Understanding the concept of threaded TPI is essential for the proper selection and use of threads.
TPI not only affects the appearance of the thread, but also has a direct bearing on its performance and range
of application. Accurately grasping the meaning and application of TPI in the engineering design and manufacturing
process can ensure the reliability and efficiency of the threaded connection.
Q: How do convert pitch between TPI and metric threads?
A: Metric pitch (mm) = 25.4/TPI. For example, 20 TPI equals a metric pitch of 1.27 mm.
Q: Why are some thread specifications labeled with both TPI and pitch?
A: This is to facilitate users with different usage habits to quickly understand the thread specifications.
Some users are accustomed to using TPI, while others are more familiar with pitch.
Q: Is there a standard range for TPI values?
A: Yes, common TPI values range from 4 to 80. Coarse threads typically range from 4-40 TPI, while fine threads
can reach 60-80 TPI. The choice depends on the application needs.
