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| button socket head cap screw |
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| What are the most common threads used for nuts and bolts where easy assembly is required and are in general use by plumbers |
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| national coarse threads (nc) |
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| this thread is interchangeable with nc and nf threads and will no doubt even trually replace them |
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| unified national coarse and unified national fine threads |
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| what kind of screw thread in which the threads must assemble easily and where an allowance is required to permit ready assembly even when the threads are slighty bruised or dirty |
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what kind of fit designates a high quality commercial screw-thread product and is recommended for the major portion of interchangeble screw0thread work, forfinished and semi finished nuts andbolts and for machine screws , where no allowance is required
(all nuts and bolds for general-purpose use are this class) |
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| what kind of screw is the same as class 2 but the tolerances are smaller. it is inteded to apply to interchangeable screw-thread work requiring the smallest practial tolerances. |
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| the lenghth of a bolt is measured from witch 2 points |
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| under the head to the end |
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