precious metal wireJohnson Matthey produces many different precious metal wires and their alloys in a range of diameters to suit your needs. The purest grade wire is made to your specification in our modern factories in Royston near Cambridge in the UK, and at West Chester near Philadelphia in the USA. Precious Metal Wire is delivered in coils, straight lengths, cropped pins or on a wide range of reels. Precise hardnesses, tensile properties, elongations or resistances can be specified at the time of order if required.

Through our expertise in precious metal wire drawing techniques and diamond die maintenance, we are also able to tightly control the wire diameter (measured by resistance) and eliminate contamination (typical resistance tolerance at ultrafine wire sizes is +/- 3%). Laser micrometers are used to guarantee that wire diameters are reliably maintained. Our metallurgical expertise and fine-wire process controls ensure consistent metallic grain structure in all rod, wire and ribbon for reliable tensile strength and exceptional repeatability. There are numerous alloys available with established production routes compiled by Johnson Matthey over many years. Our team of metallurgists can provide technical support and recommendations on the suitability of different precious metal wires for your application.

Johnson Matthey also offers a wide range of Nitinol Wire, in addition to our Precious Metal Wire, Rod & Ribbon.

Wire Specifications Available Sizes
Diameters 0.001" (0.0254mm) to 0.125" (3.175mm)
Cut Lengths 0.02" (0.508mm) or greater
Tolerances in accordance with ASTM A-555

 

Wire Size Variations
Specific Size (in Inches) Variation (over) Variations (under)
Under .100 to 0.044

.001

.001

Under .044 to 0.033 inclusive

.0008

.0008

Under .033 to .024 inclusive .0005 .0005
Under .024 to .012 inclusive .0004 .0004
Under .012 to .008 inclusive .0003 .0003
Under .008 to .0048 inclusive .0002 .0001
Under .0048 .0001 .0001

(The above specifications are references not limits)

Standard Spool Types
Spool* Flange Dia. Barrel Dia. Width Arbor Hole
Type 1 3 1/2" 1 1/2" 2 3/16" 2 1/8"
Shaw 4 5/8" 4" 5/8" 3/8"
Type 2 4 1/2" 2 1/2" 2 15/16" 5/8"
White 4 7/8" 3" 3 1/2" 5/8"
Gauze 2 1/2" 1 3/4" 3" 5/8"
Hubbard 11 2/4" 8 1/4" 3 9/16" 2"
Type 3 6" 2 1/4" 3" 5/8"
Little White 2 1/4" 1 3/4" 1" 5/8"

NOTE: Customer-supplied spools can generally be handled on request

*JM internal nomenclature, not actual spool types

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