The cylinder sleeves for our Cool Jugs cylinder assemblies are
manufactured from through hardened 4140 steel starting from
a raw forging.
Each sleeve is precision machined using the latest CNC lathe
equipment. The cylinder bore is then left untreated and simply
honed for those customers that want a plain steel finish or
for a more long lasting finish we offer a proprietary, corrosion
resistant nickel-carbide plating process that provides excellent
Finished sleeves are then mated with the cylinder head/coolant
jackets by screwing the two components together. An interference
fit between the cylinder head/coolant jacket and the cylinder
sleeve assures a positive seal, excellent thermal conductivity
and a solid assembly.