CHUBB Strong Doors 3½″ Strongroom Door

The CHUBB Strong Doors 3½” Strongroom Door stands as a pinnacle in security solutions, featuring a reinforced build and advanced protective features for unparalleled defense. Renowned for its robust 3½” thickness, CHUBB Strong Doors 3½” Strongroom Door ensures stringent access control and exceptional resistance against unauthorized entry or intrusion. Designed for strongrooms or high-security zones, CHUBB Strong Doors 3½” Strongroom Door provides top-tier protection for assets in various commercial, institutional, or sensitive environments, prioritizing utmost security and safeguarding of valuable contents.

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CHUBB Strong Doors 3½″ Strongroom Door

Model: 3½″ Strongroom Door



  • Door slab thickness: 89mm (3½"), overall thickness: 226mm
  • Filled with reinforced barrier material and steel fibers for resistance
  • Resistant to drilling, oxyacetylene cutting, and jack attacks
  • Secured by 7 active front bolts, 2 top, 2 bottom, and 7 fixed rear bolts (50mm diameter)
  • Features a 3-wheel Keyless Combination Lock and 11-lever double bitted Key Lock, independent operation
  • Protected by two Glass Relockers, activating against forced tampering
  • Relockers further safeguarded by Chubbsafes patented Torch and drill-resistant (TDR) material
  • Door frame "wrapped around the wall" design made of steel sections for stronger resistance against attacks



  • Weight(grams): 740000
  • Fire Resistance: 120 minutes (Tested in accordance with BS476 Part 22:1987 FireTest on Building Material and Structure)
  • Locking System: UL Listed 3-wheel mechanical combination lock + 11-lever double bitted Key Lock from Germany
  • Accessories: 1 pair of operational key for Chubbsafes 3.5" Strongroom Door ; 1 pair operational keys for Grille Gate (optional fitting)
  • External Dimension: 2110H x 1312W mm
  • Clear Opening: 1920H x 814W mm
  • Overall Door Thickness: 226mm (Filled with a specially formulated barrier materials reinforced with steel fiber provides resistant to high speed drilling, oxy-acetylene cuttings and jack attacks)
  • Protective Thickness: 89mm (3.5")
  • Type of Resistance: Burglary
  • Valuables to Protect: Cash, Documents, Other valuables
  • Wall Thickness (inclusive of plastering): 200mm
  • Internal Fittings - Emergency Ventilator: Yes. (An emergency ventilator is integrated into the door frame to provide fresh air, allow two way conversation and to supply food or water to anyone trapped inside the strong room)
  • Internal Fittings - Lighting Control Switch: Yes. (A relay micro switch is fitted to the door to control the electric lighting in the room and to ensure that when the door is closed, all lighting within the room is switched off)
  • Internal Fittings - Alarm Micro Switch: Yes. (A relay micro switch is fitted to the door for possible connection to the main intruder alarm system as an additional protection)
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