Samson Defender Extreme 2 SR3 | Steel | Samson

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Samson Defender Extreme 2 SR3

Security Rated Steel Doorsets

LPS1175 SR3 Security Door - Double Leaf

Material: Steel
Gear Type: Hinged Doors

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Web Price: £3,420.00

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Description
Application
Specification
Installation
Warranty
Measure

Description

Samson Defender Extreme-2 (SR3) Double Steel Doorset

The Samson Defender Extreme-2 is a high-security, custom-built double leaf steel doorset, designed to provide verified protection for high-value assets and critical infrastructure. Manufactured in the UK by Metador to rigorous standards, this door achieves a C5 security rating (equivalent to the former SR3) under the stringent LPS 1175 Issue 8 testing standard.

Tested and accredited by the BRE (Building Research Establishment), the Defender Extreme-2 offers proven resistance against determined attacks using a wide range of heavy-duty tools, including crowbars, axes, and cordless power tools, for a minimum of 5 minutes. This makes it an essential investment for facilities requiring a serious, certified security upgrade.

Certified Construction & Design

Unlike the misconception that high-security doors must look "industrial," the Defender Extreme-2 combines formidable strength with aesthetic flexibility. The double-skinned steel leaves are folded and mechanically fixed or welded (depending on specification) to form a rigid barrier, filled with a mineral wool core and steel strengtheners.

Ideally suited for external use, the doorset is typically supplied as outward opening to maximise attack resistance (the rebate prevents the leaves being driven inward).

Certification: LPS 1175 Issue 8 rating C5 (SR3).
Manufacture: Produced entirely in the UK by Metador for Samson Doors.
Finish: Available in over 200 polyester powder coat (PPC) colours to match any building façade, with Marine Grade finishes available for coastal environments.

Dimensions & Configurations

The Samson Defender Extreme-2 is a truly bespoke product, made to measure to suit your specific structural opening.

Max Width (Double Door): Up to 2890mm structural opening width.
Max Height: Up to 2490mm (Standard) or extended up to 3440mm with removable or solid over-panels.
Side Panels: Fixed side panels can be incorporated to span wider openings up to approx 4900mm, fully tested to the same SR3 standard.

Note: A single leaf version, the Samson Defender Extreme-1 (SR3), is also readily available for personnel access requirements.

Hardware & Installation

Security is only as effective as the locking system. The Defender Extreme-2 is factory-fitted with high-security hardware that has been specifically tested as part of the accredited doorset.

Locking: Multi-point locking systems, heavy-duty panic bars, and electro-mechanical options are available, all approved to the LPS 1175 C5 rating.
Frame: Supplied with a factory-fitted steel sub-frame containing all necessary fixing points, ensuring the installation is as robust as the door itself.
Thresholds: A variety of threshold options are available, including DDA compliant low-profile and dropped thresholds for weather rating. (Please check suitability for internal vs external use based on weather sealing requirements).

Options & Upgrades

To meet specific site requirements, the Defender Extreme-2 can be customised with:

Vision Panels: High-security glazing options (SR3 rated).
Louvres: Secure ventilation grilles tested to LPS 1175.
Thermal & Acoustic: Upgrades available to enhance U-values (down to 1.5 W/m²K) and sound reduction (up to 36dB Rw).

Application

Any commercial or industrial building requiring very high levels of security at all times. SR3 steel doors are tested against a wider range of tools, including modern power tools to offer greater resistance to attack than SR2 rated doors. The doors are designed to resist an attack for at least 5 minutes when the intruders are not too bothered about some noise made either.

Not only do these doors offer greater levels of security, they are also manufactured to higher standards with stronger overall integrity and components used and therefore always tend to have greater longevity through their durability.

Specification

Technical Specification: Samson Defender Extreme-2

The Samson Defender Extreme-2 is a custom-made steel security doorset, manufactured by Metador to the Defender Xtreme 3 specification. It features internal reinforcement designed to resist sustained attack from a wide range of heavy-duty tools.

