Rings lock and seal threaded fasteners
A
Challenge (Europe) product story
Edited by the Engineeringtalk editorial team
Jan 8, 2003
Dubo sealing/locking rings can be used on their own or with a toothed collar ring for especially high loading applications.
Dubo sealing/locking rings from Challenge can be used on their own or with a toothed collar ring for especially high loading applications, for example when using 8.8 and 10.9 bolts.
In addition to having the locking action of a normal lock washer, the elastic distortion, which occurs when the material is subjected to heavy pressure, creates considerable frictional resistance.
Dubo polyamide sealing/locking rings are available for threaded fasteners from M2 to M52 and offer a cheap and simple solution for original equipment manufacturers and installers to permanently retain and seal threaded items.
The shape of the ring is so designed that as the bolt is screwed home the screw thread is gripped both along the internal circumference and in the bolt hole.
This brings into effect additional frictional forces, which make it impossible for the ring to rotate around the bolt.
Other features resulting from the use of this plastics material are the elimination of leakage, protection of the underlying surface, sound deadening, isolation and corrosion resistance.
The Dubo system is applicable to all forms of hex nut or socket screw and the polyamide rings are resistant to all generally encountered chemicals, such as alkalis, petrol, sea water etc.
They are complemented by the Korrex range of insulating bushes and nut caps.
(This was Engineeringtalk's Top Story on 7 January 2003).
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