Bolt flange selection chart

In this chapter Pipe flange dimensions and details will be covered in ASME B16.5 – In this standard, consider Pipe Flanges and Flanged Fittings for size NPS ½” to 24” .

More than 24″, from NPS 26” to 60” should be in ASME B16.47. Here only given details for 150 and 300 class flanges size (1/2 TO 24″). rigid coupling

Class 150 RF Flanges Bolts details in MM and INCH
Class 300 RF Flanges Bolts details in MM and INCH

Class 150 RF Flanges Bolts details in MM and INCH

Class 150 RF Flanges Bolts details in MM and INCH
*Nominal Pipe Size*	Flange OD size	Flange thickness (with raised face)	No. Of Bolts	Dia of Bolts(INCH)	Bolt Size Stud	Length of Stud	Machine Bolt Size	Machine Bolt Length	*Pipe Size in mm*
1/2	90	14.7	4	0.5	1/2	2-1/4	M14	50	15
3/4	100	16.3	4	0.5	1/2	2-1/2	M14	50	20
1	110	17.9	4	0.5	1/2	2-1/2	M14	55	25
1-1/4	115	19.5	4	0.5	1/2	2-3/4	M14	55	32
1-1/2	125	21.1	4	0.5	1/2	2-3/4	M14	65	40
2	150	22.7	4	0.63	5/8	3-1/4	M16	70	50
2-1/2	180	25.9	4	0.63	5/8	3-1/2	M16	75	65
3	190	29	4	0.63	5/8	3-1/2	M16	75	80
3-1/2	215	30.6	8	0.63	5/8	3-1/2	M16	75	90
4	230	32.2	8	0.63	5/8	3-1/2	M16	75	100
5	255	35.4	8	0.75	3/4	3-3/4	M20	85	125
6	280	37	8	0.75	3/4	4	M20	85	150
8	345	41.7	8	0.75	3/4	4-1/4	M20	90	200
10	405	48.1	12	0.88	7/8	4-1/2	M24	100	250
12	485	51.3	12	0.88	7/8	4-3/4	M24	100	300
14	535	54.4	12	1	1	5-1/4	M27	115	350
16	595	57.6	16	1	1	5-1/4	M27	115	400
18	635	60.8	16	1.13	1 1/8	5-3/4	M30	125	450
20	700	64	20	1.13	1 1/8	6-1/4	M30	140	500
24	815	70.3	20	1.25	1 1/4	6-3/4	M33	150	600

Class 300 RF Flanges Bolts details in MM and INCH

Class 300 RF Flanges Bolts details in MM and INCH
Nominal Pipe Size	Flange OD size	Flange thickness (with raised face)	No. of Bolts	Dia of Bolts(INCH)	Bolt Size Stud	Length of Stud	Machine Bolt Size	Machine Bolt Length	Pipe Size in mm
1/2	95	14.7	4	0.5	1/2	2-1/2	M14	55	15
3/4	115	16.3	4	0.63	5/8	3	M16	65	20
1	125	17.9	4	0.63	5/8	3	M16	65	25
1-1/4	135	19.5	4	0.63	5/8	3-1/4	M16	70	32
1-1/2	155	21.1	4	0.75	3/4	3-1/2	M20	75	40
2	165	22.7	8	0.63	5/8	3-1/2	M16	75	50
2-1/2	190	25.9	8	0.75	3/4	4	M20	85	65
3	210	29	8	0.75	3/4	4-1/4	M20	90	80
3-1/2	230	30.6	8	0.75	3/4	4-1/4	M20	95	90
4	255	32.2	8	0.75	3/4	4-1/2	M20	95	100
5	280	35.4	8	0.75	3/4	4-3/4	M20	110	125
6	320	37	12	0.75	3/4	4-3/4	M20	110	150
8	380	41.7	12	0.88	7/8	5-1/2	M24	120	200
10	445	48.1	16	1	12/31	6-1/4	M27	140	250
12	520	51.3	16	1.13	1 1/8	6-3/4	M30	145	300
14	585	54.4	20	1.13	1 1/8	7	M30	160	350
16	650	57.6	20	1.25	1 1/4	7-1/2	M33	165	400
18	710	60.8	24	1.25	1 1/4	7-3/4	M33	170	450
20	775	64	24	1.25	1 1/4	8	M33	185	500
24	915	70.3	24	1.5	1 1/2	9	M39	205	600