10/28/2023 0 Comments Npt tap drill size chartNPT Pipe & Fitting Assembly Drawing Symbols To form the seal, the assembly continues with a wrench an additional distance called “Wrench Allowance”. This distance is called “Hand Tight Engagement Length”, and it is usually measured by an “L1 Gauge”. When assembling with “hand force”, the male and female parts of a tapered thread will turn several rotations until the clearance is closed, and a “stop” is reached.
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