United States standard dry seal thread

United States standard dry seal thread

[yə′nīd·əd ′stāts ′stan·dərd ′drī ¦sēl ‚thred]
(design engineering)
A modified pipe thread used for pressure-tight connections that are to be assembled without lubricant or sealer in refrigeration pipes, automotive and aircraft fuel-line fittings, and gas and chemical shells.
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