25th November 2019

fastenal
12

What is the thread engagement?

The axial distance through which the fully formed threads of both the nut and bolt are in contact is called the length of thread engagement. The depth of thread engagement is the distance the threads overlap in a radial direction.

Similarly one may ask, what are the different types of threads?

There are six types of threads commonly used on hydraulic tube fittings:
  • UN/UNF.
  • NPT/NPTF.
  • BSPP (BSP, Parallel)
  • BSPT (BSP, Tapered)
  • Metric Parallel.
  • Metric Tapered.

What does thread size mean?

The "8" refers to the size (diameter) of the screw, and the "32" means it has 32 threads to the inch. The diameter is measured at the shank of the screw. Screws are sized by gauge number and length. For example, an 8 gauge screw with 32 threads per inch and 1" in length would be written as: 8-32 X 1".

What does chase threads mean?

A die is used to cut or form the male portion of the mating pair (e.g. a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading. Both tools can be used to clean up a thread, which is called chasing.
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