SD4 Security & Blast Doors

SD4 Security Doors are designed to protect medium to high-risk properties from experienced attempts at forced entry, regardless of noise, using heavy hand and battery tools or explosives.

Door Leaf and Door Frame

The door leaf is robust at 55mm thickness, crafted from 2mm corrosion resistant Zintec/Aluzinc sheets, offering various custom finishes. It’s filled with mineral wool and integral steel stiffeners for strength. The blade comprises two 2mm sheets bonded to form 4mm steel armour around a sturdy core, featuring a flush anti-jemmy astragal. The frame, made from folded and welded 2mm Zintec/Aluzinc, includes a welded, variable sub-frame for site tolerance (-0/+30mm) and an Anti-Crush plate. It boasts four Class 13 stainless steel dog bolt hinges, recessed and modified to prevent pin extraction. Two solid ball round dog bolts enhance resistance, and mineral wool infill provides insulation and structural support.

Threshold and Finishes

The threshold options include a standard 15mm rebated threshold and an optional 12.5mm 564A Aluminium threshold, which is DDA compliant. As for finishes, you can choose from the standard Polyester Powder coating from the Standard Colour Range, opt for Polyester Powder Coating from the non-standard colour range, or select the unfinished option for on-site finishing. Additionally, the door sizes are custom manufactured in 10mm increments, accommodating single openings ranging from 690mm to 1390mm and double openings from 1290mm to 2600mm, with heights up to 2900mm.

Secure Locking

The door features a secure locking system, including a centre High Security WAAA1100 Sashlock combined with two similar Deadlocks positioned in the upper and lower quarters of the door. All locks are equipped with anti-jemmy escutcheons and welded shrouds to enhance security. These locks are designed to be anti-drill and pattern protected, significantly reducing the risk of unauthorised key duplication. For alternative locking options, you can opt for Mico and Surelock systems, and the doors are also outfitted with Exidor tower bolts. In situations requiring fire escapes, high-security multi-point heavy-duty panic hardware is available.


Heavy-duty and vulnerable properties, probably with a prior record of attempts at forced entry. Protection from experienced attempts at forced entry of commercial properties with no regard for noise. Further, the door is suitable for protection against attempted entry by explosive blasts.

IDE are an ISO14001 Certified Company, demonstrating that our organisation is committed to environmental issues and are proactively working to minimise our impact and reduce waste. Customers can rest assured that their roller shutter installations are manufactured, installed and maintained in the greenest possible way.