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G20

An exceptionally strong and secure steel door designed for challenging situations

G20 with optional continuous hinge, panic bar, outside operator and door viewer. Other options are available

G20 with optional continuous hinge, panic bar, outside operator and door viewer. Other options are available

G20 with optional continuous hinge, panic bar, outside operator and door viewer. Other options are available

G20

The G20 is an exceptionally strong steel door designed for challenging situations. All of its features contribute towards security and tamper resistance.

The G20 is also available in a blast rated version.

Uses
  • Gun rooms
  • Cash rooms
  • Vulnerable entrances
  • Pharmacies
  • Panic rooms
Technical details

Door construction of 2mm steel, with internal reinforcing and an insulated core. Thickness 45 or 55mm. Overhanging flanges to all four edges for security and weatherproofing. Three security pegs to hinge edge.

Frame construction of 2mm steel with internal reinforcing, integral frame adjusting screws and flexible weather seals. Adjustable standard hinges or full height continuous stainless steel hinges. 12 fixing points through jambs, 3 though threshold.

Weight 102kg for 1000 x 2100 single steel door.

Downloads
G20 Brochure.pdf
G15-G20-RX15-AC15 drawing.pdf

Request AutoCAD dwg
Frames

We produce two main frame types for our steel door range, all fitted with weather seals and security pegs.

Rebate Frame

Our general purpose frame for fitting between walls, into steelwork, masonry or timber. Adjustable hinges are fitted as standard, with continuous hinges as an option. The integral concealed adjusting screws will accommodate up to a 10mm clearance per side in the structural opening, eliminating the use of loose packings. Many profile variants and sizes are available.

Type 3 Frame

A special purpose frame, often used for portable or sectional buildings. The frame depth is normally tailored to match the wall thickness. Also available as a two-part clamp frame.

  • Rebate frame

  • Type 3

Thresholds

The threshold is designed as an integral part of the doorset, giving additional strength to the frame; aiding weatherproofing and sound reduction, and providing a stable surface for lower locking points.

For general purpose industrial buildings, construction is normally of galvanised steel. For offices, shops and public buildings, aluminium or stainless steel is used for the aesthetic qualities. For food preparation areas or wet situations, stainless steel has the necessary hygienic and corrosion resistance properties.

For very heavy use, we can fit additional internal reinforcing. For severe duty use, such as forklift traffic, solid stainless steel gives the ultimate in strength.

Where no threshold is required for a level access, the doorset will be delivered with a temporary threshold which is removed after installation.

We recommend that external doorsets with no threshold should be fitted with an automatic drop seal, to minimise water ingress, draughts and noise. Dropseals may be surface mounted or concealed within the door bottom.

Locking Systems

Specifying particular locks will change the operation of a doorset. Points to be considered are:

  • Emergency requirements
  • Frequency of use
  • Security


We can advise on the correct locking equipment for a particular use, but in general:

  • Personnel doors are fitted with a standard mortice lock.
  • Doors that need more security, can have additional mortice dead locks or a multi-point locking system.
  • Escape doors to be used by members of the public need a full width panic bar.
  • Escape doors to be used only by internal staff and not by members of the public, may be fitted with either a push pad or mortice escape lock. For frequent use as a personnel door, a mortice escape lock is the preferred option.

Mortice locks

Mortice locks fit insidethe door, and are available with several different functions

On a mortice escape lock, depressing the inside handle will override a locked cylinder or deadbolt. Standard locks and escape locks may be easily exchanged on site if escape functions are revised after installation.

Panic Bars and Push Pads

These units are surface mounted, have 1 to 3 locking points.

Cylinders

Europrofile lock cylinders are available in standard and drill-resistant, high security types. High security keys are not easily copied and can be useful to avoid unauthorised key duplication.
Various keying options are available - standard differ, keyed alike, master, suites etc.

Access control

Systems may be activated by various means, including card or proximity readers, keypads, microwave or infra-red sensors, biometric sensors, or just manual switches. To link with a building’s system, we can supply doorsets fitted with:

  • Electric handles
  • Electric strikes
  • Maglocks
  • Powered operators

Units are available in 12V or 24V, AC or DC to suit most access control systems.

Doorsets may be fitted with sensors to provide open or closed position information to a central control room.

Handles

First impressions count. As the first part of a building to be touched, steel and glass door handles need to be selected with care and attention to detail. All of our door handles are carefully chosen for their functionality, style and durability. They convey a message of quality - feeling solid and reassuring in the hand.

Finishes

Many of the door handles are available in a choice of materials: aluminium, brass, nylon or stainless steel, and may have a choice of finishes: brushed, satin or mirror polished.

Lever Handles

Lever handles are available with long backplates, or on round roses with a matching cylinder escutcheon.

Subject to a few limitations, our lever handles may be paired with most of the mortice locks, while the surface mounted locking systems have their own specific handles and outside operators.

Pull Handles

Our pull handles are all bolt-through for heavy duty use, with either a push plate to conceal the fixings of a single handle, or back to back fixings for a pair of handles. We offer a section of sizes, from 300mm to 1800mm, in straight, cranked, curved or angled styles.

Door Closers

Overhead closers are versatile and useful. All will close the door, to limit further access or maintain internal environments. Depending on the model chosen, they can also:

  • Control the opening and closing speed – useful in windy situations.
  • Restrict the door opening angle, to prevent damage to doors and the reveal corners.
  • Hold a door open - useful when carrying goods through.
  • Delay closing – helpful for parents with buggies or people with limited mobility.
  • Fire rated doors must be fitted with a self closing device so that the doorset will resist the spread of fire. If these doors need to be held open in normal use, we can fit electro-hydraulic closers linked to the building’s fire alarm system.

