Thread Restrict or pitch diameter limit is a standard used for classifying the tolerance in the thread pitch diameter for faucets. For imperial, H or L limits are utilised which designate the number of units of 0.0005 inch above or undersized the pitch diameter is from its simple price, respectively. https://types-of-geodesic-dome48147.blogdeazar.com/29508684/5-essential-elements-for-lead-screw-thread-type