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4 Inch fasteners General information Difference of flank angle between UNC America and BSW England UNC American Standardcoarse thread 60º flank angle BSW English Standardcoarse thread 55º flank angle Distinction from the English inch thread Not only the metric and imperial thread types are different Inch fasteners can be found not only in the USA but also in England In addition to American threads there is another type of inch thread in England – the English standard coarse thread „BSW“ The western difference to the American coarse thread lies in the flank angle which differs as follows American threads The most important thread types in the Anglo-Saxon world are the American standard coarse thread UNC and the standard fine thread UNF which are regulated in the standard ASME B1 1 The most important difference between the metric and the American threads is in the definition of the thread In the metric range the pitch of the thread e g M8 x 1 25 mm is described and in the American range the number of threads per one inch 25 4 mm is indicated The number of threads defines the number of the thread turns in the length of every inch UNF Unified National Fine Thread Series American Standardcoarse thread For example Designation ¾ – 16 UNC x 1 UNC Unified National Coarse Thread Series American Standardcoarse thread For example Designation ¾ – 10 UNC x 1 Thread diameter Number of threads to 1 Length Thread diameter Number of threads to 1 Length