JAM NUTS

LOCKWIRED JAM NUTS NON-LOCKWIRED JAM NUTS
Torque Values for Bolts and Nuts
Figure 202 (Sheet 3)

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M47302
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747-400 MAINTENANCE MANUAL
LOCKING TORQUE - SELF-LOCKING NUTS 1
SIZE  FINE THREADS (REF BPS-N-70)  SIZE  COARSE THREADS (REF MIL-N-25027) 
TORQUE (POUND-INCHES)  TORQUE (POUND-INCHES) 
USED NUT  NEW NUT  MINIMUM LOCKING  LOCKING MAXIMUM 
BREAKAWAY MINIMUM  LOCKING MAXIMUM  MINIMUM 1ST CYCLE BREAKAWAY 
4-48  3  - 2-56  0.2  2.5 
6-40  1.0  6  - 4-40  0.5  5 
8-36  1.5  9  - 6-32  1.0  10 
10-32  2.0  13  - 8-32  1.5  15 
1/4-28  3.5  30  7  10-24  2.0  18 
5/16-24  6.5  60  12  1/4-20  4.5  30 
3/8-24  9.5  80  18  5/16-18  7.5  60 
7/16-20  14.0  100  26  3/8-16  12.0  80 
1/2-20  18.0  150  34  7/16-14  16.5  100 
9/16-18  24.0  200  46  1/2-13  24.0  150 
5/8-18  32.0  300  60  9/16-12  30.0  200 
3/4-16  50.0  400  90  5/8-11  40.0  300 
7/8-14  70.0  600  135  3/4-10  60.0  400 
1-14  90.0  800  180  7/8-9  82.0  600 
1-12  90.0  800  180  1-8  110.0  800 
1-1/8-12  117.0  900  234  1-1/8-7  137.0  900 
1-1/4-12  143.0  1000  285  1-1/4-7  165.0  1000 
1-3/8-12  165.0  1100  330  1-3/8-6  200.0  1200 
1-1/2-12  195.0  1250  386  1-1/2-6  230.0  1400 
1-3/4-12  245.0  1450  490  1-3/4-5  300.0  1800 
2-12  300.0  1700  600  2-4.5  360.0  2200 
2-1/4-4.5  430.0  2600 
2-1/2-4.5  500.0  3000 

THE FOLLOWING CONDITIONS MUST BE USED FOR TORQUES (REF BPS-N-70):
A.  THE MINIMUM-TO-MAXIMUM LOCKING TORQUE RANGE IS USED TO FIND THE CONDITION OF A USED SELF-LOCKING NUT AND BOLT SET.
B.  ALL NUT THREADS SHALL BE TOGETHER AND THE COMPLETE CHAMFER ON THE END OF THE BOLT SHALL COME OUT PASS THE NUT. UNCHAMFERED BOLTS MUST COME OUT AT LEAST 1-1/2 THREADS PASS THE NUT.
C.  THE REMOVAL WILL BE COMPLETE WHEN THE LOCKING DEVICE IS DISENGAGED.
D.  THE MINIMUM BREAKAWAY TORQUE IS THE TORQUE REQUIRED TO TURN A NUT OR BOLT FROM AN INSTALLED POSITION. THIS CONDITION IS FOR BOLT THREADS WITH NO LOAD ON THE BASE OF THE NUT.
E.  THE MAXIMUM LOCKING TORQUE IS THE MAXIMUM TORQUE DURING INSTALLATION OR REMOVAL OF NUTS WITH NO LOAD ON THE BASE OF THE NUT.
Locking Torque Values for Self-Locking Nuts
Figure 203

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

BACB30DP (CRES)
BACB30EL (STEEL)

BACB30NU (TITANIUM)  BACB30UR (TITANIUM)

BACB30LL (CRES)  BACB30VF (TITANIUM)

BACB30DP, BACB30EL, BACB30LL, BACB30NU, BACB30RF, BACB30UR, BACB30VF TORQUE RANGE
BOLT SIZE  (POUND -INCHES) 
8-32  10-13 
10-32  15-18 
1/4-28  26-30 
5/16-24  60-65 
3/8-24  95-105 
7/16-20  150-170 
1/2-20  220-245 
9/16-18  290-325 
5/8-18  395-435 
3/4-16  645-720 
7/8-14  1040-1150 
1-12 OR 1-14  1560-1730 
　
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