When can I return my item?

Returns are accepted within 30 days of the original purchase date.

How do I get the item back to you for a refund?

It is your responsibility to get the item/s back to us for any consideration of a return or refund. All items returned are required to be accompanied with the original sales order number or a copy of your paperwork to facilitate the process.

Do you charge a restocking fee?

No restocking fees are charged on items held on our shelf

How will I get my refund?

Refunds are offered only on the items purchase – if items or packaging is damaged or components are missing, part refunds may be offered (this is at the discretion of management). No refunds are offered on the original postage charged, only on stock returned undamaged. Refunds are processed back via the original purchase method.

Can I return a special order in item?

Special order items DO NOT attract an automatic return or refund – as they have been special ordered in. We are governed by the supplier of the special-order stock to see if they will offer a return or refund. Many will not offer refunds; many will charge restocking fees. For consideration of a return of a special-order item, you would be best to approach the Mr Windows team before shipping the item back to us.

The leading reseller and manufacturer of obsolete sliding window parts, shower parts and sliding door parts in Australia with over 4000 different products to choose from! We offer quality products at competitive prices; with friendlier customer service than many other distributors out there. Trade Customers & Business Customers can expect great volume pricing so you can get big orders going, and get that competitive edge. For all things Windows, Sliding Door Parts & Showers, we're here with the solution.

Do You Repair Doors, Windows or Showers?

Sadly we do not perform maintenance or repairs ourselves anymore. We have decided to focus on parts and hardware while giving any enquiries for repairs or maintenance to trusted, local trades people.

Are Sliding Glass Door Rollers Universal?

The answer is generally no, whilst there are some rollers that can be used in various brands. Most door rollers are designed for the specific manufacture and series of door, so they are not universal or generally interchangeable. If you are not sure what brand of door you have, check out our resources section, in their you will find the sliding door decal guide this shows the most common decals or motifs that are used by the major brands in the center of their glass door panels. Once you identify the brand you can then search on our site. If you are still unsure, then send us a PDF or JPeg image of your door roller carriage, no need to remove it leave it in the door panel and send this photo to us and the team will do the rest to assist you in your search.

What Is The Hardware On A Door Called?

Furniture generally refers to the handle and the components therein in its entirety. Lever Handles are exactly as they sound. Typically not found on sliding doors, they use a lever action to open, close and lock. Mortice Lock is found inside of the extrusion. The lock body is hidden away inside the door itself.

What Is Dummy Door Hardware?

Dummy Hardware refers to the Sliding Door Handle or Furniture that has no locking mechanism. Often used on the internal of a door.

What Are Door Knob Screws Called?

These screws are often referred to as Grub Screws or Set Screws.

How experienced is your team to help me?

Over 50 Years Of Experience. We are capable of identifying and troubleshooting Window Parts, Sliding Door Parts & Shower Parts dating back as far as the 1960's. With a culture and ethos fostered and focused around restoration and repair before entire replacement, you can be certain we will find a solution for you that is cheaper than a new window, sliding door or shower.

February 16, 2026

Window Anatomy Explained | A Practical Guide to Window Parts & Hardware

Why Understanding Window Anatomy Matters

If you’ve ever tried to replace a window lock, roller, or seal, you’ll know how confusing it can be when everything looks similar but fits differently. That’s where understanding window anatomy really helps.

Knowing the correct names and functions of window parts allows you to:

Identify worn or faulty hardware
Order the correct replacement parts the first time
Communicate clearly when asking for help
Repair existing windows instead of replacing them entirely

This guide focuses on parts and hardware, not windows themselves because often, a small part makes a big difference.

Window Parts Explained

Head (Frame)

The head is the top horizontal section of the window frame. It forms the upper track that guides the sliding panel as it moves. In many sliding windows, the head also houses safety components such as anti-lift blocks or stops, which prevent the sash from being lifted out unintentionally.

Jamb

The jambs are the vertical sides of the window frame. They help guide the sliding panel and often contain hardware such as locks, keepers, or guides. Proper alignment of the jambs is essential for smooth sliding and effective locking.

Sill

The sill is the bottom horizontal part of the window frame. It supports the weight of the window panels and contains the lower track where rollers run. The sill also plays an important role in water drainage, helping direct moisture away from the window system.

Sliding Panel

The sliding panel (also known as the sliding sash) is the movable part of the window. This is the panel you open and close. It typically contains:

This panel is commonly removed when replacing rollers, handles, or seals.

Sliding Glass Panel

The sliding glass panel refers to the glass secured within the sliding panel frame. The glass itself doesn’t move independently, it’s held in place by glazing beads and seals, which help improve insulation, reduce noise, and keep the glass secure.

Fixed Panel

The fixed panel is the stationary side of the window. It does not move but still plays a key role in sealing and security. Fixed panels rely on proper sealing and alignment with the sliding panel to prevent drafts and water entry.

Interlock Mullion

The interlock mullion is the vertical section where the sliding panel overlaps with the fixed panel when the window is closed. This component improves:

Security
Weather resistance
Structural stability

Most window locks engage with or around the interlock mullion to secure the window.

Lock

The lock secures the sliding panel to the fixed panel or frame. Locks can be keyed or non-keyed and vary by window system and profile. A correctly matched lock ensures the window closes smoothly and stays secure.

Looking for replacement window locks or handles? Browse our window hardware range or send us a photo of your part and we’ll help identify the right match.

Why This Knowledge Saves Time & Money

Understanding window anatomy helps you:

Replace individual parts instead of entire windows
Avoid ordering incorrect hardware
Extend the life of existing window systems
Make smarter DIY repair decisions

Often, what feels like a major issue comes down to a worn roller, tired seal, or damaged lock, all of which are replaceable.

Need Help Identifying a Window Part?

If you’re unsure what part you need, you’re not alone. window hardware can look very similar across systems.

Send us a clear photo of your window part and our team can help identify a suitable replacement.

Frequently Asked Questions (FAQ)

What are the main parts of a sliding window?

The main parts include the frame (head, jambs, sill), sliding panel, fixed panel, glass, rollers, locks, seals, and interlock mullion.

What is a window sash?

A window sash is the movable panel that holds the glass and slides within the window frame.

Can window hardware be replaced without replacing the window?

Yes. Most window issues can be resolved by replacing individual parts such as rollers, locks, handles, or seals.

Why is the interlock mullion important?

The interlock mullion improves security and weather sealing by overlapping the sliding and fixed panels when the window is closed.

How do I know which window part I need?

Identifying the location of the issue and providing photos and measurements helps ensure the correct replacement part is selected.

1 comment

Kathrine Driver June 5, 2026

Old sliding aluminium windows at my holiday house need the rubber/vynal? glass stop/glass bead replacing as it has perished. Maybe 1960/70’s era. Looks like a little plastic T.

Is it possible to get this.