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Home  »  Fastners  »  Inside Fastners

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Inside Fastners

25 Series M5 Short Double Anchor Assembly
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25 Series M5 Short Double Anchor Assembly

Part No: 25-3094

$16.27

25 Series M5 Butt Fastener
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25 Series M5 Butt Fastener

Part No: 25-3369

$22.34

30 Series Bright Anchor Fastener Cam Only
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30 Series Bright Anchor Fastener Cam Only

Part No: 13185

$4.07

30 Series M6 Standard Anchor Fastener Assembly
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30 Series M6 Standard Anchor Fastener Assembly

Part No: 13186

$8.26

40 Series M8 Standard Anchor Fastener Assembly
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40 Series M8 Standard Anchor Fastener Assembly

Part No: 40-3897

$9.49

40 Series M8 Standard Anchor Fastener Assembly
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40 Series M8 Standard Anchor Fastener Assembly

Part No: 40-3362

$14.30

40 Series M8 Standard Anchor Fastener Assembly
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40 Series M8 Standard Anchor Fastener Assembly

Part No: 40-3373

$13.55

40 Series Bright Anchor Fastener Cam Only
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40 Series Bright Anchor Fastener Cam Only

Part No: 40-3361

$7.71

40 Series M8 Short Double Anchor Assembly
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40 Series M8 Short Double Anchor Assembly

Part No: 40-3100

$22.01

40 Series M8 Long Double Anchor Assembly
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40 Series M8 Long Double Anchor Assembly

Part No: 40-3102

$22.88

40 Series M8 Butt Fastener
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40 Series M8 Butt Fastener

Part No: 40-3370

$22.34

Get The Best Inside Fasteners In Australia

When it comes to building with modular aluminium systems, it’s the details that make all the difference. While the sturdy profiles often get all the attention, it’s the inside fasteners - those small but mighty components - that are truly the heroes. They’re the glue that holds everything together, quietly doing the heavy lifting behind the scenes.

At Modular1, we understand that strength, flexibility, and clean design are non-negotiables in any build. And that’s exactly what inside fasteners deliver.

Let’s take a closer look at why they matter, how to choose the right size, and how they compare to other fastening methods like end fasteners and corner connectors.

What Are Inside Fasteners?

Inside fasteners are exactly what they sound like: connectors that sit neatly within the T-slot of your aluminium profile. This means no protruding parts, no bulky add-ons, and no compromises on aesthetics or strength.

They’re ideal for anyone who wants:

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    A clean, smooth exterior

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    High-strength joints

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    Hidden hardware for a more polished look

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    Easy assembly and reconfiguration

Whether you're building a machine guard, workstation, or custom frame, these internal fasteners keep everything tightly secured and looking sharp.

Why Builders Love Inside Fasteners

Let’s get one thing straight - no one likes exposed bolts or clunky brackets. With inside fasteners, you get a sleek, flush finish that doesn’t sacrifice structural integrity.

Here are a few reasons why our customers keep coming back for these components:

Minimalist Design, Maximum Strength

The internal placement of fasteners preserves the outer look of your frame while ensuring maximum load distribution. You won’t see the fastener, but you’ll feel the difference in stability.

Versatile Applications

From workbenches to 3D printer enclosures, inside fasteners adapt to whatever you’re building. They play well with T-nuts, end fasteners, and other hardware options, giving you endless flexibility.

Modular Freedom

Need to move a component later on? No problem. These fasteners make disassembly and reconfiguration a breeze—perfect for agile workspaces or evolving machinery setups.

Types of Inside Fasteners: Which One Is Right for You?

Just like any other critical component, not all fasteners are created equal. We stock a variety of fasteners to suit your project’s unique demands, from light-duty to heavy-load applications.

Here are some common types you’ll find in our range:

Standard Internal Fasteners

These are your go-to for most general-purpose builds. Compact and strong, they fit snugly within the T-slot and can be used in 90° joints or angled configurations.

Anchor Fasteners

Designed for heavier loads, anchor fasteners provide superior grip and are often used in machine frames and industrial applications.

