Effective Thread Length Calculator

Formula

The formula to calculate the effective thread length (L_e) is:

\[ L_e = L_n - H_h - T_r \]

Where:

Effective Thread Length: The portion of a fastener’s length that is fully threaded and capable of engaging with a corresponding threaded hole or nut. It is crucial for ensuring the fastener can provide the necessary clamping force and load-bearing capacity.

Let's say the nominal length of the fastener (L_n) is 50 mm, the head height (H_h) is 5 mm, and the thread runout (T_r) is 2 mm. Using the formula:

\[ L_e = 50 - 5 - 2 \]

We get:

\[ L_e = 43 \, \text{mm} \]

So, the effective thread length is 43 mm.

Formula: \( \text{Effective Diameter} = \frac{\text{Major Diameter} + \text{Minor Diameter}}{2} \)

Example: \( \text{Effective Diameter} = \frac{10 + 8}{2} \)

Formula: \( \text{Minimum Thread Length} = \text{Diameter} \times 2 \)

Example: \( \text{Minimum Thread Length} = 5 \times 2 \)

Formula: \( \text{Number of Threads} = \frac{\text{Length}}{\text{Pitch}} \)

Example: \( \text{Number of Threads} = \frac{50}{2} \)