for flanges with raised face while stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units. The length of the stud bolt doesn’t include the height of the points.

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500

1. Technical drawings of flange bolting for Class 150 ASME B16.5 flanges.

2. Dimension of flange bolting for Class 150 ASME B16.5 flanges.

NPS	O inch mm	W inch mm	m inch	n	d inch	L1 inch mm	L2 inch mm	L3 inch mm
1/2"	3.50 90	2.38 60.3	5/8	4	1/2	2.25 55	-	2.00 50
3/4"	3.88 100	2.75 69.6	5/8	4	1/2	2.50 65	-	2.00 50
1"	4.25 110	3.12 79.4	5/8	4	1/2	2.50 65	3.00 75	2.25 55
1 1/4"	4.62 115	3.50 88.9	5/8	4	1/2	2.75 70	3.25 85	2.25 55
1 1/2"	5.00 125	3.88 98.4	5/8	4	1/2	2.75 70	3.25 85	2.50 65
2"	6.00 150	4.75 120.7	3/4	4	5/8	3.25 85	3.75 95	2.75 70
2 1/2"	7.00 180	5.50 139.7	3/4	4	5/8	3.50 90	4.00 100	3.00 75
3"	7.50 190	6.00 152.4	3/4	4	5/8	3.50 90	4.00 100	3.00 75
3 1/2"	8.50 215	7.00 177.8	3/4	8	5/8	3.50 90	4.00 100	3.00 75
4"	9.00 230	7.50 190.5	3/4	8	5/8	3.50 90	4.00 100	3.00 75
5"	10.00 255	8.50 215.9	7/8	8	3/4	3.75 95	4.25 110	3.25 85
6"	11.00 280	9.50 241.3	7/8	8	3/4	4.00 100	4.50 115	3.25 85
8"	13.50 345	11.75 298.5	7/8	8	3/4	4.25 110	4.75 120	3.50 90
10"	16.00 405	14.25 362.0	1	12	7/8	4.50 115	5.00 125	4.00 100
12"	19.00 485	17.00 431.8	1	12	7/8	4.75 120	5.25 135	4.00 100
14"	21.00 535	18.75 476.3	1 1/8	12	1	5.25 135	5.75 145	4.50 115
16"	23.5 595	21.25 539.8	1 1/8	16	1	5.25 135	5.75 145	4.50 115
18"	25.00 635	22.75 577.9	1 1/4	16	1 1/8	5.75 145	6.25 160	5.00 125
20"	27.50 700	25.00 635.0	1 1/4	20	1 1/8	6.25 160	6.75 170	5.50 140
24"	32.00 815	29.50 749.3	1 3/8	20	1 1/4	6.75 170	7.25 185	6.00 150

1. NPS refers to Nominal Pipe Size, O – outside diameter of flange, W – Diameter of bolt circle, m – Diameter of bolt holes, n – number of bolts, d – diameter of bolts, L1 – length of stud bolts for 2 mm raised face, L2 – length of stud bolts for ring joint face, L3 – length of machine bolts for raised face.

2. The bolting of ASME B16.5 class 150 flanges can be furnished as machine bolt with nuts or stud bolts with nuts. Machine bolts shall be only used for flanges with raised face while stud bolts can be used for flanges with either raised face or ring joint face. All dimensions are provided in mm and inch units.

3. Contact our sales team for a quick quote:  info@metalsflange.com

ASME B16.5 Flange Bolting Specification by Classes
Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500