Archive for January 2020

Case Study: Should I choose Zinc or Stainless Steel Handles?

31st January 2020

Zinc handles have been fitted for years to patio doors, with manufacturers thinking that zinc doesn’t corrode.

However an increasing number of door manufacturers and indeed homeowners are now coming to us asking why their zinc handles are corroding, as you can see in the case study video.

The answer is in the base metal. Diecast zinc is very different to zinc galvanising and corrodes quickly because of its composition of multiple elements. As soon as the powder coated surface finish on the handle becomes scratched or damaged, the diecast zinc base metal soon pitts and corrodes.

Why does stainless steel not corrode?

Stainless steel’s corrosion resistance is a result of a very thin film oxide layer on the steel’s surface. This is formed by the alloying agents in the stainless steel, such as chromium and molybdenum, mixing with the oxygen in the water or air to form this thin but stable film of metal oxide. Stainless steel must have at least 10.5% chromium for the passive layer to form. The more chromium and molybdenum that is added, the more stable the passive layer becomes, and the better the corrosion resistance. Note that Molybdenum is only found in 316 Stainless Steel, not 314 Stainless Steel. The Molybdenum is what helps resist corrosion from chlorides such as saline (salt) air or acidic timber.

Our range of blu 316 marine grade stainless steel hardware contains 16 to 18% Chromium and 2 to 3% Molybdenum.

Therefore fitting our blu range of 316 marine grade stainless steel hardware, with their lifetime guarantee will keep your doors and windows looking good, and your customers happy, for years to come.

Zinc Patio Handles Zinc Patio Handles

Zinc handles

BLU Stainless Steel Patio Handles BLU Stainless Steel Patio Handles

blu 316 Stainless Steel Handles

Three reasons why customers are fitting our KM9 Series Patio Handle to their sliding doors:

  1. Adding value – customers have reported being able to increase their margin, for the same sliding door, after switching to fit the blu KM9 series Patio Handle.

  2. They won’t corrode – made from 316 stainless steel to prevent corrosion and supplied with a Lifetime Guarantee for that extra customer ‘peace of mind’

  3. Strength and Durability – the solid 316 stainless steel backplate provides added strength and durability even for larger leaf sliding doors

So, should you choose handles made from zinc or stainless steel for your front doors, patio doors, windows?

Well if you want a handle that isn’t going to corrode but is going to stay looking and performing great for years to come then it needs to be from our blu stainless steel range.

As the homeowner said after her new blu handles were fitted “Thank you for coming round and for fitting the new handles we are so happy with them”.

You can view the range of BLU 316 Stainless Steel Hardware by clicking on this link.

Contact our team of hardware specialists on [email protected] or 01726 871 025 for more information on how we can help improve the longevity of your doors and windows.

How to reduce overhead costs with less site callbacks

21st January 2020

With labour such a big percentage of overheads, why not look to reduce your site callbacks?

Have you ever considered how much a site callback visit costs you in terms of labour? Labour costs are a huge proportion of overheads, so it makes sense to review issues that cause site callbacks. Reducing site callbacks will help keep your labour focussed on what makes you your money.

We hear of many instances where fitters are called back to site to resolve issues with the hardware installed. In most instances this could have been prevented by fitting hardware which was fit for purpose.

Window Espagnolette bolts, Tilt and Turn Systems and Multipoint Door Lock System made from passivated silver can often corrode and fail within a short space of time of being installed. This is especially so when in corrosive environments such while the building is still being constructed, in buildings on or near the coast, or in acidic timber.

Yet for minimal cost you can quickly and easily upgrade to the range of MACO TRICOAT for which Coastal are the main distributors. MACO TRICOAT has been specially developed to provide the ultimate in enhanced corrosion protection, performance and durability for your Doors, Windows and Tilt & Turn Systems - adding value to your doors and windows.


MACO TRICOAT hardware features:

  • 10 Year Surface Guarantee even in corrosive environments
  • Durable, self-healing coating which is extremely resistant to scratching
  • Matt finish providing a premium look and feel

MACO TRICOAT Window Espagnolette Bolts featuring:

  • Same machining detail as silver version for quick changeover of production line
  • Secured by Design Approved
  • No cropping or extensions required making fabrication fast and simple

MACO TRICOAT Window Espag Bolt from Coastal

Click to view the MACO TRICOAT Window Espagnolette Bolt range


MACO TRICOAT Tilt and Turn Juliet Balcony System featuring:

  • Slimmer profiles
  • High security full perimeter locking
  • Up to 180kg max weight and 1400mm W x 2600mm H
    max size per sash

Click to view the MACO TRICOAT Tilt and Turn range

MACO TRICOAT Multipoint Door Locks featuring:

  • Protective sleeves which release chemicals to neutralise salt air/acid and prevent the gearboxes from corroding
  • PAS24 approved locking systems
  • Tapered hook bolts for easy locking operation

Click to view the MACO TRICOAT Multipoint Door Lock range


Choose MACO TRICOAT as your ‘fit and forget’ range of door and window locks. You’ll not only benefit from a reduction in your site callbacks, but also an increase in your profits.

To discuss in more detail how we can use our door and window expertise to help you, contact us on [email protected] or 01726 871 025.