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Home » How To » Tighten a Sampling Valve/Tube

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Tighten a Sampling Valve/Tube

These Specifications are for carbon steel. With Zinc plating always lubricate threads and seals.
For stainless steel, use the high value of the torque range of steel.
For brass, use 70% of the torque value of steel.
For mixed metals, use the torque of the lower of the two metals
Torque range is normally calculated +/- 10%.
To convert from N-m to ft-lbs, multiply N-m by 0.7375.

 

Tube / Hose Size
Tube / Hose Tube OD / Hose ID
-2 1/8"
-3 3/16"
-4 1/4"
-5 5/16"
-6 3/8"
-8 1/2"
-10 5/8"
-12 3/4"
-14 7/8"
-16 1"
-20 1 1/4"
-24 1 1/2"
-32 2"

Pipe Rigid - Tapered Pipe Threads (NPTF, N/NF) - Carbon Steel
Pipe Size Turns-from-finger Max ft-lbs Max N-m
1/8" (-2) 3/4 - 1 3/4
12 16
1/4" (-4) 3/4 - 1 3/4 25 34
3/8" (-6) 3/4 - 1 3/4 40 54
1/2" (-8) 1/2 - 1 1/2
54 73
3/4" (-12) 1/2 - 1 1/2 78 106
1" (-16) 1/2 - 1 1/2 112 152
1 1/4" (-20) 1/2 - 1 1/2 154 209
1 1/2" (-24) 1/2 - 1 1/2 211 286
2" (-32) 1/2 - 1 1/2 300 407
 For reference only. Source: Air-Way Manufacturing Co. - Carbon Steel Hydraulic

Pipe Swivel - Straight Pipe Threads (NPSM, N/NFS) - Carbon Steel
Pipe Size Max ft-lbs Max N-m
1/8" (-2) 12 16
1/4" (-4) 25 34
3/8" (-6) 40 54
1/2" (-8) 54 73
3/4" (-12) 78 106
1" (-16) 112 152
1 1/4" (-20) 154 209
1 1/2" (-24) 211 286
2" (-32) 300 407
Note: seals on an internal male 30° seat
 For reference only. Source: Air-Way Manufacturing Co. - Carbon Steel Hydraulic


Stud End O-Ring Boss (ORB) SAE (U/UF)
Carbon Steel
Tube Size
Thread UNF-2A
Max ft-lbs Max N-m
-2 5/16" - 24
6-7 8-9
-3 3/8" - 24
8-9 11-12
-4 7/16" - 20
13-15 18-20
-5 1/2" - 20
17-19 23-26
-6 9/16" - 18
22-24 29-33
-8 3/4" - 16
40-43 49-53
-10 7/8" - 14
43-48 59-64
-12 1 1'16" - 12
68-75 93-102
-14 1 3/16" - 12
90-99 122-134
-16 1 5/16" - 12 112-123 151-166
-20 1 5/8" - 12 146-161 198-218
-24 1 7/8" - 12 154-170 209-231
 For reference only. Source: Air-Way Manufacturing Co. - Carbon Steel Hydraulic

 


Stud End O-Ring Boss (ORB) Metric
Thread
ME/MCA (Torque N-m)
MCB (Torque N-m)
MB (Torque N-m)
M8x1 8
n/a
n/a
M10x1 15
9
18
M12x1.5 25
20
30
M14x1.5 35
35
45
M16x1.5 40
45
65
M18x1.5 45
55
80
M22x1.5 60
65
140
M27x2 100
90
190
M30x2 130
n/a
n/a
M33x2 160
150
340
M42x2 210
240
500
M48x2 260 290 630
M60x2 315
n/a
n/a
 For reference only. Source: SAE J2244 Rev Jun 98, table 5

JIC 37° Flare Tube Fitting (J/JFS)
Tube Size
Thread UNF-2A
Torque ft-lbs
Torque N-m
-2 5/16 - 24
6-7
8-9
-3 3/8 - 24
8-9
11-12
-4 7/16 - 20
11-12
15-16
-5 1/2 - 20
14-15
19-21
-6 9/16 - 18
18-20
24-28
-8 3/4 - 16
36-39
49-53
-10 7/8 - 14
57-63
77-85
-12 1 1/16 - 12
79-88
107-119
-14 1 3/16 - 12
94-103
127-140
-16 1 5/16 - 12
108-113
147-154
-20 1 5/8 - 12
127-133
172-181
-24 1 7/8 - 12
158-167 215-226
-32 2 1/2 - 12
245-258
332-350
 For reference only. Source: Air-Way Manufacturing Co. - Assembly instructions for 37° tube fittings, table A1

 


O-Ring Face Seal Fitting (ORFS) (F/FF)
Tube Size
Thread Size UNF-2A
Torque ft-lbs
Torque N-m
-4
9/16 - 18
10-12
14-16
-6 11/16 - 16
18-20
24-27
-8 13/16 - 16
32-35
43-47
-10 1 1/4 - 14
46-50
60-68
-12 1 3/16 - 12
65-70
90-95
-16 1 7/16 - 12
92-100
125-135
-16 1 11/16 - 12
125-140
170-190
-20 2 - 12
150-165
200-225
 For reference only. Source: SAE J1453 Rev Jun 98

 

Inverted 45° Flare Tube Nut
  Carbon Steel Stainless Steel
Tube Size Torque (lb-ft) Torque (N-m) Torque (lb-ft) Torque (N-m)
-2 5 - 6 7 - 8 n/a n/a
-3 10 - 12 14 - 16 12 - 16 16 - 21
-4 12 - 14 16 - 19 16 - 19 21 - 26
-5 15 - 17 20 - 23 n/a n/a
-6 17 - 19 23 - 26 24 - 30 32 - 40
-7 25 - 27 34 - 37 n/a n/a
-8 33 - 35 45 - 47 40 - 45 54 - 61
-10 42 - 44 57 - 60 n/a n/a
-12 42 - 56 73 - 76 110 - 125 149 - 169
For reference only. Source: SAE J512 Rev. APR97

 

British Standard Parallel Pipe Thread (BSPP, ISO 1179)
Pipe Thread
Turns-from-finger
Torque ft-lbs
Torque N-m
1/8" - 28 2-3 13 18
1/4" - 19 2-3 37 50
3/8" - 19 2-3 46 63
1/2" - 14 2-3 118 160
3/4" - 14 2-3 148 200
1" - 11 2-3 250 340
1 1/4" - 11 1 1/2-2 1/2 332 450
1 1/2" - 11 1 1/2-2 1/2 413 560
2" - 11 1 1/2-2 1/2    

 

If the torque value you are looking for is not listed in the tables, contact your adapter manufacturer or refer to the SAE Fluid Connectors Standards Manual.