Security Rated Steel Door - SR3

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The Securidor+ S3 security door range comprises of single and double security-rated steel door-sets that are specifically designed for use in locations that would benefit from enhanced protection. The typical applications for this range includes retail outlets, cash rooms, warehouses and utility sub stations.

Please note that these door-sets can only be supplied with outward opening leaves.

  • Secure for sure with Strongdor
  • 14 locking options available
  • Louvre Panels in different configurations
Unique Range Features

Easy fit doors
1 year warranty
Steel door experts
Trustpilot rated Excellent

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Made in Britain Colour

Product Features

Height Icon

Single - up to 3.06m
Double - up to 3.06m

Width Icon

Single - up to 1.4m
Double - up to 2.51m

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Acoustic Rating

Est 35 dB


305-800mm wide by 305-1025mm high - Not available with panic hardware

Further information


The welded frame is made from reinforced 1.5mm galvanised steel and a 38mm x 100mm single rebated profile. It is reinforced at hinges, lock keeps and fixing points.

Manufactured from 1.5mm galvanised attack face steel with 1.5mm inner face, the composite door leaf is 51mm thick with astragal lip to the closing edge. It weighs approximately 80kg per square meter.

Key Features
The range is certified to LPS1175 SR3, and fitted with doubled hinges for additional strength. It also incorporates an anti leverage cover strip to closing edge of door leaf. The door-sets are also Secured by Design approved and are also available with louvres.

Certified by the Loss Prevention Certification Board to LPS 1175 SR1 Issue 7 Cert/LPCB Ref. 1542a .

Leading face fits under the door.

Choice of Hooply Cefiro multipoint lock, Mico Tindall AD1 push pad, Mico Tindall AD2 full push pad, Mico Tindall AD3 lever handle, Mico Tindall MD1 push pad, Mico Tindall MD2 full push pad and Mico Tindall MD3 lever handle hardware. Heavy duty tower bolts on the passive leaf. Keys and cylinders can be registered to eliminate the chance of key copying.

Wide choice of finishes available including powder coated finish from our range of RAL or BS colours.

Optional Extras
Louvre Panels (subject to hardware)
305 - 800mm wide by 305 - 1025m high
(Not available with panic hardware)

Suitable Substrate
Brickwork/concrete blockwork, or structural steelwork.
Minimum Fixing Size - M10

Securidor Typical Leaf and Frame

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Standard Threshold

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Securidor+ Level 3

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Standard Colours & Coatings

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Securidor SR3 steel door fitting instructions

SR3 Fitting and Maintenance Instructions

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Air Circulation

Louvre Panels

Designed to increase airflow in areas that need efficient ventilation, louvred door, side, over panels and walls offer a flexible solution without compromising security or structural integrity.

Airflow panels

Door Configurations

Door Configurations for Steel Doors with security rating 3 & 4

Sr3 Doubles
Sr3 Singles

Over 150 colours available

View Colour Options

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Frequently Asked Questions

Which security door is the best?

Unfortunately there is no simple answer to this question as all security rated door-sets have protection enhancement. The level of security required for your door-set will be dependent on the location and specification of your installation.

Check out our documents LPS 1175 vs PAS 24:2016 and LPS 1175 Explained to see which security rating may be best for you!

Who is responsible for ensuring the sales quotation meets the specification and building regulations, including location and method of installation?

It is the customer’s responsibility to ensure all details within the sales quotation / sales order meet the exact specification and / or original enquiry and are compliant with current building regulations including location and method of installation.

We are here to help and advise only and cannot accept responsibility for discrepancies after the order is confirmed.

Strongdor Terms and Conditions

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