Coarse threads have a larger threadform relative to screw diameter, whereas fine threads have a smaller threadform relative to screw diameter.Ĭall our bolting experts at 88 with any torque questions. The decimal equivalent of the number of threads in an inch.Ĭoarse threads are those with larger pitch (fewer threads per axial distance), and fine threads are those with smaller pitch (more threads per axial distance). Threads are found on screws, nuts, and bolts. Functional diameter is a measure of the ability to assemble the thread.Ī raised, helical rib or ridge around the interior or exterior of a cylindrically shaped object. Specialty fasteners are also available upon request. We sell these various types of bolts in new condition only. The smallest or largest pitch diameter that fits onto a screw or into a nut, including all of the form deviations such as lead, thread angle, taper, and roundness. North American Rail Products can supply the railroad industry with track bolts, hook bolts, hex bolts, oval neck bolts, diamond neck bolts and square bolts. Pitch is also described as the number of threads per inch. Pitch is the distance from the crest of one thread to the next or the distance from one thread groove to the next, measured from crest to crest. But it is easier to specify the components by a single size designation since the bolt and nut are mating components.) In fact, the bolt diameter is a little smaller and the nut diameter a little larger.
But neither the external threads of the bolt nor the internal threads of the nut are exactly.
For example, a bolt and nut may be described as being ½” diameter.
(Nominal diameter is more of a label than a size. The diameter equal to the external diameter of the threads or the overall diameter of the part.
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