In the US most tooling suppliers carry a variety of brass and stainles
steel balls. Bronze can be found but is quite a bit more expensive. The stainless come in a variety of grades including machinable grades. Most of the low cost ones are +/- 0.0002 inch tolerance. Both th brass and stainless cost about US$15 for a package of 25 in 7/1 diameter size. I have seen metric balls also, but they are not commo in the US. I would guess the UK tooling suppliers would have them fo similar prices. For reference go to
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and search fo brass balls.
Gai
-- GailInN
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