JAM NUTS
LOCKWIRED JAM NUTS NON-LOCKWIRED JAM NUTS
Torque Values for Bolts and Nuts
Figure 202 (Sheet 3)
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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