Length of Rectangular Key Calculator

Length of Key Formula:

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

Length of Key: m

1. What is Length of Rectangular Key Calculator?

Definition: This calculator determines the appropriate length of a rectangular key based on the diameter of the shaft it will secure.

Purpose: It helps mechanical engineers and designers select the correct key size to prevent rotation of machine components on shafts.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

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

Note: The result has a tolerance of ±5% to account for manufacturing variations and practical fitting requirements.

3. Importance of Key Length Calculation

Details: Proper key length ensures secure connection between shaft and hub, prevents slippage, and maintains power transmission efficiency.

4. Using the Calculator

Tips: Enter the shaft diameter in meters. The result will be calculated with ±5% tolerance. All values must be > 0.

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 installation requirements.

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

Q3: When would I need a different length ratio?
A: For high-torque applications or special materials, consult engineering standards for modified ratios.

Q4: How do I measure shaft diameter accurately?
A: Use precision calipers or micrometers to measure the shaft diameter at multiple points.

Q5: Does this calculator work for all key types?
A: This specifically calculates for rectangular keys. Other key types (Woodruff, Gib-head) require different calculations.