Length of Square Key Calculator

Length of Key Formula:

\[ l = 1.5 \times d_{shaft} \]

Length of Key:

1. What is Length of Square Key Calculator?

Definition: This calculator determines the appropriate length of a square key based on the diameter of the shaft it will be used with.

Purpose: It helps mechanical engineers and designers select the correct key length for shaft connections in machinery.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ l = 1.5 \times d_{shaft} \]

Where:

\( l \) — Length of key
\( d_{shaft} \) — Diameter of shaft

Explanation: The key length is calculated as 1.5 times the shaft diameter, which is a standard engineering practice.

3. Importance of Key Length Calculation

Details: Proper key length ensures secure connection between shaft and hub, preventing relative rotation while maintaining structural integrity.

4. Using the Calculator

Tips: Enter the shaft diameter. The result includes a ±5% tolerance for manufacturing variations.

5. Frequently Asked Questions (FAQ)

Q1: Why is the key length 1.5 times the shaft diameter?
A: This ratio provides optimal strength and load distribution while maintaining practical dimensions.

Q2: What does the ±5% tolerance mean?
A: The actual key length can vary by 5% from the calculated value to accommodate manufacturing tolerances.

Q3: When would I need a different length ratio?
A: For high-torque applications or special materials, you might need to adjust the ratio based on engineering calculations.

Q4: Does this apply to all key types?
A: This calculator is specifically for square keys. Other key types (Woodruff, saddle, etc.) have different design rules.

Q5: What units should I use?
A: The calculator works with any consistent units (mm, inches, etc.) as long as input and output use the same units.