Securidor+ S4 Security Rated Steel Door-sets


Call the steel door experts now on:

Securidor+ S4 security door range is accredited to offer a high level of security against potential attack from heavy duty tools such as felling axes and disc grinders. These single and double door sets are available in a wide range of bespoke sizes, with over 100 locking options and a choice of RAL/ BS colours. The range is suited for use in high security installations, such as Ministry of Defence, banks, schools, utility buildings, sub-stations and Home Office approved gun rooms.

SR4 Door pic

Single personnel door-set

Securidor+ S4

Bespoke security-rated steel door-sets. LPS1175: Level 4 Issue 8 Cert/LPCB ref. 1542c

14 day lead time

Up to 2.75m high

1 year warranty

Next day quote


Call us on 01524 727000 for free expert advice and a fast quotation

Securidor+ S4 - Meets the requirements and testing procedures of LPS1175: Issue 8. LPCB approved and listed for intruder resistant building components, strongpoints, security enclosures and free standing barriers.

Securidor+ S4 - LPS 1175: Level 4 Issue 8 Cert/LPCB ref. 1542c

Typical door types and sizes

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

Single door size Double door size
Min 500 x 1500mm Min 900 x 1000mm
Max 1284 x 2752mm Max 2492 x 2752mm
SR3 Door Types

If you are unsure, or have a question, then please talk to one of our expert sales team, who will be able to advise and guide you.

Typical Securidor+ S4 specification


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


Manufactured from 1.5mm steel on inner and outer face, the composite door leaf is 45mm thick with integral astragal lip to the closing edge. It weighs approximately 80kg per square metre.

Standard threshold

Leading face fits under the door - see below


Certified by the Loss Prevention Certification Board to LPS 1175 Level 4 Issue 8 Cert/LPCB Ref. 1542c

Key Features

The range is certified to LPS1175 level 4, and fitted with extreme heavy duty hinges complete with 2 integral dog bolts per hinge. Constructed to resist attack from high powered cordless tools, felling axes, disk grinders, jigsaws etc.


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


Choice of personnel, panic and escape hardware, with over 100 locking options available - including single and multi point bolting. All escape hardware complies with BS EN 179. Full list of compliant hardware can be found at

Optional Extras

Certified Louvres available up to 400mm square.

For hardware and configuration please contact our sales team on 01524 727000

Typical leaf and frame construction

Standard threshold

Securidor+ typical door features

  • Independently tested by LPCB 1175 and passed stringent attack testing
  • Single rebate minimum depth 38mm x 100mm
  • Leaf 1.5 galvanised steel
  • Minimum of 5 Reinforced fixing points either side with additional 2 on the head jamb for double doors
  • 45mm thick door leaf with an anti leverage astragal
  • D Seals
  • Double skinned with interlocking strengthening seams
  • Minimum of 4 Reinforced, Pre treated and Protected Grade 13 stainless steel ball bearing butt hinges (complies with EN 1935:2002)
  • Vertical Anti Twist Interlocking welded channel core
  • Reinforced lock keep
  • Dense Rockwood Core
  • Frame: 100mm galvanised steel
  • Powder Coated (pre treated and primed as standard offering additional protection)

Call us on 01524 727000 for free expert advice and a fast quotation