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Figure 2-31.  Teeth-Type Lockwashers

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TM 1-1500-204-23-6 NOTE Care should be taken to prevent dissimilar metal corrosion. When a self-locking feature cannot be provided in externally or internally threaded part. When  a  cotter  pin  cannot  be  used  to  prevent  rotation  of  an  internally  threaded  part  with  respect  to  an externally threaded part When lockwire cannot be used to prevent loosening of threaded parts. When fastening is not used for fabrication of primary structure. When loosening of threaded parts would not endanger the safety of aircraft to personnel When   corrosion,   encouraged   by   gouging   of   aluminum   or   magnesium   alloys   by   edges   of   teeth   on MS325333,  MS35335,  MS35336,  and  MS35790  washers,  would  not  cause  malfunctioning  of  parts  being fastened  together.    Corrosion  of  dissimilar  metals  may  be  reduced  by  installing  MS35333,  MS35335, MS35336, and MS35790 washers wet with primer, MIL-P-23377. Figure 2-31.  Teeth-Type Lockwashers c.   High Tensile Special Washers.  Taper pin, high tensile, countersunk, and preload indicating special washers are identified in figures 2-32 through 2-35. (1) Taper pin washers.    Use  a  taper  pin  or  dished  washer,  AN975,  in  conjunction  with  threaded  taper  pin, AN386 install washer under nut AN320 to effect adjustment where a plain washer would cause distortion. (2) High  tensile  washers. Use  a  high  tensile  washer,  MS20002,  in  conjunction  with  high  tensile  internal wrenching bolts, MS2004 through MS20018.  A Type C washer is countersunk to seat the bolt head shank radius, and a plain type washer is used under the nut Plain and countersunk washers, MS20002 and MS20002C, are heat-treated to 125,000 to 145,000 psi. (3) High  Tensile  Countersunk  washers. Countersunk  washers,  commonly  called  dimpled  washers,  are  for use with 100-degree flat-head screws, or rivets, to provide reinforced, low-profile attachments in such locations as fillets and  other  fairing  installations.  Identify  countersunk  washers  by  part  number.    Examples:  A3236-0.012  (No.    6  screw), A31350-0 017 (No.  8 screw), A3235-0.020 (No.  10 screw). CAUTION Damage    to    preload    indicating    washer    may    occur    if    the    nut    is overtightened Figure 2-32.  Taper Pin Washer 2-36

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