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Fastener Inserts Designed for Lightweight Aerospace Materials Reduce Risks, Costs
12/27/2012

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Spiralock 1/4-28 tapped holes are used to mount connections under the aircraft wing (circled in red) on this F-18 Hornet/AIM-120 AMRAAM air-to-air missile. (Source: Spiralock)
Spiralock 1/4-28 tapped holes are used to mount connections under the aircraft wing (circled in red) on this F-18 Hornet/AIM-120 AMRAAM air-to-air missile.
(Source: Spiralock)

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Jerry dycus
User Rank
Gold
Fasteners in composites
Jerry dycus   12/27/2012 10:10:03 AM
NO RATINGS
 

              I'm not sure anything in this article is new as much if not all of it has been known for 50-100 yrs!!

              In composites one doesn't cut threads for either bolts or inserts if one is smart but instead molds them with epoxy, etc in place giving good holding and locking in many cases.  If a sandwiched material one hollows out the foam/etc core and fill it with epoxy to spead the load, then insert the bolt, insert, etc as needed.

              In other plastics drilling a smaller hole then screwing a hot bolt, insert into it  gives the needed strength in many cases.

              If higher loads than the local material can handle glue on a reinforcement piece with the threads built into it.

              As for working loose there are many types of thread lockers out there.

           

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