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Point Metric size American system Continental system Chinese system American [4] British [1] French [5] German [6] Dutch Character Pinyin Meaning 1 ≈ 0.353 mm: American [a] ...
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Two principal techniques are used to produce seed beads: the wound method and the drawn method. The wound method is the more-traditional technique, is more time-consuming, and is no longer used in modern bead production: in this technique, a chunk of glass known in glassmaking as a gather and composed mainly of silica is heated on an iron bar until molten.
Some glass beads, almost all freshwater pearls and some gemstone beads will have smaller holes and will require the use of wire thinner than 20-gauge. (The largest wire that can go through the beads is generally chosen. Beads and gemstones are much harder than the wire, and will over time saw into the wire; so thicker wire will last longer.)
Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Although the ASME B94.11M twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.
Leaded chip carriers have metal leads wrapped around the edge of the package, in the shape of a letter J. Leadless chip carriers have metal pads on the edges. Chip carrier packages may be made of ceramic or plastic and are usually secured to a printed circuit board by soldering, though sockets can be used for testing.
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