Yale Postmaster 12 Inch Aluminium Letterbox

Yale 12" Postmaster Letter Box – Heavy Duty Aluminium Letterplate for uPVC & Wooden Doors

Metal letter box engineered to withstand the harshest British weather whilst maintaining A4 post delivery.

Yale 12" Postmaster Letter Box represents the gold standard in residential door furniture, combining Yale's legendary build quality with advanced weather protection technology. This premium aluminium letter plate delivers exceptional durability and performance, making it the definitive choice for homeowners seeking a permanent replacement for draughty, corroded, or underperforming letterboxes on uPVC, composite, or wooden doors.

Constructed from with concealed spring mechanisms, this letterplate has been rigorously tested to the highest weather severity ratings. The sophisticated triple seal weather protection system – featuring internal nylon brush seals, compression foam seals, and external cell foam seals – creates a barrier against wind, rain, and heat loss, effectively functioning as a high-performance draught excluder that delivers measurable energy savings whilst eliminating those telltale whistling draughts that plague inferior letter boxes.

Key Benefits:

• Triple Seal Weather Protection System – Engineered with three distinct sealing layers (nylon brush seal internally, compression foam seal, and external cell foam weather seal) to eliminate draughts, prevent water ingress, and significantly reduce heat loss through your door. Tested to the highest weather severity rating to withstand extreme British conditions year-round.
• Full A4 Aperture Compliance – Generous aperture opening meets BS2911 standards, ensuring effortless delivery of A4 envelopes, magazines, small parcels, and catalogues without jamming or damage. Eliminates the frustration of bent post and missed deliveries caused by undersized letter boxes.
• Premium Metal-Aluminium Construction – Unlike plastic alternatives that crack, discolour, and deteriorate within years, this heavy-duty aluminium frame and flaps resist corrosion, UV degradation, and impact damage. Maintains pristine appearance and smooth operation for decades, even in coastal environments with salt spray exposure.
• Concealed Steel Spring Mechanism – Quality hidden steel springs ensure both flaps return smoothly and silently to the closed position every time, preventing annoying rattling in windy conditions whilst maintaining weather seal integrity. No exposed springs to rust or fail like economy models.
• Universal Door Compatibility (40-80mm) – Innovative internal ABS Plastics telescopic sleeve design adjusts to fit door thicknesses from 40mm to 80mm, making this letter box suitable for modern uPVC doors, traditional wooden doors, timber doors without additional modifications. Ideal replacement for worn letterboxes across all door types and materials.
• 130° Flap Opening Angle – Wide-opening flaps (130° arc) facilitate easy post delivery for postal workers whilst preventing obstruction from internal draught excluders or catches. Reduces wear on spring mechanisms and extends service life compared to restricted-opening designs.
• Security Through-Fix Installation – Supplied with through-fix screws and concealed screw inserts that prevent external tampering or removal. Security fixings deter letter box fishing attempts and unauthorised access, providing peace of mind alongside weather protection.
• Multiple Premium Finishes Available – Choose from White, Polished Chrome, Polished Gold, Satin Silver, or Black to perfectly complement your door furniture and architectural style. Each finish is applied to exacting standards with excellent UV and corrosion resistance.
• Yale Brand Reliability – Backed by Yale's 180-year heritage in security and door hardware excellence. This letter box delivers the same engineering precision and quality control that has made Yale the most trusted name in home security and hardware worldwide.
• Simple Direct Replacement Installation – Designed as a straightforward upgrade for existing 12" letter boxes with standard 277.5mm screw hole centres. Perfect for replacing old, draughty, or damaged letterboxes on uPVC doors and wooden doors. Most installations require only a screwdriver and 15 minutes, with minor aperture adjustments easily achieved using a standard hacksaw if required.

