Thread Height Calculator

Pitch (mm):

Starts:

Thread Height (mm):

The thread height of a screw or bolt refers to the vertical distance from the crest to the root of the thread. Understanding thread height is essential in engineering and manufacturing, especially for designing fasteners and ensuring proper thread engagement.

Formula

The thread height (TH) is calculated using the formula:

TH=PSTH = \frac{P}{S}TH=SP​

where:

  • THTHTH is the thread height (mm)
  • PPP is the pitch (distance between adjacent threads in mm)
  • SSS is the number of starts (the number of independent threads wrapped around the screw or bolt)

How to Use

Using the Thread Height Calculator is straightforward:

  1. Enter the pitch value in millimeters.
  2. Enter the number of starts (threads).
  3. Click the “Calculate” button.
  4. The calculated thread height will be displayed in millimeters.

Example

For example, if a screw has a pitch of 2 mm and 3 starts (3 independent threads), using the calculator:

  1. Enter 2 in the pitch field.
  2. Enter 3 in the starts field.
  3. Click “Calculate.”
  4. The thread height is calculated as 23=0.67\frac{2}{3} = 0.6732​=0.67 mm.

FAQs

  1. What is thread height in screw threads?
    • Thread height is the distance between the crest and the root of the thread on a screw or bolt.
  2. Why is thread height important in fastener design?
    • Thread height affects thread strength, engagement, and the overall performance of fasteners.
  3. How does pitch affect thread height?
    • A smaller pitch results in a larger thread height and vice versa, assuming the number of starts remains constant.
  4. What does the number of starts mean?
    • The number of starts indicates how many independent threads wrap around the screw or bolt.
  5. Is thread height the same as pitch in screw threads?
    • No, thread height and pitch are different dimensions. Pitch is the distance between adjacent threads, while thread height is the vertical distance of the thread itself.
  6. Can thread height vary in different types of screws?
    • Yes, thread height can vary based on the screw type, pitch, and manufacturing specifications.
  7. What is the relationship between thread height and thread depth?
    • Thread height is the distance between the crest and root of the thread, while thread depth is the distance from the crest to the root measured perpendicular to the axis of the screw.
  8. Why is it important to calculate thread height accurately?
    • Accurate calculation ensures proper thread engagement, strength, and performance of screws and bolts in various applications.
  9. How is thread height measured in practice?
    • Thread height can be measured using specialized gauges or by carefully measuring the physical dimensions of the screw threads.
  10. Can thread height affect the thread’s ability to withstand torque?
    • Yes, thread height influences the mechanical strength and torque resistance of screws and bolts.

Conclusion

The Thread Height Calculator simplifies the process of determining the thread height for screws and bolts. By using the provided formula and inputting the pitch and number of starts, engineers and manufacturers can ensure precise design and application of fasteners in various industries. Understanding thread height is crucial for maintaining quality and reliability in mechanical assemblies and constructions.