Security Certification

Rating: LPS 1175 Issue 8 - Level C5 (Equivalent to SR3)

LPCB Reference: Tested under Metador Defender Xtreme series (Cert Ref: 1284 series)

Dimensional Capacities

Single Door Max Width	1490mm (Structural Opening)
Single Door Max Height	2490mm (Standard)
Double Door Max Width	2890mm (Structural Opening)
Double Door Max Height	2490mm (Standard)
With Side/Over Panels	Max Overall Width: 4900mm Max Overall Height: 3500mm

Door Leaf & Construction

Material: 1.5mm / 2.0mm Galvanised steel double skin construction (thickness varies by exact rating spec).
Core: Mineral wool with integral steel stiffeners.
Feature: Anti-jemmy flange on the leading edge to prevent forced lever attacks.

Door Frame & Threshold

Frame Material	2.0mm Galvanised steel.
Construction	Folded profile with bolted corners and integrated silicone rubber seals for optimal weather, thermal, and acoustic performance.
Finish	Pre-finished to match the door leaf colour (or contrasting colour if required).
Threshold	Standard DDA compliant chamfered profile (stainless steel). Options: Raised/extended cills, inward opening profiles with drainage, or 4mm ramped design. Integrated removable thresholds available.

Hardware Options

An extensive range of hardware is available, all tested and approved within the LPS 1175 C5 (SR3) rating.

Primary Locking: Mico Tindall high-security multipoint sashlocks or deadlocks.
Panic Hardware: Full-width stainless steel push bars (Single leaf) or multi-point panic sets (Double leaf) tested to BS EN 1125.
External Access: High-security outside access devices (OAD) with cylinder protection.
Closers & Stays: Heavy-duty closers and friction stays approved for use on security doors.

Panels & Glazing

Side & Over Panels: Solid, double-skinned steel panels available to extend the structural opening up to 4.9m wide, fully compliant with the SR3 rating.

Vision Panels: High-security glazing options available (sizes and configurations subject to SR3 limitations—please enquire).

Installation

Installation Guide: DIY vs. Professional

The Metador Defender Double Doorset is designed with the installer in mind, featuring a unique "Fast-Fit" adjustable frame system. However, due to its heavy-duty construction, it is physically demanding to handle.

1. Handling & Weight (Critical Warning)

Do not underestimate the weight of this door.

Weight: A single Level 2 or Level 3 steel door can weigh in excess of 80kg - 120kg depending on size and core specification.
Manpower: We strongly recommend a minimum of 2 strong people for offloading and positioning. For larger or solid-core doors, 3 people or mechanical lifting aids (genie lift/glass lifter) are advised.
Delivery State:
- Single Doors: Typically delivered fully assembled (door leaf pre-hung in the frame). You may need to separate the leaf from the frame to reduce weight for positioning.
- Double Doors: Often delivered with the frame and leaves separate to make handling manageable.

2. The "Fast-Fit" Adjustable Frame

The Extreme features a clever frame design that removes the need for fiddly packers or shims.

Adjusters: The frame is fitted with roughly 16 threaded hexagonal adjusters (depending on size).
Method:
1. Place the frame in the opening.
2. Use a cordless drill with a hex bit to wind out the adjusters until they grip the wall.
3. This temporarily "clamps" the frame in place, allowing you to fine-tune the level and plumb without holding the full weight.
4. Once perfectly level, you drill through the centre of the adjusters into the masonry/steelwork and bolt it home.

3. Tools Required

SDS Drill (for masonry fixing holes).
Impact Driver (for driving concrete bolts).
Long Spirit Level (1800mm+) – Essential for checking the hinge jamb is 100% vertical.
12mm / 14mm Hex Bit (for frame adjusters).
Crowbar / Air Wedge (for final lifting/positioning).

4. Should I Install It Myself?

DIY / Builder

Pros: Save on labour costs.

Cons: Handling the weight can be dangerous without experience. If the frame is not fitted 100% square (even 2mm out), the heavy door will not latch correctly or may swing open/closed on its own.

Professional Door Installer

Pros: They will have the lifting gear and experience to handle the weight safely. They understand how to "toe-and-heel" glaze and adjust heavy-duty hinges for perfect operation.

Cons: Higher initial cost.

Recommendation: If you are an experienced builder with a helper, the "Fast-Fit" system makes this a straightforward job. If you are a DIY novice, we strongly advise hiring a professional purely due to the health and safety risks of handling heavy steel doors.

