Flare Fitting Torque Chart - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE II-III. FLARE FITTING TORQUE CHART
TORQUE - INCH POUND
TUBING
OD
INCHES
ALUMINUM - ALLOY
TUBING FLARE-AND
10061 OR AND 10078
STEEL TUBING
FLARE
AND 10061
HOSE END FITTING
AND
HOSE ASSEMBLIES
MINIMUM MAXIMUM MINIMUM MAXIMUM MINIMUM MAXIMUM
1/8
3/16
1/4
5/16
3/8
1/2
5/8
3/4
1-1/4
1-1/2
1-3/4
2
40
60
75
150
200
300
500
600
600
65
80
125
250
350
500
700
900
900
90
135
180
270
450
650
900
1200
100 70
150 70
200
85
300 100
500 210
700 300
1000
500
1400
700
100
120
180
250
420
480
850
1150
2-8. TORQUE REQUIREMENTS. The torque values given in Table II-II are derived from oil free
cadmium-plated threads and are recommended for all airframe installation procedures where torquing is
required, unless otherwise noted in sections where other values are stipulated. Engine torque values are
found in the latest revision of Avco Lycoming Service Bulletin No. 268, and propeller torque values are
found in Section VIII of this manual. Table II-III list the torque values for flared fittings of various sizes
and material.
NOTE
When flared fittings are being installed, ascertain that the male
threads are properly lubricated. Torque the fittings in accordance
with Table II-III.
CAUTION
Do not over torque fittings.
a. Unless otherwise specified, torque all nuts to the applicable torque in the Recommended Nut Chart.
If the nut (or the bolt) is listed but not its mating fastener, use the lower torque specified for the listed nut (or
bolt).
Reissued: 9/23/80
HANDLING AND SERVICING
1B8