Security Rated Door SR3

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Strongdor Securidor plus

Securidor+ S3 - Meets the requirements and testing procedures of LPS1175: Issue 7. LPCB approved and listed for intruder resistant building components, strongpoints, security enclosures and free-standing barriers. 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 substations.

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

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Trustpilot rated Excellent
Easy fit doors
1 year warranty

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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

Strongdor Icons Acoustic
Acoustic Rating

Est 35 dB

Thermal Transmittance

U Value Est. 2.28


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.

Standard threshold
Leading face fits under the door - see below

Certified by the Loss Prevention Certification Board to LPS 1175 Level 3 Issue 7 Cert/LPCB Ref. 1542a

Key Features
The range is certified to LPS1175 level 3 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.

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

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.

Optional Extras
Louvre Panels (subject to hardware)

Security Rated Leaf and Frame

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Standard Threshold

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Securidor3 TechSpec Thumbnail 22

Securidor+ Level 3

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Strongdor Standard Colours 22 Thumbnail

Standard Colours & Coatings

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Securidor SR3 steel door fitting instructions

SR3 Security Fitting Guide

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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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