Thread Restrict or pitch diameter Restrict is a typical useful for classifying the tolerance of the thread pitch diameter for faucets. For imperial, H or L boundaries are utilized which designate what number of units of 0.0005 inch over or undersized the pitch diameter is from its basic value, respectively. https://reidanhtf.blog-a-story.com/9468478/considerations-to-know-about-types-of-screw-heads-torx