AGI BCX3 1549 - Fittings Torque Values

8210-00020 R1 155
4.2. 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 calculated +/- 10%.
Table 32. 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 33. 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 34. 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
FIELD LOADER S-DRIVE – PORTABLE GRAIN BELT CONVEYOR 4. APPENDIX