Sea Sure 25mm High Load Black Ceramic
Ball Bearing Double Block with Shackle
A key feature of the Black range is the use
of Ceramic Ball Bearings. Ceramic Ball Bearings are lighter, stronger
and faster than stainless balls. A ceramic ball is also around 3-4 times
harder than its equivalent in stainless meaning that the expected life
is also 3-4 times that of a stainless ball. The surface of the ceramic
ball is non porous meaning it will produce 50% more RPM than a stainless
Another key feature is the striking colour.
The black titanium plasma coating infuses itself into the stainless,
meaning that it is extremely hard wearing. This is the first block of
its kind and one that will certainly stand out on a boat.
The Sea Sure Black Vapour Deposited coatings
are extremely hard (typically 3 to 4 times harder than tool steel), have
a low coefficient of friction and are extremely wear resistant.
The TiN (Titanium Nitride) coating thickness
is in the range 2 to 5 microns.
These coatings are traditionally applied to
high speed steel or cemented carbide tools and dies to improve tool life.
As well as preventing galling (of stainless
steels for example) they provide a highly scratch and tarnish resistant
black colour coating for use in extreme conditions.