What is the end of a thread that can be called a fine thread? We could also define it in this way. The height is different. In other words, for the two specifications 1 / 2-13 and 1 / 2-20, the first is coarse teeth and the second is fine teeth. Consequently, it is expressed in 1 / 2-13UNC and 1 / 2-20UNF.
Since there are two different thread specifications for the same nominal diameter, how to choose coarse and fine threads?
Coarse
The so -called coarse teeth actually refer to standard threads. The characteristics of coarse wires are strong resistance, good interchangeability and standards to be compared. -The blocking capacity is poor. Coarse films, the wire step is not required, such as M8, M12-6H, M16-7H, etc. are mainly used for coupling.
Fine tooth
The fine teeth are just in contrast and are specified to complete the special use requirements which cannot be met by coarse wires. To self-cut and anti-stretched. On certain precision occasions, the stainless steel screws with fine teeth are more practical for controlling and adjusting with precision.
The drawbacks are that the value of the traction and the resistance are lower than the coarse teeth, and the wires are subject to damage. This can easily damage the screw and the nut at the same time. It is mainly used in the Metric Hydraulic System pipe fittings, mechanical transmission parts, thin walls with insufficient resistance, internal parts with space limitations and trees with self-bloodrier requirements high. When the fine threads are marked, the height must be marked to show the difference between them and the coarse wires.
How to choose coarse teeth and fine teeth
Coarse threads and fine screws are used for tightening purposes. The fine thread has good self-greening performances, so it has a strong anti-vibration and anti-lineage capacity, but due to the shallow depth of the wire, the ability to resist greater tension is worse than that of coarse. When the anti-lineage measures are not taken, the anti-housing effect of fine threads is better than that of coarse teeth. Fine threads have more advantages when used for adjustment. Disadvantages of fine wires: not suitable for use on materials with excessively thick tissues and poor resistance.
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