Warranty

As an authorised distributor for Metador products, Samson Doors is proud to offer the full manufacturer’s guarantee on all Defender Extreme-2 doorsets. Metador's commitment to quality is backed by a comprehensive warranty structure, detailed below.

Warranty Periods

Door Leaf & Frame	15 Years (Subject to correct installation and documented maintenance)
Marine Grade Finish	10 Years (Subject to strict cleaning/maintenance programme in coastal environments)
Standard PPC Finish	1 Year (Subject to standard cleaning programme)
Ironmongery / Hardware	1 Year (Subject to correct usage and maintenance)

Guarantee Coverage

Metador (via Samson Doors) will repair or, at their option, replace any goods sold which are shown to their reasonable satisfaction to have become defective within the warranty periods stated above.

Defective Goods: Defined as products which, under correct usage, do not function properly due to a fault in materials, workmanship, or design.
Component Replacement: Where a product has a specific internal defective component, only that component will be replaced, not the entire unit.
Delivery Damage: Goods found to be defective on delivery will be replaced if reported within 3 working days of receipt. Photographic evidence showing the defective goods on the original delivery pallet is mandatory.

Exclusions

The guarantee does not cover damage or failure caused by:

Incorrect installation or repairs carried out by unauthorised persons.
Abuse, neglect, or lack of maintenance (including failure to keep a maintenance log).
Use of harmful cleaning solvents or abrasive materials on the paint finish.
External impacts, weather damage, or fair wear and tear.
Installation of parts or hardware not advised or supplied by Metador.
Damage to the paint finish (scratches, chips) occurring after delivery.

Important: Maintenance Log Required
For any guarantee or warranty to be valid, the cleaning and maintenance regime must be documented and recorded. You must keep a log confirming the frequency of maintenance, along with the methods and products used. This documentation must be submitted for any claim to be considered.

Claims Procedure

Notification: You must contact Samson Doors in writing within 3 working days of discovering the defect, specifying the nature of the claim and the fault.
Inspection: On request, the defective product may need to be returned to Metador Ltd (at the customer's cost) for inspection to verify the claim.

For full details on the required care regime, please download the Operation & Maintenance Manual (PDF).

Measure

How to Measure for Your Steel Doorset

Ordering a steel doorset is straightforward, but accuracy is critical. Unlike some timber doors, steel doorsets are manufactured to exact engineering tolerances. We rely on you to provide the OVERALL manufacturing size (Door Leaf + Frame), not the opening size.

1. Understand the Manufacturing Size

When you place an order, the dimensions you give us will be the exact size of the door frame itself. We do not deduct any tolerance for you.

The "Fitting Clearance" Rule:
We recommend allowing a minimum of 10mm clearance on the width (5mm each side) and 5mm - 10mm clearance on the height (top gap).

Example Calculation:
If your structural opening measures 2300mm wide x 2100mm high, you should order a doorset size of:
Width: 2290mm (2300mm - 10mm clearance)
Height: 2090mm (2100mm - 10mm clearance)

Note: This clearance allows you to shim the frame level if your brickwork is slightly uneven. If your opening is very rough or out of square, you may wish to allow more tolerance.

2. Measuring Your Aperture

Follow these steps to ensure your opening is suitable:

Measure Width: Take three measurements (Top, Middle, Bottom). Use the smallest of these three figures as your structural width.
Measure Height: Take two measurements (Left and Right). Use the smallest of these two figures as your structural height.
Check for Square: Measure the diagonals (top-left to bottom-right, and top-right to bottom-left). If these differ significantly, your opening is not square, and you may need to allow extra tolerance or pack out the frame.

3. Key Points to Remember

Use Millimetres: Always measure and order in mm. This avoids confusion and ensures precision.
Include the Threshold: The overall height you order includes the threshold. Be aware of your finished floor level.
Sub-Frame Included: The dimensions cover the entire unit (leaf + outer sub-frame).

Final Check & Approval

Don't worry about making a mistake on the initial order form. For every custom steel doorset, we will always create a technical drawing for your approval before manufacturing begins. This gives you a final chance to check the exact dimensions, handing, and specification against your site measurements.