Question

Which of the following is not true about the axial thickness of screw thread?

(a) Measured in direction perpendicular to the axis of thread

(b) Measured on pitch cylinder

(c) Distance between opposite faces of same thread

(d) Measured at the same thread

The question was asked in semester exam.

Query is from Screw Threads Terminology in chapter Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

Answer 1

Right choice is (a) Measured in direction perpendicular to the axis of thread

To explain I would say: In a screw thread axial thickness is the distance between the opposite faces of the same thread. It is measured on the pitch cylinder and in a direction parallel to the thread axis.