Standard Torque Values for Pipe Thread Fittings
Figure 206

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K04211
A 737-300/400/500MAINTENANCE MANUAL
TUBE
OUTSIDE
FITTING
TORQUE 1
TORQUE 2 DIAMETER
NUT SIZE
(POUND-INCHES)
(POUND-INCHES)
(INCHES)

1/4 -4
110
65
5/16 -5
140
90
3/8 -6
170
130
1/2 -8
280
260
5/8 -10
360
360
3/4 -12
450
500
1
-16
750
700
1-1/4 -20
900
900
1-1/2 -24
900
900
2
-32 2000

TORQUE VALUES ARE APPLICABLE TO:
(1)  
FLARED ALUMINUM TUBE ENDS

(2)  
FLARELESS ALUMINUM TUBE ENDS WITH BACS13BD OR BACS13BX SWAGED SLEEVES

(3)  
FLARELESS TYPE HOSE END FITTINGS WITH ALUMINUM INSERTS

(4)  
STANDARD MS FLARELESS TUBE ENDS ON 6061-T6 ALUMINUM TUBING AND ANNEALED CRES TUBING. ANNEALED CRES TUBING IS IDENTIFIED BY A WIDE YELLOW BAND ADJACENT TO TUBING-USE IDENTIFICATION CODE MARKINGS

2  TORQUE VALUES ARE APPLICABLE TO FLARED HOSE END FITTINGS WITH ALUMINUM INSERTS
NOTE:  TORQUE VALUES ARE APPLICABLE TO ALL WALL THICKNESSES FOR A GIVEN DIAMETER TUBE AND HAVE A |5% TOLERANCE.
Standard Torque Values for Low Pressure and Return Line Fittings
Figure 207

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A 737-300/400/500MAINTENANCE MANUAL
(INCHES) SIZE TUBING OR BULKHEAD. FITTINGS INSTALLATION TORQUE FOR THE SIZE OF THE BOSS FOR REDUCER FITTINGS. YOU MUST FIND THE CORRECT YOU MUST USE CARE WHEN YOU SELECT THE CORRECT TORQUE____NOTE: 43INSTALLATION TORQUE ON FLARELESS TUBING FITTINGS/BOSSES (POUND-INCHES, |5%) 
OD NO. DASH TUBE  STEEL AND TITANIUM TUBES 1  CRES TUBES ALUMINUM AND ANNEALED 2 

3/16  -3  100  80
1/4  -4  140  110 
5/16  -5  190  140
3/8  -6  270 170 
1/2  -8  500  280 
5/8  -10  700 360 
3/4  -12  900  450 
1  -16  1200  750 
1-1/4  -20  1600  900 
1-1/2  -24  2000  900 
2  -32  2000  ---

NOTE:____1. TO USE ALUMINUM TUBE TORQUE VALUES FOR ALUMINUM, STEEL, OR TITANIUM FITTINGS IN ALUMINUM BOSSES.
2.  TO USE STEEL TUBE TORQUE VALUE FOR STEEL OR TITANIUM FITTINGS INSTALLED IN STEEL OR TITANIUM BOSSES.

THESE TORQUE VALUES ARE APPLICABLE TO THESE TUBE ENDS:
A.  21-6-9 STEEL WITH BACS13BD OR BACS13BX SWAGED SLEEVE
B.  CRES STEEL WITH BACS13BD OR BACS13BX SWAGED SLEEVE
C.  MIL-T-6845 CRES WITH BACS13AP PRESET SLEEVE

D.  HOSE END FITTINGS WITH STEEL INSERTS (NIPPLES)
E.  ALL TITANIUM TUBE ENDS.

THESE TORQUE VALUES ARE APPLICABLE TO THESE TUBE ENDS:
A.  ALUMINUM WITH BACS13BD & BACS13BX SWAGED SLEEVES
B.  6061-T6 ALUMINUM WITH PRESET BACS13AP SLEEVES
C.  ANNEALED CRES WITH PRESET BACS13AP SLEEVES

D.  HOSE END FITTINGS WITH ALUMINUM INSERTS (NIPPLES).
Installation Torque for Flareless Tubing Fittings
Figure 208 (Sheet 1)

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A
737-300/400/500MAINTENANCE MANUAL
YOU MUST USE CARE WHEN YOU SELECT THE CORRECT TORQUE FOR REDUCER FITTINGS. YOU MUST FIND THE CORRECT FITTINGS INSTALLATION TORQUE FOR THE SIZE OF THE BOSS OR BULKHEAD.
　
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