Double Connectors

For situations where two profiles meet at a single point, double connectors offer excellent alignment and hold. Great for corners or multi-profile junctions.

Hidden Corner Connector

Need to join profiles at a 90° angle but want to keep things tidy? A corner connector that fits internally allows you to maintain the clean lines of your build without any visible metal brackets.

Inside Fasteners Sizes: Getting the Fit Just Right

One of the most common questions we get is: “What size inside fastener do I need?”

The answer depends on:

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    The profile series you're using (20, 30, 40, 45 series, etc.)

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    The load your frame will need to support

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    The application—static or dynamic

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    Whether the connection is temporary or permanent

We stock a wide variety of inside fastener sizes to match the most common aluminium extrusion profiles used in the Australian market. If you’re not sure which one you need, our team is just a message away—we’ll help you find the perfect fit for your frame.

Inside vs End Fasteners: Which Should You Use?

This is a classic debate in the modular aluminium world. So let’s break it down:

Inside Fasteners

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    Hidden for a sleek finish

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    More secure in high-vibration environments

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    Allows full use of T-slot channels

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    Slightly more complex to install

End Fasteners

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    Fast to install—ideal for rapid prototyping

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    Visible from the outside (can impact aesthetics)

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    Generally easier to reposition during assembly

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    Better for temporary or adjustable structures

Truth is, there’s no “one size fits all.” Many builders use a mix of both—inside fasteners for critical load-bearing joints, and end fasteners for speed and convenience in less critical areas.

Where T-Nuts Fit Into the Picture

If fasteners are the backbone of your build, T-nuts are the lifeblood.

T-nuts slide into the T-slot of your extrusion and provide threaded anchor points for bolts and fasteners. When used in tandem with inside fasteners, they allow for rock-solid, hidden connections that keep your frame clean and strong.

Different T-nut types (drop-in, roll-in, spring-loaded) offer various advantages depending on your application. And yes, we stock them all—because every great build starts with a solid foundation.

Choosing the Right Combo: Building Smarter with Modular1

Here’s the thing: hardware shouldn’t hold you back. It should open up possibilities.

At Modular1, we’re not just selling fasteners—we’re building better ways to build.

So when you’re choosing between inside fasteners, end fasteners, T-nuts, or corner connectors, think about the bigger picture:

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    Is this a permanent structure or will it need frequent changes?

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    Do you care more about aesthetics or speed of assembly?

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    Will your build be exposed to vibration, heavy loads, or environmental factors?

We’ve designed our product range to work together like a well-oiled machine—giving you ultimate flexibility, security, and peace of mind.

Need Help? We’ve Got You.

Not sure which inside fastener size is right? Confused between a corner connector and a double connector?

We’ve been in this game for a while—and we’ve seen it all. Our support team is made up of real people who know their way around a T-slot. Drop us a line and we’ll help you pick the perfect parts for your next build.

Frequently Asked Questions

Are inside fasteners compatible with local Australian aluminium extrusion brands?

Yes, they are! At Modular1, we ensure our fasteners are compatible with the most commonly used extrusion profiles available in Australia, including those from leading local suppliers. If you’re unsure, just send us your profile specs—we’ll match you up with the right hardware.

Do I need any special tools to install inside fasteners?

Not at all. Most of our fasteners can be installed with standard hand tools like a hex key or Allen wrench. Some fasteners may benefit from a torque wrench for more precise tightening, but there’s nothing overly technical needed.

Will these fasteners hold up in outdoor or coastal environments?

Absolutely. Our inside fasteners are made from corrosion-resistant materials (such as zinc-plated or stainless steel) suitable for Australia’s diverse climate—including coastal regions where salt and moisture can be a concern. For extra durability, opt for stainless options if your project is going outdoors.

Can I order these fasteners in bulk for ongoing projects or contracts?

Yes! We offer bulk ordering and tailored pricing for businesses, contractors, and repeat buyers. Whether you're outfitting a full warehouse, building machine enclosures, or setting up modular displays, we’ve got you covered with volume discounts and reliable stock.