REFERENCE
6.1.8 Tapered Pipe Thread Fittings
Assemble pipe
fittings as follo ws :
1. Check compone
nts to ensure that fitting and port threads are free of burrs, nicks and scratches, or any form of
contaminatio
n.
2. Apply pipe th
read sealant (paste type) to external pipe threads.
3. Thread fittin
g into port until hand-tight.
4. Torque conn
ector to appropriate torque angle. The Turns From Finger Tight (TFFT) values are shown in Table
6.14 Hydrau
lic Fitting Pipe Thread, page 369. M ake sure that tube end of a shaped connector (typically 45º
or 90º) is al
igned to receive incoming tube or hose assembly. Always finish alignment of fitting in tightening
direction.
Never back off (loosen) pipe threaded connectors to achieve alignment.
5. Clean all r
esidue and any excess thread conditioner with appropriate cleaner.
6. Assess fina
l condition of fitting. Pay special attention to possib ility o f cracks to p ort op e ning .
7. Mark final p
osition of fitting. If a fitting leak s, disassemble fitting and check for damage.
NOTE:
Over-torque failure of fittings may not be evident until fittings are disa ss embled.
Table 6.14 Hydraulic Fitting Pipe Thread
Tapered Pipe
Thread Size
Recommended
T.F.F.T
Recommended
F.F.F.T
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
11/
2–11 1/2
1.5–2.5 9–15
2–11 1/2
1.5–2.5 9–15
147962 369 Revision A
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