Please note the following guide should be used only when installing Checkfluid Products.
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 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.
|
