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1.1/16-12 JIC HEX HEAD PLUG-UP-500-12 — Custom Fittings
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Aceteel 1 11/16"-16 UN Tap and Die Set, 1-11/16 x 16 UN Right Hand HSS Machine Thread Tap and 1-11/16 x 16 UN Alloy Tool Steel Round Die : Amazon.co.uk: DIY & Tools
Thread Chart (UNF-UNC) | Major and Minor Diameters