Universal Bolt Torque Values for 1/8" thick Ring Gaskets - ANSI B16.47 Class 300# Flanges
Nominal	Raised Face	Raised Face	Gasket	Number	Size of	Bolt Torque	Comp Force	Max. Gasket	Internal	Min. Rec'd	Min. Rec'd	Max. Rec'd/Avail.	Preferred
Pipe Size	Contact I.D.	Contact O.D.	Contact Area	Of	Bolts	at 60ksi Stress	Per Bolt @ 60ksi	Stress Avail.	Pressure	Gasket Stress	Torque/Bolt	Gasket Stress	Torque/Bolt
(in)	(in)	(in)	(sq.in.)	Bolts	(in)	(ft.lbs.)	(lbs.)	(psi)	(psig)	(psi)	(ft.lbs.)	(psi)	(ft.lbs.)
26	26.00	29.50	152.49	28	1.63	2200	100800	18509	<800	7584	901	15000	1783
28	28.00	31.50	163.48	28	1.63	2200	100800	17265	<800	7812	995	15000	1911
30	30.00	33.75	187.66	28	1.75	3000	118800	17725	<800	7812	1322	15000	2539
32	32.00	36.00	213.52	28	1.88	4000	138240	18128	<800	7812	1724	15000	3310
34	34.00	38.00	226.08	28	1.88	4000	138240	17121	<800	8011	1872	15000	3504
36	36.00	40.25	254.39	32	2.00	4400	159120	20016	<800	7999	1758	15000	3297
38	38.00	40.50	154.06	32	1.50	1600	84300	17510	<800	10686	976	15000	1371
40	40.00	42.75	178.64	32	1.63	2200	100800	18057	<800	10425	1270	15000	1828
42	42.00	44.75	187.27	32	1.63	2200	100800	17224	<800	10715	1369	15000	1916
44	44.00	47.00	214.31	32	1.75	3000	118800	17739	<800	10473	1771	15000	2537
46	46.00	49.00	223.73	28	1.88	4000	138240	17301	<800	10740	2483	15000	3468
48	48.00	51.25	253.21	32	1.88	4000	138240	17470	<800	10514	2407	15000	3434
50	50.00	53.50	284.37	32	2.00	4400	138240	15556	<800	10321	2919	15000	4243
52	52.00	55.50	295.36	32	2.00	4400	138240	14977	<800	10549	3099	15000	4407
54	54.00	57.75	328.96	28	2.25	6360	205380	17481	<800	10367	3772	15000	5457
56	56.00	59.75	340.74	28	2.25	6360	205380	16877	<800	10580	3987	15000	5653
58	58.00	62.00	376.80	32	2.25	6360	205380	17442	<800	10407	3795	15000	5470
60	60.00	64.00	389.36	32	2.50	8800	257520	21165	<800	10606	4410	15000	6237