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R  incorrect. 
R  - You apply the tightening torque incorrectly: 
R  This can change the tightening torque and, thus, the 
R  preload. 
R  NOTE : If you use a screwdriver, you must tighten at the____ 
R  correct speed to prevent too much heat on the 
R  fasteners. This can cause damage to the protection and 
R  the lubricant and can make the fastener seize. 
R  - The attachment of the component is correct: 
R  Make sure that the component is attached correctly before 
R  you apply the maximum torque. 
R  3_  You get a correct part mating for a good fatigue of the
R  joints. 
R  (c) Do not apply more than the maximum torque value. 
R  (d) Make sure that you get correct part mating before the maximum 
R  torque value is applied. 
R  (e) Tightening of screws and nuts with a torque wrench and an 
R  adapter. 
R  (Ref. Fig. 201/TASK 20-21-11-991-020) 
R  1_  When you can only tighten with an adapter, obey these
R  instructions: 
R  a_  Adjust the adapter until the center of the hexagonal socket
R  or the jaws is aligned with the axis of the torque wrench. 
R  The angle of offset must not be more than 15 degrees.

 

R R  Torque Wrench/Adapter Combination Figure 201/TASK 20-21-11-991-020
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 b To prevent possible errors, the length of the adapter must
_ be less than the length of the torque wrench.
 c When you use an adapter, the value shown on the dial of the
_ torque wrench is not the applied value. To get the correct
 value T2, apply this formula:
 T1 x A
 T2 = ------
A + B
 T1: Value that you must apply on the nut.
 A : Length of the torque wrench.

 B : Length of the adapter T2: Torque wrench dial reading

 NOTE : This formula is correct only when the torque wrench
____ and the adapter are aligned.
 4. Procedure
_________
 Subtask 20-21-11-911-050
 A. Tightening Torque for the Screws and the Nuts.
 (1)
 Tightening by the nut. (Ref. Fig. 202/TASK 20-21-11-991-001, 203/TASK 20-21-11-991-003)

 -If you cannot tighten by the nut, increase by 20% the values given in the figures.

 (2)
 Tightening by the screw (captive nut). (Ref. Fig. 204/TASK 20-21-11-991-022) You can tighten by the screw only when the screw is installed in a hole with clearance fit.

 (3)
 Tightening of castellated nuts. If the torque values tolerance does not let you put a slot opposite a hole for a cotter pin, you can:

 -Decrease the minimum torque by 10 %.

 -Install a washer below the nut,

 -Replace the nut.
 You can drill the screw during the installation.
 Make sure that you do not decrease the strength of the screw
 (Specially for offset drilling, the diameter of the bore must be
 correct, deburr lightly).
 You must prevent corrosion (Put grease in the hole of the nut when
 you install steel bolts).

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R R  Torque Values for Removable Structural Fasteners Figure 202/TASK 20-21-11-991-001
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 INTENTIONALLY BLANK

R 1 1
20-21-11Page 207
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R  Torque Values for Equipment Installation Fasteners Figure 203/TASK 20-21-11-991-003- 12 (SHEET 1)
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R  Torque Values for Equipment Installation Fasteners Figure 203/TASK 20-21-11-991-003- 22 (SHEET 2)
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R  Torque Values for Equipment Installation Fasteners Figure 204/TASK 20-21-11-991-022
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 NOTE : We recommend that you use screws with their initial drill
____
 holes.

 (4) Installation of self-locking nuts.
 (Ref. Fig. 205/TASK 20-21-11-991-034)

 (a) Procedure for the installation of self-locking nuts (ASNA 2028 -R ASNA 2528), (ASNA 2029 - 2529), (ASNA 2031 - 2531), (ASNA 2032 -R 2532), (ASNA 2036 - ASNA 2536), (ASNA 2037 - ASNA 2537) and (ASNA
 2038 - ASNA 2538) with interfay sealant. When the fasteners (screws/nuts) are installed on uncured interfay sealant, the fasteners can loose their preload after curing because the sealant does not flow immediately. This is why you must tighten them again. The first tightening is got when the outer hexagonal part is sheared off. You must apply the torque values specified in the given procedure (Ref. SRM 514900).
　
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