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The Tappex Anti-creep spacers are designed for either mould-in
or post mould installation into cored holes, both in thermoset
and thermoplastic mouldings to provide reinforced clearance
holes for bolts to pass through.
The high compressive load from tightening is taken by the
fastener rather than the plastic, which would otherwise relax
with time, thus loosening the tightened joint. Conventional
metal to metal tightening torques can therefore be applied
to the joint. |
Design Aids
- On long bosses, if moulding distortion occurs thus altering
the distance between the hole centres, increase the draft
angle on the clearance section of the moulded hole to provide
adjustment.
- Flanged hexagon headed bolts are the preferred fastener
to use with the Anti-Creep Spacers. Note; the bearing diameter
under the head of the bolt or washer must be greater than
the outside diameter of the spacer to effectively secure
the component. The direction of coring should preferably
ensure the bolt enters the spacer from the reduced diameter
end of the moulded hole.
- The axial retention of the spacer will vary dependent
upon the size and the plastic around it, but can be assumed
to be between 500N and 1500N ( ie 097M 8-06-12 gives 1000N
in unfilled polypropylene)
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