Bolt diameter looks simple until an RFQ, drawing, and actual part do not match. A buyer may write \u201cM12 bolt,\u201d but the supplier still needs to know the standard, thread pitch, shank style, tolerance, and whether the bolt is fully threaded or partially threaded.<\/p>\n\n\n\n
For industrial purchasing, diameter is not one number. It is a set of related dimensions.<\/p>\n\n\n\n
| Termine<\/th> | Significato<\/th> | Perch\u00e9 \u00e8 importante<\/th><\/tr><\/thead> |
|---|---|---|
| Dimensione nominale<\/td> | The named bolt size, such as M12 or 1\/2 inch<\/td> | Used for RFQs, catalogs, and standard selection<\/td><\/tr> |
| Shank size<\/td> | The unthreaded body diameter under the head<\/td> | Affects fit through holes and shear area<\/td><\/tr> |
| Dimensione della filettatura<\/td> | The thread diameter and pitch, such as M12 x 1.75 or 1\/2-13 UNC<\/td> | Controls nut fit, thread engagement, and compatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Per gli articoli comuni del catalogo, gli acquirenti possono esaminarli elementi di fissaggio standard<\/a> e confermare lo standard esatto prima di ordinare.<\/p>\n\n\n\n For metric bolts, \u201cM12\u201d means the nominal thread diameter is 12 mm. The actual outside diameter of the thread is usually slightly below 12 mm because of manufacturing tolerances.<\/p>\n\n\n\n A typical metric callout may be:<\/p>\n\n\n\n |