2.  Castellated and Non-Self Locking Nuts - Use only the torque given in Chart
MS 20073
pin on moving joints, do not torque the nut. Turn the nut onto the bolt until

MS 20074
proper grip is established and alignment with the cotter pin hole is achieved.
AN 509 NK9
Then install the cotter pin.
MS 24694

GENERAL REQUIREMENTS.
AN 525 NK525

1.  Calibrate the torque wrench periodically to assure accuracy. Recheck
MS 27039
frequently.

2.  
Ascertain that the bolt and nut threads are clean and dry (unless otherwise specified by the manufacturers.) If the bolt or nut is required to be lubricated

NUTS
prior to tightening, the torque range should be reduced 50 percent.

3.  
Use a bolt long enough to prevent bearing loads on the threads. The

Steel Tension Steel Shear
complete chamfer or end radius of the bolt or screw must extend through the
nut.

AN 310 AN 320

4.  Unique torques specified in the text of this manual supercede the torques
AN 315 AN 364
given in Charts “A” and “B”.
AN 363 NAS 1022

5.  Refer to the latest revision of Lycoming Service Table Limits, SSP1776, for
AN 365 MS 17826
torques on parts used on Lycoming engines.
NAS 1021
MS 20364 to correct for variations in material thickness within the tolerances permitted.

6.  A maximum of two AN960 washers may be added under bolt heads or nuts
MS 17825

7.  Self-Locking Fasteners - Limitations of the use of self-locking nuts, bolts and
MS 21045
screws including fasteners with non-metallic inserts are as follows:
MS 20365
A. Fasteners incorporating self-locking devices shall not be reused if they
MS 20500
can be run-up using only fingers. They may be reused if hand tools are
NAS 679
required to run them up, providing there is no obvious damage to the
self-locking device prior to installation.

Nut-bolt Torque Limits Torque Limits
B.  Bolts 5/16 inch diameter and over with cotter pin holes may be used with
self-locking nuts. Nuts with non-metallic locking devices may be used in

size in-lbs.
in-lbs. this application only if the bolts are free from burrs around the cotter pin hole.
Min.
Max.
Min.
Max.
C.  Do not use self-locking nuts at joints which subject either the nut or bolt
to rotate.

8-32 12 15 7 9
D.  Never tap or rethread self-locking fasteners. Do not use nuts, bolts or
10-24 20 25 12 15
screws with damaged threads or rough ends.
1/4-20 40 50 25
30 5/16-18
80 90 48
55 3/8-16
160 185 95 110
CHART  A
7/16-14 235 255 140 155
BOLT FRICTION DRAG
1/2-13 400 480 240 290
SIZE TORQUE (IN. - LB.)
9/16-12 500 700 300
420 8 (course thread)
5/8-11 700 900 420
540 10
15
3/4-10 1,150 1,600 700 950
18
1/4 30
7/8-9 2,200 3,000 1,300 1,800
5/16 60
1-8 3,700 5,000 2,200 3,000
3/8 80
1-1/8-8 5,500 6,500 3,300 4,000
7/16 100
1-1/4-8 6,500 8,000 4,000 5,000

4B6

CHART 9102.  RECOMMENDED NUT TORQUES (cont.)
FINE THREAD SERIES
BOLTS
BOLTS
BOLTS
Steel Tension
Steel Tension
Aluminum
AN 3 THRU AN 20
MS 20004 THRU MS 20024
AN 3DD THRU AN 20DD
AN 42 THRU AN 49
NAS 144 THRU NAS 158
AN 173DD THRU AN 186DD
AN 73 THRU AN 81
NAS 333 THRU NAS 340
AN 509DD
AN 173 THRU AN 186
NAS 583 THRU NAS 590
AN 525D
MS 20033 THRU MS 20046
NAS 624 THRU NAS 644
MS 27039D
MS 20073
NAS 1303 THRU NAS 1320
MS 24694DD
MS 20074
NAS 172
AN 509 NK9
NAS 174

Steel shear bolt
MS 24694
NAS 517
AN 525 NK525
NAS 464
MS 27039
NUTS
NUTS
NUTS
Steel Tension Steel Shear
Steel Tension Steel Shear
Alum. Tension Alum. Shear
AN 310
AN 320
AN 310
AN 320
AN 365D
AN 320D
AN 315
AN 364
AN 315
AN 364
AN 310D
AN 364D
AN 363
NAS 1022
AN 363
NAS 1022
NAS 1021D
NAS 1022D
AN 365
MS 17826
AN 365
MS 17826
NAS 1021
MS 20364
MS 17825
MS 20364
MS 17825
MS 20365
MS 21045
MS 21045
MS 20365
NAS 1021
　
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