Clearance between Shaft and Stuffing Box if Shaft Diameter is ≤100mm Calculator

Clearance Formula:

\[ c = 0.2 \times d_{shaft} + 5 \]

Clearance (mm):

1. What is Shaft to Stuffing Box Clearance Calculator?

Definition: This calculator determines the recommended clearance between a shaft and its stuffing box when the shaft diameter is 100mm or less.

Purpose: It helps mechanical engineers and maintenance professionals establish proper clearances to prevent shaft damage during packing operation.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ c = 0.2 \times d_{shaft} + 5 \]

Where:

\( c \) — Clearance between shaft and stuffing box (mm)
\( d_{shaft} \) — Diameter of the shaft (mm) (must be ≤100mm)

Note: The result has a ±5% tolerance to account for manufacturing variations.

3. Importance of Proper Clearance

Details: Correct clearance prevents excessive wear on shafts while maintaining effective sealing. Too little clearance causes packing to overheat the shaft; too much leads to leakage.

4. Using the Calculator

Tips: Enter the shaft diameter in mm (must be 100mm or less). The calculator will automatically compute the recommended clearance with ±5% tolerance.

5. Frequently Asked Questions (FAQ)

Q1: Why is this formula limited to shafts ≤100mm?
A: Larger shafts require different clearance calculations as the relationship isn't linear at larger diameters.

Q2: What does the ±5% represent?
A: It accounts for manufacturing tolerances and variations in packing material compression.

Q3: How critical is this clearance?
A: Extremely critical - improper clearance is a leading cause of premature shaft failure in packed pumps and valves.

Q4: Does this apply to all packing materials?
A: The formula works for most conventional packing materials; exotic materials may require adjustments.

Q5: What if my shaft diameter exceeds 100mm?
A: Use our "Shaft Clearance Calculator for Diameters >100mm" tool instead.