Question

Difference between coarse and fine thread

Answer 1

Coarse Threads

Coarse threads are more strong and have more prominent protection from stripping and cross-threading. The stature of each string is more noteworthy than the comparing fine thread so there is more material between each string making flank engagement more prominent.

Fine Threads

Finely threaded jolts are more grounded than the comparing coarse threaded electrical discharges same hardness. This is in both tension and shear because of the finely threaded bolts having a marginally bigger malleable pressure zone and minor diameter.

Answer 2

Coarse threads, also represented as UNC/UNRC, are used where the situation demands rapid dismantling, disassembly, or assembling. The cross-threading probability is less and the start is much easier. They have higher pitch value i.e, fewer threads are present at per axial distance. It is used for making threads that make use of low tensile materials like cast iron, steel, alloys of soft copper, aluminium, etc. It is used for making a majority of nuts, screws, and bolts.

Fine threads - are used for applications which need a high tensile strength than that of which are needed for the coarse threads. Fine threads are almost 10% stronger than the coarse threads.They have a lower pitch, which makes them to loosen up easily due to high vibrations. They need larger tap drill when compared to the coarse threads, which in turn improves the performance qualities of the drill and the tap. They have a less tapping torque and also, less breakage.