- Description
- Application
- Specification
- Installation
- Warranty
- Measure
High-Security Steel Doorset: Certified to LPS 1175 SR3 (C5)
Maximum Security. Professional Aesthetics. Certified Performance.
The Samson Defender Extreme-1 SR3 is a precision-engineered single leaf steel doorset designed for locations requiring serious protection. Fully certified to LPS 1175 Issue 8 Level C5 (SR3), it offers verified resistance against experienced forced entry attempts, making it an essential investment for high-value assets, critical infrastructure, and commercial premises.
Unlike traditional industrial steel doors, the Defender Extreme range proves that high security does not require compromising on aesthetics. With a high-quality finish and premium hardware, this door compliments modern building facades while delivering robust physical protection.
Certified Security & Performance
Manufactured entirely in the UK by Metador, this doorset is accredited by the LPCB (Loss Prevention Certification Board) to the stringent LPS 1175 Issue 8 standard.
- Security Rating: Level C5 (formerly SR3).
- Performance: Tested to withstand at least 5 minutes of sustained attack using a wide range of Category C tools, including gas torches, crowbars, and powered drills.
- Configuration: Outward opening single leaf (required for certification compliance).
Custom Built Specification
Every Defender Extreme-1 SR3 is made to measure to ensure a perfect fit for your structural opening.
- Maximum Width: 1460mm (including sub-frame).
- Maximum Height: 2500mm (up to 3440mm with optional top transom).
- Construction: The unit arrives pre-assembled with the door leaf factory-fitted into the heavy-duty steel sub-frame, complete with all specified hardware for straightforward installation.
Hardware & Finishes
Security does not mean limited choice. We offer an extensive range of LPS 1175 approved hardware to suit your operational needs, including high-security sashlocks, deadlocks, lever handles, panic bars for escape routes, and heavy-duty closers.
- Colour Options: Available in any standard RAL colour to match your corporate branding or building exterior.
- Marine Grade: Optional upgrades to marine-grade powder coating are available for properties in coastal or corrosive environments.
Suitability & Options
While built primarily as an external security barrier, the Defender Extreme-1 SR3 is equally suitable for internal secure lines. (Note: When using internally, please verify threshold suitability. Extended and ramped options are available).
Expandable Options: For larger openings or specific architectural requirements, we can incorporate solid, glazed, or louvered side and over panels, all manufactured to maintain the integrity of the LPS 1175 rating. Double leaf configurations are also available for wider apertures.
Typical Applications: Defender Extreme-1 SR3
The Samson Defender Extreme-1 SR3 is specified for environments where the risk of forced entry is high and the consequences of intrusion are severe. Its ability to withstand sophisticated attacks using gas torches, heavy-duty pry bars, and battery-powered tools makes it the industry standard for protecting critical assets and infrastructure.
Critical National Infrastructure
- Utilities: Remote water treatment works, pumping stations, and gas sub-stations.
- Power Generation: Electrical sub-stations, transformer rooms, and renewable energy sites.
- Telecommunications: Remote relay stations, mast sites, and fibre optic exchanges.
- Transport: Rail relay rooms, airport airside access, and tunnel service areas.
High-Value Commercial
- Data Centres: Physical protection for server halls and critical IT infrastructure.
- Retail & Logistics: High-value stock rooms (electronics, jewelry, designer goods) and bonded warehouses.
- Financial Services: Cash-in-transit transfer zones, ATM bunker doors, and branch back-of-house security.
Government & Secure Facilities
- Defense: MoD sites, armouries, and munitions storage.
- Blue Light Services: Police stations, evidence lockers, and emergency command centres.
- Public Sector: Council archives, secure record storage, and server rooms.
Specialist & Industrial
- Pharmaceuticals: Controlled drug storage and laboratory access (compliant with Home Office security guidelines).
- Hazardous Materials: Storage for dangerous chemicals, radioactive isotopes, or explosives.
- High-End Residential: Panic rooms, secure garages for high-value vehicles, and safe rooms.
If your project does not require resistance against gas torches or heavy-duty powered tools, the Defender Extreme-1 SR2 (B3) may be a more cost-effective solution. Contact our team for a risk assessment.
Technical Specification: Samson Defender Extreme 1 SR3 (Single Leaf)
The Samson Defender Extreme 1 SR3 is a high-security steel doorset designed to protect critical assets against experienced attempts at forced entry. It is certified to LPS 1175: Issue 8 Level C5 (SR3), providing a minimum of 5 minutes resistance against powered tools including gas torches, heavy-duty drills, and crowbars.
Certification & Standards
| Security Rating | LPS 1175 Issue 8: Level C5 (SR3) (Certificate No. 1284d) |
| Attack Testing | Resistant to Tool Category C (e.g., axes, gas torches, crowbars, cordless drills, reciprocating saws) for at least 5 minutes of active attack time. |
| Fire Rating (Optional) | Available with fire certification up to FD120 (120 minutes) to BS EN 1634-1. Note: Fire rating must be specified at time of order as it impacts core materials. |
Leaf & Frame Construction
| Leaf Construction | 45mm nominal thickness (double skinned). Manufactured from 1.5mm galvanised steel with internal reinforcements and anti-jemmy flange to the leading edge. |
| Core Material | High-density mineral wool with internal steel strengtheners. (Solid timber core options available for enhanced impact/acoustic performance). |
| Frame Profile | 90mm deep single rebate profile. Manufactured from 2.0mm high-tensile galvanised steel for increased rigidity against spreading attacks. |
| Threshold | DDA compliant stainless steel threshold (Standard). Options: Raised/extended cills or inward opening profiles with drainage. |
| Fixing Method | High-security internal bolted frame connections. Adjustable fixing points (approx. 16 per doorset) with chemical resin anchors recommended for SR3 compliance. |
Dimensions (Single Doorset)
| Configuration | Max Structural Width | Max Structural Height |
|---|---|---|
| Single Leaf | 1460mm | 2500mm |
| (Dimensions include fixing sub-frame) | ||
Hardware & Locking
Hardware fitted to the Defender Extreme 1 SR3 must be tested to LPS 1175 standards. Unauthorized substitution will void the security rating.
| Hinges | Minimum 4x Stainless Steel ball-bearing hinges per leaf (EN 1935). Fitted with multiple security dog bolts to lock the leaf into the frame if hinges are attacked. |
| High Security Locking |
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| Panic Hardware |
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Performance & Finishes
| Finish | Polyester Powder Coated (PPC) to any standard RAL or BS colour. |
| Marine Grade | Optional upgrade for C4/C5 environments (coastal/industrial) to prevent corrosion. |
| Thermal U-Value | Typically 2.2 W/m²K. |
| Acoustic | Up to 35dB reduction (approx.) with standard core and seals. |
Installation Guide: DIY vs. Professional
The Metador Defender 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:
- Place the frame in the opening.
- Use a cordless drill with a hex bit to wind out the adjusters until they grip the wall.
- This temporarily "clamps" the frame in place, allowing you to fine-tune the level and plumb without holding the full weight.
- 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.
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.
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).
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.
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.
