THE MAXIMUM TORQUE PERMITTED FOR THE ALIGNMENT OF THE CASTELLATED NUT AND THE HOLE TO PUT IN ACOTTER PIN OR THE OTHER SAFETY DEVICE.
Torque Values for Bolts and Nuts
Figure 202 (Sheet 2)
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MAINTENANCE MANUAL
TORQUE - SELF-LOCKING NUTS 1
SIZE (REF BPS-N-70) FINE THREADS SIZE (REF MIL-N-25027) COARSE THREADS
TORQUE (POUND-INCHES) TORQUE (POUND-INCHES)
USED NUT NEW NUT LOCKING MINIMUM MAXIMUM LOCKING
MINIMUM BREAKAWAY MAXIMUM LOCKING BREAKAWAY MINIMUM 1ST CYCLE
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 70.0 135 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 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 PAST THE NUT. UMCHAMFERED BOLTS MUST COME OUT OF AT LEAST 1-1/2 THREADS PAST 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 THE INSTALLATION OR REMOVAL OF NUTS WITH NO LOAD ON THE BASE OF NUT.
Torque Values for Self-Locking Nuts
Figure 203
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20-11-00
ALL ú ú 01 Page 206 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
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