21mm across the flats
COLPHOS-90 is a high grade leaded tin (phosphor)
bronze, the composition and production of which is carefully controlled to
provide a fine grained, single phase wrought alloy of outstanding quality,
strength and machinability.
The tensile properties and corrosion resistance of COLPHOS-90 are similar to
PB102 phosphor bronze but it also offers good fatigue strength, thermal and
electrical conductivity. These properties combined with a free-machinability
rating some 90% that of CZ121 free-cutting brass make it an ideal choice for
COLPHOS-90 provides design and materials engineers, machinists and engravers
with the ability to specify and take full advantage of an outstanding,
cost-effective copper alloy with a remarkable combination of properties.