---
title: "Bolt Tensile Stress Area Calculations"
slug: "bolt-tensile-stress-area-calcs"
tags: ["FCM"]
updated: 2026-10-27T23:12:05Z
published: 2026-10-27T23:12:05Z
canonical: "ims-handbook.cenosco.com/bolt-tensile-stress-area-calcs"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bolt Tensile Stress Area Calculations

For imperial: $A = \frac{\pi}{4} \left(D -\frac{0.9743}{n}\right)^2$

Bolt tensile stress area calculations:

| Symbol | Name | UoM | Source |
| --- | --- | --- | --- |
| A | Bolt tensile stress area | in2 | Calculated. |
| D | Bolt nominal diameter | in | LOOKUP (based on Flange SIZE and CLASS RATING). See [Stud Size Lookup](/v414/docs/stud-size-lookup). |
| n | number of threads per inch - TPI |  | LOOKUP (based on Flange SIZE). See [TPI Lookup (based on Stud Size)](/v414/docs/tpi-lookup-based-on-stud-size). |

Note: Users can also directly enter a Bolt Tensile Stress Area. This user-entered value will then also be the value used in the Torque and Tensions calculations.

Example:

Determining the tensile stress area of a bolt for a mechanical assembly if:

Stud Size (D): 1.25 inches

Number of Threads: 7

${\Large A = \frac{\pi}{4} \left(1.25 - \frac{0.9743}{7}\right)^2 = 0.9691 \text{ in}^2 = 6.25 \text{ cm}^2 }$