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WebDec 1, 2024 · The following specification covers requirements for finishes used on Worldwide Standard and Utility Parts. Obsolete finish specifications are not shown in this standard. If a finish is referenced that is not shown in this standard, the user should contact the local Fastener Engineering Office for direction. WebJul 31, 2024 · The pH values of the passivate bath generally range between 3.0 and 4.0 for a clear bluish finish and between 2.0 and 2.5 to produce a black finish. The passivate processes recommended for zinc-nickel are thin-film formulations. Asterion acid zinc system with a trivalent passivate and an organic seal used on threaded fasteners. buy windposts online
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