1. What is Torque Distribution on Bolt Groups?

Torque distribution on bolt groups refers to how a moment or torque load is distributed among multiple bolts in a connection. This calculation is essential for ensuring that no single bolt is overloaded in a bolted joint assembly.

2. How Does the Calculator Work?

The calculator uses the simple uniform load formula:

Where:

• \( T \) — Torque per bolt (Nm)
• \( M \) — Total moment applied to the bolt group (Nm)
• \( n \) — Number of bolts in the group

Explanation: This formula assumes a uniform distribution of load across all bolts in the group, which is valid for symmetrical bolt patterns under pure moment loading.

3. Importance of Proper Torque Distribution

Details: Proper torque distribution is critical for maintaining joint integrity, preventing bolt failure, and ensuring the safety and reliability of mechanical connections in structures and machinery.

4. Using the Calculator

Tips: Enter the total moment applied to the bolt group in Newton-meters (Nm) and the number of bolts in the group. All values must be valid (moment > 0, number of bolts ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: When is the uniform distribution assumption valid?
A: The uniform distribution assumption is valid for symmetrical bolt patterns where all bolts are equidistant from the center of rotation and the load is applied purely as a moment.

Q2: What if my bolt pattern is not symmetrical?
A: For non-symmetrical patterns, more complex calculations considering the distance of each bolt from the center of rotation are required.

Q3: Does this calculator account for preload?
A: No, this calculator assumes all bolts share the load equally and does not account for variations in bolt preload or stiffness.

Q4: What safety factors should I consider?
A: Always apply appropriate safety factors based on your application, material properties, and industry standards when designing bolted connections.

Q5: Can I use this for dynamic or impact loads?
A: This calculator is designed for static loading conditions. For dynamic or impact loads, additional considerations for fatigue and shock loading are necessary.