Product Specifications:

• Brand: Yale
• Model: 12" Postmaster Letter Box
• Material: Heavy duty aluminium frame and flaps with concealed steel springs
• External Dimensions: 303mm (W) × 70mm (H)
• Internal Aperture (Sleeve Size): 258.5mm (W) × 40.5mm (H)
• Screw Hole Centres: 277.5mm
• Door Thickness Compatibility: 40mm to 80mm (telescopic sleeve adjustment)
• Flap Opening Angle: 130 degrees
• Weather Protection: Triple seal system (nylon brush seal, compression foam seal, cell foam external seal)
• Standard Compliance: BS2911 A4 aperture standard
• Weather Severity Rating: Tested to highest classification
• Available Finishes: White, Polished Chrome, Polished Gold, Satin Silver, Black
• Fixing Method: Through-fix security screws with concealed inserts

Important Measurement Note: Before ordering, remove your existing letter box and measure the exact aperture (hole) dimensions in your door. The internal sleeve size (258.5mm × 40.5mm) represents the minimum hole size required. Door apertures can be enlarged slightly using a hacksaw if needed, but cannot be reduced. Also measure your door thickness at the mid-rail to confirm it falls within the 40-80mm range.

Pro Tips:

Pro Tip: When fitting this letter box, apply a thin bead of silicone sealant around the external frame perimeter before securing it to your door. This creates an additional moisture barrier and prevents water tracking behind the frame during driving rain – particularly important on exposed front doors. Allow the silicone to cure fully (24 hours) before testing the seals.

Package Contents:

• 1 × Yale 12" Postmaster Aluminium Letter Box (complete assembly with internal and external flaps)
• 1 × Set of ABS Plastic telescopic internal sleeves (pre-fitted, adjustable 40-80mm)
• 1 × Set of through-fix security screws with concealed screw inserts

Frequently Asked Questions:

Will this letter box fit my door that's 70mm thick?
Yes, absolutely. The Yale Postmaster features internal telescopic sleeves that adjust to fit any door thickness between 40mm and 80mm, making it compatible with modern composite doors (typically 44-70mm). Simply extend the internal sleeve to match your specific door thickness during installation.

How do I know if this will fit my existing letter box aperture?
Remove your current letter box and measure the hole dimensions in your door. This Yale letter box requires a minimum aperture of 258.5mm wide × 40.5mm high (the internal sleeve size). If your existing hole is slightly smaller, you can carefully enlarge it using a hacksaw or jigsaw. If it's larger, that's fine – the external frame (303mm × 70mm) should cover the opening. The screw hole centres should be 277.5mm apart, but minor adjustments are possible during installation.

Is this letter box draughtproof, and will it help reduce heating bills in winter?
Yes, this is one of the draught-resistant letter boxes available for home door security and weather protection. The triple seal weather protection system (nylon brush seal on the inside, compression foam seal, and cell foam seal on the external flap) has been tested to the highest weather severity rating. Customers typically notice an immediate reduction in cold draughts and whistling sounds through the letterbox. While actual heating bill savings depend on your home's overall insulation, eliminating this common heat loss point contributes meaningfully to improved energy efficiency, particularly in exposed properties. This letterbox effectively functions as a built-in draught excluder for your front door.

What's the difference between this aluminium letter box and cheaper plastic versions?
The difference is substantial in both durability and performance. Aluminium construction offers superior corrosion resistance (essential in coastal areas or properties with garden sprinkler exposure), maintains dimensional stability in temperature extremes (plastic warps and distorts), provides better security against forced entry or letter box fishing, and maintains its appearance for decades without discolouration or brittleness. The concealed steel springs are vastly more reliable than plastic spring mechanisms that frequently fail. Whilst the initial investment is higher, the Yale Postmaster typically outlasts three or four plastic letter boxes, making it more cost-effective long-term.

Can I install this myself, or do I need a professional?
This is an excellent DIY project for anyone with basic tool skills. Installation typically takes 15-30 minutes and requires only a screwdriver (and possibly a drill if creating new screw holes). The through-fix design means you simply position the letter box, mark the screw positions, drill pilot holes if needed, and secure with the supplied fixings. The most important step is accurate measurement beforehand, remove your existing letter box, measure the aperture and door thickness, and verify compatibility before ordering. The included measurement guide provides detailed dimensions and technical diagrams to ensure proper fitment.

Why Choose Yale 12" Postmaster Letter Box?

When you invest in a Yale letter box, you're not just replacing a worn-out component – you're installing engineered hardware that represents 180 years of manufacturing excellence and innovation in home security and door furniture. This Postmaster model embodies Yale's unwavering commitment to quality, combining premium materials, rigorous testing standards, and thoughtful design features that budget manufacturers simply cannot replicate at lower price points.