1. What is Core Diameter of Threaded Bolt?

The core diameter of a threaded bolt is defined as the smallest diameter of the thread of the bolt. It represents the minor diameter of the threaded section and is a critical parameter in bolt design and strength calculations.

2. How Does the Calculator Work?

The calculator uses the core diameter formula:

Where:

• \( d_c' \) — Core diameter of threaded bolt (m)
• \( d_b \) — Nominal diameter of threaded bolt (m)

Explanation: The formula provides a simplified calculation where the core diameter is approximately 80% of the nominal diameter for standard threaded bolts.

3. Importance of Core Diameter Calculation

Details: The core diameter is crucial for determining the tensile stress area of the bolt, which is used in strength calculations and bolt selection for various engineering applications.

4. Using the Calculator

Tips: Enter the nominal diameter of the threaded bolt in meters. The value must be positive and greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between nominal diameter and core diameter?
A: Nominal diameter refers to the overall diameter of the bolt, while core diameter is the smallest diameter at the root of the threads.

Q2: Is the 0.8 factor applicable to all bolt types?
A: The 0.8 factor is a general approximation. For precise calculations, refer to specific bolt standards and manufacturer specifications.

Q3: Why is core diameter important in bolt design?
A: Core diameter determines the minimum cross-sectional area of the bolt, which is critical for calculating tensile strength and load-bearing capacity.

Q4: How accurate is this simplified formula?
A: While the formula provides a good approximation, for critical applications, always refer to exact bolt specifications and engineering standards.

Q5: Can this calculator be used for metric and imperial bolts?
A: Yes, as long as consistent units are used (meters for both input and output), the formula applies to both metric and imperial bolt systems.