Garlock Suggested Bolt Torque Values 300# Flange
for compressed sheet, GYLON and GRAPH-LOCK
for ASME B 16.5 Class 300# RF Flanges with A193GrB7 Bolts
Nom.		Size of	Internal	Minimum	Preferred
Pipe size	No. of	Bolts	Pressure	Torque	Torque
(Inches)	Bolts	(Inches)	(psig)	(ft./lbs.)	(ft./lbs.)
0.5	4	0.50	800	12	28
0.75	4	0.63	800	21	51
1	4	0.63	800	28	67
1.25	4	0.63	800	43	102
1.5	4	0.75	800	64	151
2	8	0.63	800	46	108
2.5	8	0.75	800	60	141
3	8	0.75	800	88	200
3.5	8	0.75	800	99	200
4	8	0.75	800	125	200
5	8	0.75	800	156	200
6	12	0.75	800	131	200
8	12	0.88	800	205	320
10	16	1.00	800	219	490
12	16	1.13	800	319	710
14	20	1.13	800	287	652
16	20	1.25	800	401	912
18	24	1.25	800	489	1000
20	24	1.25	800	484	1000
24	24	1.50	800	662	1552