Pitch is the distance between screw grooves and is commonly applied with inch-sized merchandise and specified as threads for every inch. Lead is definitely the linear vacation the nut can make for each just one screw revolution and it is how ball screws are generally specified. The JIS screwdriver is https://typesofroofrepair15925.wssblogs.com/29396697/facts-about-types-of-screwdriver-heads-names-revealed