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Secured By Design Framemaster 12 Inch Letterboxes

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Product Information
Fitting Instructions

The City Safe Framemaster 12 inch letterbox is designed with anti-vandal features and has been awarded the ‘Secured by Design’ approval by the association of police officers.

Letterbox Features:

1 Awarded Secured by Design approval by the Association of Police Officers
2 Outward facing brushes create the Anti-Vandal feature as it prevents vandals from placing unwanted items into the cavity
3 Outwards facing brushes also means better draught proofing and makes it easier to post letters through
4 180 degree opening flap means the flap will not snap off when opened too far
5 Matt finished plastic frame conceals any scratches that may be caused by screwdrivers during installation
6 Blind bolts to the exterior of the letterplate prevents the outer frame being unscrewed from the door externally
7 An internal water seal prevents water getting into the door or panel, and stops letters getting wet
8 Ultra-flexible springs can withstand the letterbox flap opening thousands of times without breaking
9 Revolutionary Patent pending self-aligning screw boss makes screwing the inner and outer frames together easy
10 Comes in 2 sleeve thicknesses – 20-40mm for uPVC doors and 40-80mm for wooden and composite doors
11 Conforms to many standards and testing requirements including BS EN 1303:2005
12 Up to a 5 year inland coating guarantee (defined as 25 miles from the coast or 5 miles from a highly populated industrial area) or lifetime coating guarantee on Nanocoast finishes (see below)


Technical Information


Distance between screw holes 280mm
Letterbox length 300mm
Letterbox height 65mm
Frame material Plastic
Cavity hole size 250mm x 39.75mm

Each letterplate comes with both an external and internal flap to protect your home, and is available in 2 different depths (20-40mm for uPVC doors, and 40-80mm for composite and wooden doors).

The cavity hole dimension to drill into your doors in order to fit the Framemaster 12 inch letterplate is 250mm x 39.75mm.

Materials and Guarantee

Finish Material Coating Guarantee Mechanical Guarantee
Gold Anodised Aluminium 5 Years Inland 5 Years 
Silver Anodised Aluminium 5 Years Inland 5 Years 
Polished Silver Aluminium 5 Years Inland 5 Years 
Black Aluminium 5 Years Inland 5 Years 
White Aluminium 5 Years Inland 5 Years 
PVD Gold Stainless Steel LIFETIME 5 Years 
Mirror Polished Stainless Steel LIFETIME 5 Years 
Satin Stainless Stainless Steel LIFETIME 5 Years 

Live Near The Coast?

Products pitting and rusting near the coast is a very common problem due to the salt in the air

If you live near the coast (defined as within 25 miles away) or within 5 miles of a heavily populated industrial area, it is a very common problem for door hardware to pit and rust (usually within 6 months of it being fitted). The high concentration of salt and chemicals in the air corrodes most metals including brass, zinc, zamak, nickel and more.

UAP have developed a range of products developed specifically for the coast - called Nanocoast. These products are made from 316 grade stainless steel, and have been salt spray tested to ASTM B117:2005 for 2000+ hours (the industry standard is 480 hours).

UAP are so confident with the quality of their Nanocoast products that they offer a LIFETIME coating guarantee, meaning that they will not pit or rust no matter where you put them in the country! 

If you require a Nanocoast letterbox, please make sure you select PVD gold, mirror polished or satin stainless finishes above. 

Fitting Instructions

Fitting Your Letterbox

Fitting your new letterbox is easy and in most cases only requires a screwdriver. The letterbox has 2 parts – the exterior part with brushes and the interior part. We have also supplied fixing screws.

1. Take out your existing letterbox by removing the screws on the inside of the door. The letterbox will then slide out, leaving a cavity in the door.

2. Take the interior part and see if it will fit through the existing hole in the door*. If it does then lift the flap and push the interior part through the door and hold it with one hand. With the door open, slide the exterior part into the door cavity and it will slot into the interior part.

3. Line up the two parts of the letterbox perfectly and then use the 2 screws supplied to secure the interior part. Use a screwdriver to tighten it up but do not use power tools to tighten up the screws.

*If the letterbox does not fit through the cavity, then depending on the door material, open the cavity slightly using a saw, sander or Stanley knife.

Cleaning Your Letterbox

Every month, wipe the letterbox over with a moist cloth and remove any dust particles that may have accumulated. Finish off by wiping the letterbox with a lint free cloth.


Letterbox Guarantee

UAP Limited distribute a range of letterplates in a variety of colours and finishes, and in a number of base materials i.e. aluminium, brass, zamak and stainless steel. As they have no control over the aperture that is cut to take the letterplate, and because the consistency of the door/window/panel thickness is not guaranteed to be perfectly uniform, they strongly recommend using a bead of silicone on the rear of the external letterplate half to go all way round the aperture to give extra support to the water seal. Because of the imperfections in the products being fixed to, especially door panels, the only way to guarantee a good water seal is to apply a silicone bead.

We guarantee the door knocker and finish against the following;

Surface Coating

We guarantee that the letterboxes have a 5 year inland coating guarantee (defined as 25 miles from the coast or 5 miles from a highly populated industrial area), expect Nanocoast finishes which have a lifetime coating guarantee subject to;

1. The letterboxes are applied to a door, window frame or door.

2. The letterboxes are fixed correctly with the brushes facing to the outside and are not scratched or damaged at any time during the installation process or thereafter.

3. The letterboxes are cleaned monthly with a moist cloth and not with any form of cleaning agents.

4. No claim will be accepted for any letterbox that is scratched or mutilated or fitted incorrectly.


We guarantee that the letterboxes will not fail mechanically in normal use during the 5 year guarantee period subject to the conditions outlined above.

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