Introduction

Taking on an owner-builder project is no small task — and getting the details right matters.

One of the most overlooked areas is choosing the right bolts and fasteners. It might seem minor, but the wrong choice can lead to:

• Structural issues
• Failed inspections
• Costly rework

This guide breaks it down simply, so you can confidently choose the right bolts for your build.

What bolts should an owner builder use?

Owner builders should use structural bolts for load-bearing applications and high tensile bolts for general construction, ensuring all fasteners meet Australian standards where required.

Where Bolts Are Used in Your Build

Bolts are used across multiple stages of a build:

• Structural steel connections
• Timber framing
• Decking and outdoor structures
• Brackets and supports

? Each application requires a different type of bolt

Structural vs General Bolts (Simple Explanation)

Structural Bolts

Used for:

• Steel frames
• Load-bearing connections
• Critical structural components

These must meet standards like AS/NZS 1252.

? Read our full Structural Bolts Guide – Standards, Types, Installation & Specifications - KonnectDirect

High Tensile Bolts

Used for:

• General construction
• Brackets and supports
• Machinery or fixtures

? Learn more in High Tensile vs Structural Bolts: What’s the Difference (and When to Use Each) - KonnectDirect

Choosing the Right Bolt (Simple Breakdown)

Use Structural Bolts When:

• The connection supports weight
• Engineering drawings specify it
• You’re working with steel

Use High Tensile Bolts When:

• The load is non-critical
• You’re working with general fixtures
• Flexibility is needed

Common Owner Builder Mistakes

1. Using the Wrong Bolt Type

Not all bolts are interchangeable.

2. Ignoring Standards

If your build requires compliance, you must follow it.

3. Going Too Cheap

Low-quality fasteners can compromise the entire build.

4. Not Checking Bolt Grades

? Read: Bolt Grades Explained: 8.8 vs 10.9 vs 12.9 | Strength Guide AU - KonnectDirect

How to Stay Compliant (Australia)

To avoid issues during inspections:

• Follow engineering specifications
• Use certified products
• Confirm standards like AS/NZS requirements
• Keep documentation

? This is especially important for structural elements

Pro Tips for Owner Builders

• Always double-check specifications
• Buy from reputable suppliers
• When unsure — ask before installing
• Don’t mix bolt types in structural areas

Frequently Asked Questions

Do I need structural bolts for my build?

Yes, for any load-bearing or structural connections.

Can I use high tensile bolts instead?

Only for non-structural applications unless specified.

What happens if I use the wrong bolts?

You risk failed inspections, safety issues, and costly rework.

Where should I buy bolts for my build?

From trusted suppliers who provide compliant, high-quality fasteners.  We have a huge range of fasteners available, at the right price.  

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