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| MIL-T-18232B(AS)
3.1.20.16
SCREWS. - Countersunk type screws shall have a 100 counter-
sunk head. Self-tapping-type screws may be used. Aluminum
alloy screws smaller than size number 4 shall not be used. With the exception of
threaded parts used in high temperature applications, only fine thread parts
shall be used in sizes number 10 and above and only coarse thread parts shall be
used in size number 8 and below. Self-locking-type screws may be used only when
specifically approved by NAVAIR.
3.1.20.17
NUTS. - All nuts, except self-locking nuts and nuts for
machine screws, shall be locked by cotterpins or safety wire.
Shear or other thin types of nuts which have a fewer number of complete threads
than the standard full-height castellated type shall not be used in primary
structures in which the principal bolt loads are tensile or where him tensile
stresses are required in the bolts to maintain tightness or rigidity of the
assembly. For such applications, standard full-height nuts shall be used.
3.1.20.17.1
SELF-LOCKING NUTS. - Self-locking nuts of approved type may
be used.
3.1.20.17.2
SHEET SPRING NUTS. - Sheet spring nuts of approved type may
be used subject to the restrictions of Drawing MS33538.
3.1.20.18
RIVETS. - Rivets shall conform to applicable ANA standard
drawings. Hollow rivets maybe used only where specifically
approved.
3.1,20.18.1
BLIND RIVETS. - Aluminum alloy blind rivets and monel blind
rivets may be used. Design load allowable shall be in
accordance with Handbook MIL-HDBK-5.
3.1.20.18.2
HI-SHEAR RIVETS AND LOCKBOLTS. - Hi-Shear rivets and approved
type lockbolts maybe used subject to approval by NAVAIR.
Other similar shear-type fasteners shall be used only when specifically approved
by NAVAIR.
3.1.20.19
WASHERS. - Washers-used with internal wrenching or other
similar high-strength tensile-type bolts shall be in accord-
ance with Drawing MS20002. Lockwashers may be used. Where nuts and heads of
bolts, or the heads of flathead pins, used in bushed fittings are not enough
larger than the outside diameter of the bushing to prevent shifting of the bushings,
washers of appropriate diameter and thickness shall be provided under the nuts
or heads as required.
3.1.20.20
HINGES (PIANO-TYPE). - Consideration shall be given in the
selection of piano-type hinges to ease maintenance and replace-
ment of the hinge pins. Extreme length hinges shall be avoided or split into
several segments for ease of maintenance and replacement.
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