Spherical Preforms

Coining Spheres
Coining spheres are precise, spherically shaped parts formed from specially alloyed materials. They often are used as jointing components instead of more conventional flat preforms when either: 1) the part geometries surrounding the preform are better joined using a spherical shape rather than a flat shape, or 2) the alloys involved are not capable of being stamped into a flat shape.

Features

• Accurate diameters

• Bright and shiny surface finishes

• Highly spherical shapes

• With or without flux

• Made from pure metal, combined to produce exact alloy compositions

Typical Alloys
The alloys most commonly requested by Coining customers are listed below. Please contact us for other available alloys. Purities are typically 99.99%. Higher purities may be available upon request.

	Melting Point (C)	Melting Point (C)	Melting Point (C)
	Eutectic	Solidus	Liquidus
52In-48Sn	118
58In-42Sn	138
95.5Sn-4Ag-0.5Cu		217	219
95.5Sn-4Ag-0.5Cu		217	220
96.5Sn-3.5Ag	221
85Sn-15Ag		221	345
99.3Sn-0.7Cu	227
90Sn-10Cu		227	450
65Sn-25Ag-10Sb		230	273
Sn	232
95Pb-5Sb		235	240
87.5Sn-12.5Sb		240	267
80Au-20Sn	278
95Bi-5Sb		282	312
88Au-12Ge	356
97Au-3Si	370
72Ag-28Cu	779
Ag	961
Au	1063

Typical Diameters
Coining can easily manufacture spheres in diameters ranging from 0.001" (0.025mm) to 0.080" (2.0mm). Tolerances by weight are typically +/- 5%. Please contact us for specifics and availability of other sizes.

Packaging
Various packaging options are available based on customer needs. Non-contact desiccant is used as required. An inert argon atmosphere is available on request.