Trademark Alloys


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 and are enhanced by good fatigue strength and 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 intricate machining.

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.

Related Specifications of COLPHOS 90

  • C54400
  • ASTM B139
  • ASTM B103
  • CuSn4Pb4Zn3

Nominal Composition of COLPHOS 90

Cu rem, Sn 4.0%, Zn 3.0%, Pb 4.0%, P 0.2%

Mechanical Properties of COLPHOS 90

Ultimate Tensile Strength (N/mm²)Proof Stress (N/mm²)Elongation (%)Hardness (HB)
345-450 8-18 

Key Features of COLPHOS 90

  • Exceptional machinability
  • Excellent wear resistance and bearing tolerance
  • Excellent engraving, enamelling, polishing and plating characteristics
  • Very good corrosion resistance

Applications of COLPHOS 90

Offshore & marine | Connector components, pin contacts, electric motor bearings, spring contacts and pinions

Automotive | Camshaft bushes, thrust washers, piston pin bushes, valve guides and bearings

Engraving & enamelling | Name plates, clock, keys, watch and instrument components; decorative and engraving applications where burr-free and intricate detail is required

Other | gears, cams, pinions, sleeves, water meters, shafts, pumps and valve fittings, stems and seats; fasteners, bolts, studs, screws and washers; press tool components; precision valves and pumps; medical instruments

Case Study

Colphos 90: artisan centrepin reels

Columbia Metals – a leading supplier of COLPHOS 90

With decades of experience and a huge range of stock, Columbia Metals is an industry leader in the supply of COLPHOS 90 and other high quality specialist engineering alloys.

To buy or learn more about COLPHOS 90 contact us now, or fill in the enquiry form on the right hand side and we will be in touch shortly.

  Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB  
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