KORREX BUSHES PROVIDE MORE
THAN JUST INSULATION
fastener suppliers, Challenge (Europe) Ltd, now offer
the Korrex range of insulating bushes to complement their range of
threaded fasteners. These bushes are engineered to provide a solution to
the problems of galvanic (electrolytic) corrosion. Where two incompatible
metals are in contact, such as aluminium and steel, the presence of
moisture (electrolyte) can create significant problems. The Korrex bush is
purpose designed to prevent this phenomenon by mechanical separation while
retaining integrity of the joint.
typical situation can occur, for example, where two metal plates are being
clamped together using a nut and bolt. The Korrex insulating bush acts by
separating the bolt from the surrounding material. In so doing it also
provides an element of sealing, which may be enhanced by the inclusion of
a Dubo ring – also available from Challenge. The insulating bush has the
additional advantage of reducing problems associated with vibration, and
can also act as a guide or spacer.
Korrex insulating bushes are available in a range of metric and imperial sizes from M4 to M20, or ¼” to 1”. They are manufactured from superpolyamide, and can withstand temperatures within the range –60ºC to +120ºC. They come in two forms – counter-sunk for a flush or sub-flush finish, and shouldered for use with surface mounted fasteners.