Metric Face Seal and O-Ring Stud End Fitting Torque Chart—High Pressure Applications

N79757-UN-13FEB08

A - Stud Straight and Tube Nut

B - Bulkhead Union and Bulkhead Lock Nut

C - 90° Swivel Elbow and Tube Nut

D - 90° Adjustable Stud Elbow

E - Port Plug

F - Stud End

G - Tube Nut

H - Swivel Nut

I - Lock Nut

Metric Face Seal and O-Ring Stud End Fitting Torque Chart—High Pressure-Above 27.6 MPA (4,000 PSI), Working Pressure-41.3 MPA (6,000 PSI)
Nominal Tube OD Hose ID				O-Ring Face Seal/ Tube Swivel Nut				Bulkhead Jam Nut TorqueA			O-Ring Straight, Adjustable, and External Port Plug Stud EndsA
Metric Tube OD	Inch Tube OD			Thread Size	Swivel Nut Hex Size	Tube Nut/Swivel Nut Torque		Jam Nut Hex Size	Jam Nut Torque		Thread Size	Straight Hex SizeB	Adj Lock Nut Hex Size	Steel or Gray Iron Torque
mm	Dash Size	in.	mm	in.	mm	N˙m	lb-ft	mm	N˙m	lb-ft	mm.	mm	mm	N·m	lb-ft
4	-2	0.125	3.18	—	—	—	—	—	—	—	M8 X 1	12	12	8	6
5	-3	0.188	4.76	—	—	—	—	—	—	—	M10 X 1	14	14	15	11
6	-4	0.250	6.35	9/16-18	17	24	18	22	32	24	M12 X 1.5	17	17	35	26
8	-5	0.312	7.92	—	—	—	—	—	—	—	M14 X 1.5	19	19	45	33
10	-6	0.375	9.53	11/16-16	22	37	27	27	42	31	M16 X 1.5	22	22	55	41
12	-8	0.500	12.70	13/16-16	24	63	46	30	93	69	M18 X 1.5	24	24	70	52
16	-10	0.625	15.88	1-14	30	103	76	36	118	87	M22 X 1.5	27	27	100	74
20	-12	0.750	19.05	1-3/16-12	36	152	112	41	175	129	M27 X 2	32	32	170	125
22	-14	0.875	22.23	1-3/16-12	36	152	112	41	175	129	M30 X 2	36	36	215	159
25	-16	1.000	25.40	1-7/16-12	41	214	158	46	247	182	M33 X 2	41	41	260	192
28	—	—	—	—	—	—	—	—	—	—	M38 x 2	46	46	320	236
32	-20	1.250	31.75	1-11/16-12	—	286	211	50	328	242	M42 X 2	50	50	360	266
38	-24	1.500	38.10	2-12	—	326	240	60	374	276	M48 X 2	55	55	420	310
A Tolerance is +15%, minus 20% of mean tightening torque unless otherwise specified.
B The straight hex wrench sizes listed apply to connectors only and may not be the same as the corresponding plug of the same thread size.