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Measuring Screw Threads - Drain Plug
www.drainplug.co.ukUnified Screw Threads O/D TPI Minor Diameter Thread Size (inch) (mm) written as-1/2" 13 UNC 10.5 1/2 - 13UNC 1/2" 20 UNF 11.5 1/2 - 20UNF 1/2" 24 UNS 11.5 1/2 - 24UNS