<https://www.ultrahighvacuum.com/product/silver-plated-bolts-with-plain-stainless-steel-nuts-and-washers-for-joining-two-through-hole-flanges-together-spf150nbws#webpage>
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"CF Nut Bolt & Washers with CF150 Silver Plated Bolts are used to Clamp two flanges together and compress them against the copper gasket creating a vacuum seal for applications involving Baking."
<https://www.ultrahighvacuum.com/product/silver-plated-bolts-with-plain-stainless-steel-nuts-and-washers-for-joining-two-through-hole-flanges-together-spf150nbws>