Number of Fish Bolts per km of Track Calculator

Fish Bolts Formula:

\[ N_{fb} = 4 \times N \]

Number of Fish Bolts per km:

1. What is a Fish Bolts Calculator?

Definition: This calculator estimates the number of fish bolts needed per kilometer of railway track based on the number of rails.

Purpose: It helps railway construction and maintenance professionals determine the quantity of fish bolts required for track projects.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ N_{fb} = 4 \times N \]

Where:

\( N_{fb} \) — Number of fish bolts per km
\( N \) — Number of rails per km

Explanation: Each rail connection requires 4 fish bolts to fasten the fish plates that join the rails together.

3. Importance of Fish Bolts Calculation

Details: Proper calculation ensures you have enough fasteners for rail joints, maintaining track integrity and safety.

4. Using the Calculator

Tips: Enter the number of rails per km (typically 154 for standard gauge). The result has a ±5% tolerance for practical applications.

5. Frequently Asked Questions (FAQ)

Q1: Why 4 fish bolts per joint?
A: Standard railway practice uses 4 bolts (2 per side) to securely fasten fish plates at each rail joint.

Q2: What's the typical number of rails per km?
A: For standard gauge (1435mm), it's typically 154 rails per km, but this can vary based on rail length.

Q3: Why the ±5% tolerance?
A: This accounts for variations in rail lengths, extra bolts for maintenance, and potential wastage.

Q4: Does this include bolts for turnouts/switches?
A: No, additional bolts would be needed for special trackwork like turnouts and crossings.

Q5: How do I find the number of rails per km?
A: Divide 1000 meters by the length of each rail (e.g., 1000/12.5 = 80 rails for 12.5m lengths).