Pratt & Whitney Torque Chart


Thread Size***	Torque (inch-pounds) **Divide by 12 for ft-lbs
	Oil Lubricated Threads			Anti-seized Coated Threads
	Min.*	Min.**	Max.	Min.*	Min.**	Max.
#4-40	4.5	5	6	3.5	4	4.5
#6-32	8.5	10	11.5	6.5	7.5	8.5
#8-32	16	20	22	12.5	15	16.5
#8-36	18	22	24	13.5	16	18
#10-24	23	27	30	16	19.5	21.5
#10-32	24	32	36	19.5	23	26
#12-24	35	43	48	26	31	35
#12-28	35	45	50	28	34	38
1/4 - 20	50	65	70	37	45	50
1/4 - 28	65	75	85	45	54	60
5/16 - 18	110	135	150	80	95	105
5/16 - 24	125	150	170	90	110	120
3/8 - 16	200	250	270	140	170	185
3/8 - 24	225	275	300	160	190	215
7/16 - 14	325	375	425	225	270	300
7/16 - 20	350	425	475	255	310	340
1/2 - 13	500	600	650	340	400	450
1/2 - 20	550	675	750	390	460	515
9/16 - 12	700	850	950	500	600	675
9/16 - 18	800	950	1050	550	675	750
5/8 - 11	1000	1200	1300	675	800	900
5/8 - 18	1150	1350	1500	775	925	1025
3/4 - 10	1700	2100	2600	1350	1600	1800
3/4 - 16	2000	2400	2600	1350	1600	1800
7/8 - 9	2800	3400	3700	1950	2350	2600
7/8 - 14	3200	3800	4200	2200	2600	2900
1 - 8	4200	5100	5600	2900	3500	3900
1 - 12	4800	5800	6400	3200	3850	4300

* When alignment of locking holes (cotter pins, lockwire, etc.) is required at assembly.
** When alignment of locking holes is not required at assembly.
*** For screws larger than .164 thread size, having screwdriver slots only (no external wrenching provisions)
22 lb-in minimum (22 lb-in plus torque required to turn screw through nut, for self-locking applications).

NOTE: For thin nuts, where height of nut is 40% to 75% of major diameter, reduce torque value 50%.