P1512161 R0
79
5.2. Fittings Torque Values
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 calc/- 10%.
Table 41.
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
Table 42.
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
3
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
Table 43.
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
SWING AWAY CONVEYOR – PORTABLE GRAIN BELT CONVEYOR
