215627
155
Revision A
Table 6.10
O-Ring Face Seal (ORFS) Hydraulic Fittings (continued)
SAE Dash Size
Thread Size (in.)
Tube O.D. (in.)
Torque Value
12
Nm
lbf·ft
-24
1
–
2
1 1/2
315
–
347
232
–
256
-32
2 1/2
2
510
–
561
376
–
414
6.3.6
Tapered Pipe Thread Fittings
The standard torque values are provided for tapered pipe thread fittings. If a procedure specifies a different torque value
for the same type and size of fitting found in this topic, use the value specified in the procedure instead.
Assemble pipe fittings as follows:
1.
Check the components to ensure that the fitting and the port threads are free of burrs, nicks, scratches, and any form
of contamination.
2.
Apply paste-type pipe thread sealant to the external pipe threads.
3.
Thread the fitting into the port until it is hand-tight.
4.
Torque the connector to the appropriate torque angle. The turns from finger tight (TFFT) and flats from finger tight
(FFFT) values are shown in Table
. Make sure that the tube end of a shaped connector (typically 45° or
90°) is aligned to receive the incoming tube or hose assembly. Always finish the alignment of the fitting in the direction
of tightening. Never back off (loosen) the threaded connectors to achieve alignment.
5.
Clean all residue and any excess thread conditioner with an appropriate cleaner.
6.
Assess the final condition of the fitting. Pay special attention to the possibility of cracks in the port opening.
7.
Mark the final position of the fitting. If a fitting leaks, disassemble the fitting and check it for damage.
NOTE:
The failure of fittings due to overtorquing may not be evident until the fittings are disassembled.
Table 6.11 Hydraulic Fitting Pipe Thread
Tapered Pipe Thread Size
Recommended TFFT
Recommended FFFT
1/8
–
27
2
–
3
12
–
18
1/4
–
18
2
–
3
12
–
18
3/8
–
18
2
–
3
12
–
18
1/2
–
14
2
–
3
12
–
18
3/4
–
14
1.5
–
2.5
12
–
18
1
–
11 1/2
1.5
–
2.5
9
–
15
1 1/4
–
11 1/2
1.5
–
2.5
9
–
15
1 1/2
–
11 1/2
1.5
–
2.5
9
–
15
2
–
11 1/2
1.5
–
2.5
9
–
15
12.
Torque values and angles shown are based on lubricated connection as in reassembly.
