Belleville Fasteners - DIN 6796
Purpose:
Belleville Fasteners DIN 6796 give permanent pressure to the
union between a screw and a nut to  prevent the loss of pre-load on
it; achieveing in this way a static fix regardless of vibrations
and other relaxations which might appear with time.
 These are only useful
to protect from axial loads.
Belleville Fasteners DIN 6796 are made to be static. Their
use in dynamic applications is not recommended.
In the following table we can contrast values for the residual
elastic force, which can only be used as a reference for users of
Fastener Bellevilles. It shows the lowest limit of residual
elastic force to hold unions through Belleville Fasteners.
These values are only aproximate never to be taken as exact.
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Materials
Belleville Fasteners DIN 6796 are available in C60 (DIN
17221 and DIN 17222) hardness range between 420 and 510 HV. Made of
this material they can have different finishes: Oiled; Phosphating
+ Oiled; Mechanical Zinc Plating.
Fastener Bellevilles DIN 6796 are also available with other
materials: Stainless Steel range: X12 Cr Ni 177 (AISI 301)
and X7 Cr Ni Al 17-7 (AISI 631). Most common sizes for DIN
6796 can be supplied in Niquel alloys (NICr 19 NbMo) material known
as Inconel 718 to be used where a high resistance to
corrosion is required or temperature is excesive for conventional
materials. Residual elastic forces for this materials will be
slightly lower to the previously shown due to a lower elasticity
they have.
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