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58BW ST HI Slimline Windows

AluK 58BW ST HI aluminium windows are the perfect choice for replacing original steel windows. They are designed to tastefully replicate the appearance of classic steel windows with all the benefits of modern high performing aluminium. Their minimal sightlines and choice of profile finishes makes them ideal for both residential and commercial installations.

  • Window energy rating A – B
  • 24mm – 32mm glazing thickness
  • Polyamide thermal breaks
  • Integrated deep head profile
  • Dual colour options
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Product features

Design features

58BW ST HI slimline windows combine the classic sleek look of steel windows with modern aluminium frames. They can be specified as top hung, bottom hung, side hung, fixed light, or multi light configuration. And they are available in a selection of aesthetic finishes including putty line, stepped edge, square, exterior glazed, and chamfered. All slimline aluminium windows feature an outward opening functionality.

Product options

  • Window energy rating A - B
  • 65mm sightlines
  • Bay, contemporary, and heritage aesthetics
  • Class 4 air tightness
  • Class 9A water tightness
  • PAS 24 security tested
  • Multiple configurations available
  • U-values as low as 1.2 W/m²K (triple glazing)
  • U-values as low as 1.4 W/m²K (double glazing)


Top hung (maximum weight)

Side hung (maximum weight)

Bottom hung (maximum weight)

Fixed light (maximum weight)

Frame depth

Glazing thickness

Sightlines (frame to vent)

Sightlines (vent to mullion)

Sightlines (fixed light)

Size and weight limits



60kg (three hinges)


58mm to 70mm

24mm to 32mm






Steel-look aluminium windows for the classic Crittal effect

Many heritage building renovation projects require specific types of window styles. In lots of commercial buildings in particular, steel Crittal windows were often an integral part of the original property’s architectural style. AluK 58BW ST HI aluminium windows are designed to faithfully replicate the classic appearance of steel Crittal windows. They help to recreate the original sleek design with all the benefits of a high performing aluminium window system. Suitable for both residential and commercial installations, they are a great addition to your product range.

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Frequently Asked Questions

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What are your lead times?

Lead times can vary per product. For stock PVCu colours we work to a 10-15 working day schedule. For more up to date lead times on any specific product e-mail us at where we will be happy to help.

Are your products compliant with new building regulations?

Our Eurocell PVCu range of products are fully compatible with all new build regulations. Quantum Windows has a number of secured by design certifications to provide you with peace of mind and our quality systems in place are all aimed at producing a quality product first time, every time.

Currently, our range of Aluminium double glazed Aluk 58BW HI Windows, Aluk 58BD HI Residential doors, EdgeGLIDE+ Sliding door and Unifold HI all have a U-value of 1.4 or below and are compliant with new building regulations. Our range of compliant products is always growing, so please give us a call for the most up to date information.

Please note that you will need to specify on your enquiry if you need your product to meet the new building regulations.

Where do you deliver to?

We deliver weekly to the West Midlands, Derbyshire, Leicestershire, Warwickshire, Oxfordshire, Berkshire, Surrey, West Sussex, East Sussex, Kent, Greater London, Hertfordshire, Essex, Suffolk, Cambridgeshire, Bedfordshire, Buckinghamshire. Norfolk and of course Northamptonshire.

aspects white open bi fold doors

I have been buying windows and doors from Quantum Windows for over 25 years. I have always found the pricing very competitive and the quality has been very high. On the rare occasion a problem has arisen it has been dealt with swiftly and efficiently. The office staff are always polite, friendly and professional and we have built a strong relationship over the last 25 years. The drivers are excellent. I know them very well and they have adapted to my ways of working and are always willing to help and accommodated me.

Craig Gutteridge

“We have dealt with Quantum Windows for 13 plus years, we find the staff to be courteous and polite and any queries we may have are dealt with promptly and efficiently, nothing is too much trouble”

Jackie - Accounts Dept

W R Enterprise Glass & Glazing Ltd.

We have been buying from Quantum Windows for almost 30 years now, they offer a wide product range and the Team have excellent product knowledge which is invaluable in an ever-changing market.

All team members are friendly, helpful and efficient, orders are processed with care and quotations provided promptly. I would have no hesitation in recommending Quantum Windows.

Vicki Webb

Clearview 2000 LTD

‘We have used Quantum Windows for many years now, we have always found them to be very easy to work with, the staff are all very helpful and friendly, they are always available to offer any help should we need it, excellent product!’


Chapel Windows

Glevum and Quantum have enjoyed an excellent working relationship for a number of years, working together to provide a high quality, value for money product offering and service for the end user.

As well as delivering a high quality product, the knowledge and experience of the staff at Quantum is invaluable to a customer in a market where Building Regulations are constantly changing.

Mike Donaldson

Glevum Design & Build

As installers of both PVCu and Aluminium to the New Build market, the importance of on time delivery is totally time critical.
Over the last 20 years Quantum windows have worked closely with PGB to partner with us and deliver our offer to site.
Highly professional, and a pleasure to have worked with them so closely over the years.

Phil Martin CEO

Portico CB Ltd

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