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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
M(E), ORB (Torque N-m)
MB, Bonded Washer Copper Seal (Torque N-m)
M8x1 8
n/a
M10x1 15
9
M12x1.5 25
20
M14x1.5 35
35
M16x1.5 40
45
M18x1.5 45
55
M22x1.5 60
65
M27x2 100
90
M30x2 130
n/a
M33x2 160
150
M42x2 210
240
M48x2 260 290
M60x2 315
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 - 14
46-50
60-68
-12 1 3/16 - 12
65-70
90-95
-16 1 7/16 - 12
92-100
125-135
-20 1 11/16 - 12
125-140
170-190
-24 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 Tapered and Parallel Pipe Thread (BSPT, ISO 7 and 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.