# Bolt Property

This section defines bolt specifications for field splice and gusset plate connections.

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**Navigation:** Properties > Bolt Property

For detailed parameter explanations, see the [Bolt Property Reference](https://docs.openbrim.org/templates/steel-i-girder-bridge-workflow/properties-sig/bolt-property-sig).
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## Steps

### Step 1: Navigate to Bolt Property

Navigate to **Properties > Bolt Property** in the tree view.

### Step 2: Create Flange Bolt Property

Click the first cell under **Name** and enter **BoltFla**.

![Bolt Name](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160904.png?api=v2)

### Step 3: Set Bolt Diameter

Click the **three-dots icon** on the **Bolt Diameter** cell and set the diameter to **0.875 in**.

![Bolt Diameter](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160921.png?api=v2)

### Step 4: Set Nut Diameter

Enter the **Diameter of the Nut** as **1 in**.

![Nut Diameter](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160939.png?api=v2)

### Step 5: Configure Mechanical Properties

Keep the **Mechanical Properties** as default (A325 bolts).

![Mechanical Properties](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160958.png?api=v2)

### Step 6: Configure Visual Settings

Keep the **Visual Settings** as default.

![Visual Settings](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-161009.png?api=v2)

### Step 7: Create Additional Bolt Properties

Create two additional bolt properties:

| Name       | Bolt Diameter | Nut Diameter | Usage              |
| ---------- | ------------- | ------------ | ------------------ |
| BoltWeb    | 0.875 in      | 1.4375 in    | Web splice bolts   |
| BoltGusset | 1.0 in        | 1.4375 in    | Gusset plate bolts |

<details>

<summary><strong>Quick Tip:</strong> Bolt Standards</summary>

* **A325** bolts are high-strength structural bolts commonly used for slip-critical connections
* The **Slip Coefficient** (Class B) assumes clean mill scale surfaces
* **Faying Surface Condition** affects the slip resistance of the connection

</details>

## Verification

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After completing these steps, the bolt properties should match the views shown below.
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![Bolt Property Overview](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250114-103352.png?api=v2)

![Geometric Properties](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160801.png?api=v2)

![Mechanical Properties](https://openbrim.atlassian.net/wiki/download/attachments/2123399631/image-20250113-160820.png?api=v2)

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To view the entire procedure explained on this page, please watch the recorded video below.
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{% embed url="<https://openbrim.atlassian.net/wiki/download/attachments/2123399631/bolt%20properties.mp4?api=v2>" %}
Bolt Properties
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