Tightening Torques for Imperial Fasteners

IMPERIAL FASTNERS	TORQUE – LB.FT. CLASS – 1	TORQUE – LB.FT. CLASS – 2
¼ – UNC	8	4
5/16 – UNC	20	10
3/8 – UNC	35	18
7/16 – UNC	50	25
½ – UNC	80	40
5/8 – UNC	160	80
¾ – UNC	285	140
7/8 – UNC	455	225
1 – UNC	665	330
1 1/8 – UNC	985	490
1 ¼ – UNC	1390	695
1 3/8 – UNC	1810	905
1 ½ – UNC	2410	1205

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