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

2.  
Ascertain that the bolt and nut threads are clean and dry (unless otherwisespecified by the manufacturers.) to

If the bolt or nut is required be lubricated 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 completechamferorend radius of the bolt or screw must extend through the nut.

in the text of this manual supercede
given in Charts 'A' and'B'.

4.  
Unique torques specified the torques

5.  
Refero the latest revision of Lycoming Service Table Limits, SSP 1776,for torqueson parts used on Lycomingengines.

6.  
A maximum of two AN960 washers may be added under bolt heads or nuts to correct for variations in material thicknesswithinthe tolerances permitted.

7.  
Self-LockingFasteners-Limitations of the use of self-locking nuts, bolts and screws includingfasteners insertsare as follows:

withnon-metallic

A.  Fastenersincorporatingself-lockingdevicesshall not be reused if theycan be run-up usingonly fingers. Theymay be reused if hand tools are requiredto required to run them up providing there is no obviousdamage device prior to installation.
tothe self-locking

B.  Bolts5/16 inch diameter and over with cotterpin holes may be used with self-locking nuts. Nuts with non-metallic lockingdevicesmaybe used in this applicationonlyif the bolts are free from burrs around the cotter pin hole.
C.  Do not use self-lockingnuts at joints which subject either the nut or bolt to rotate.
D.  Nevertap or rethread self-lockingfasteners.Donot use nuts, bolts orscrewswithdamagedthreadsor rough ends.
CHARTA

BOLT
SIZE

8 (course thread)
10
1/4 5/16 3/8 7/16
FRICTIONDRAG
TORQUE(IN. -LB.)

15
18 30 60 80
100
CHART B
COARSE THREAD SERIES
BOLTS
Steel Tension

AN 3 THROUGH AN 20
AN 42 THROUGH AN 49
AN 73 THROUGH AN 81
AN 173 THROUGH AN 186
MS 20033 THROUGH MS 20046
MS 20073
MS 20074
AN 509 NK9
MS 24694
AN 525 NK525
MS 27039
NUTS
Steel Tension  Steel Shear 
AN 310  AN 320 
AN 315  AN 364 
AN 363  NAS 1022 
AN 365  MS 17826 
NAS 1021  MS 20364 
MS 17825 
MS 21045 
MS20365 
MS 20500 
NAS 679 

Nut-bolt  Torque Limits  Torque Limits 
size  in-lbs.  in-lbs. 
Min.  Max.  Min.  Max. 
8-32  12  15  7  9 
10-24  20  25  12  15 
1/4-20 5/16-18  40 80  50 90  25 48  30 55 
3/8-16  160  185  95  110 
7/16-14  235  255  140  155 
1/2-13  400  480  240  290 
9/16-12 5/8-11 3/4-10 7/8-9 1-8  500 700 1,150 2,200 3,700  700 900 1,600 3,000 5,000  300 420 700 1,300 2,200  420 540 950 1,800 3,000 
1-1/8-8 1-1/4-8  5,500 6,500  6,500 8,000  3,300 4,000  4,000 5,000 

EFFECTIVITY:
040-999

PAGE
16 91-00-00
Jan 10/90
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

E. TorqueRequirements(continued)
CHART 7 RECOMMENDEDNUT TORQUES (Sheet 2 of 2)
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 NAS144 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 THRUMS 20046 NAS 624 THRU NAS 644 MS 27039D MS 20073 NAS 1303 THRU NAS 1320 MS 24694DD MS 20074 NAS 172 AN 509 NK9 NAS174 Steelshearbolt MS 24694 NAS 517 AN 525 NK525
NAS 464
MS 27039

NUTS NUTS NUTS Steel Tension Steel Shear Steel Tension SteelShear Alum. Tension Alum. Shear
AN 310 AN 320 AN 310 AN 320 AN 365D AN 320D AN 315 AN 364 AN315 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
MS 20500 NAS 679

NAS 679 NAS 1291
Nut-bolt Torque Limits Torque Limits TorqueLimits TorqueLimits TorqueLimits TorqueLimits size in-lbs. in-lbs. in-lbs. in-lbs. in-lbs. in-lbs.
Min. Max. Min. Max Min. Max. Min. Max. Min. Max. Min. Max.
8-36 12 15 7 9 5 10 3 6
　
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