Surface mounted closers are available in several finishes, to complement the chosen colour scheme.

Concealed closers are useful in some situations:

  • Not visually intrusive – can promote a minimalist look
  • Will allow doors to be opened nearer to adjacent walls or other obstructions. The closer body does not protrude from the surface of a door, nor does its arm stick out.
  • Can be helpful in anti-ligature regimes.
  • Are less susceptible to vandalism.
Limit Stays

Adjustable telescopic limit stays are a budget alternative to closers. They can:

  • Restrict the door opening angle to prevent damage to doors and the reveal corners.
  • Be tightened to hold a door open.

Powered Operators

Powered operators are often fitted to main entrance doors to allow unimpeded entry and exit of pedestrians from a building. They can also be useful when:

  • Carrying goods through
  • Pushing trolleys through
  • Driving vehicles through
  • Linked to access control systems
Inward Opening Doors

Closers are usually mounted on the door leaf. On inward opening doors this can result in the closer body fouling the wall so you may need to allow extra clearance or a recess cut into the wall. 

Sizing

We produce both made to measure and standard sizes. When ordering, please note that it is customary to allow a fitting clearance of 0 – 8mm on the width and 5 – 10mm on the height of a doorset.

When fitting to steelwork or timber, we normally allow 5mm clearance on the width and 5mm on the height of a doorset. When fitting to masonry, we increase the clearances to 8mm on the width and 8mm on the height, to compensate for slight variations in the structural opening.

In general, clearances should be kept tight on the width for a neat appearance, but on the height, more clearance is advisable to allow for the arc of movement as the doorset pivots towards vertical during installation.

We always advise that actual structural openings are measured, if possible after the floor has been laid. Please do not assume that structural openings will be constructed exactly to the size shown on the architect’s drawings.

  

Standard Rebate Frames
  Overall and order size Structural opening Clear opening*
  895 x 2095 900 x 2100 764 x 2016
  935 x 2095 940 x 2100 804 x 2016
Standard single 1000 x 2090 1005 x 2100 869 x 2011
Max 1250 single 1240 x 2970 1245 x 2975 1109 x 2891
Standard double 1795 x 2095 1800 x 2100 1658 x 2016
Max 1250 double 2393 x 2970 2398 x 2975 2256 x 2891

 

Type 3 Frames
  Overall and order size Structural opening Clear opening*
  895 x 2045 900 x 2050 815 x 1996
  895 x 2095 900 x 2100 815 x 2046
  995 x 2095 1000 x 2100 915 x 2046
Double 1795 x 2095 1800 x 2100 1714 x 2046

* Door open to 90° and no allowance made for protruding lever handles. Contact us to ensure compliance with current Part M requirements or when clear opening dimensions are critical. With a level threshold, the height may be increased by 15mm.

  Preferred standard sizes


 

Colours and Materials

2mm zintec or 2mm stainless steel, polyester powder coated to any BS or RAL colour. Please be aware that some powders may be classed as special orders and therefore incur extra charges - please call us with your colour requirement and we will advise. For marine or off-shore use we can apply specialist corrosion resistant coatings.

RAL Colours
RAL 1000
RAL 1001
RAL 1002
RAL 1003
RAL 1004
RAL 1005
RAL 1006
RAL 1007
RAL 1011
RAL 1012
RAL 1013
RAL 1014
RAL 1015
RAL 1016
RAL 1017
RAL 1018
RAL 1019
RAL 1020
RAL 1021
RAL 1023
RAL 1024
RAL 1026
RAL 1027
RAL 1028
RAL 1032
RAL 1033
RAL 1034
RAL 1035
RAL 1036
RAL 1037
RAL 2000
RAL 2001
RAL 2002
RAL 2003
RAL 2004
RAL 2005
RAL 2007
RAL 2008
RAL 2009
RAL 2010
RAL 2011
RAL 2012
RAL 2013
RAL 3000
RAL 3001
RAL 3002
RAL 3003
RAL 3004
RAL 3005
RAL 3007
RAL 3009
RAL 3011
RAL 3012
RAL 3013
RAL 3014
RAL 3015
RAL 3016
RAL 3017
RAL 3018
RAL 3020
RAL 3022
RAL 3024
RAL 3026
RAL 3027
RAL 3028
RAL 3031
RAL 3032
RAL 3033
RAL 4001
RAL 4002
RAL 4003
RAL 4004
RAL 4005
RAL 4006
RAL 4007
RAL 4008
RAL 4009
RAL 4010
RAL 4011
RAL 4012
RAL 5000
RAL 5001
RAL 5002
RAL 5003
RAL 5004
RAL 5005
RAL 5007
RAL 5008
RAL 5009
RAL 5010
RAL 5011
RAL 5012
RAL 5013
RAL 5014
RAL 5015
RAL 5017
RAL 5018
RAL 5019
RAL 5020
RAL 5021
RAL 5022
RAL 5023
RAL 5024
RAL 5025
RAL 5026
RAL 6000
RAL 6001
RAL 6002
RAL 6003
RAL 6004
RAL 6005
RAL 6006
RAL 6007
RAL 6008
RAL 6009
RAL 6010
RAL 6011
RAL 6012
RAL 6013
RAL 6014
RAL 6015
RAL 6016
RAL 6017
RAL 6018
RAL 6019
RAL 6020
RAL 6021
RAL 6022
RAL 6024
RAL 6025
RAL 6026
RAL 6027
RAL 6028
RAL 6029
RAL 6032
RAL 6033
RAL 6034
RAL 6035
RAL 6036
RAL 6037
RAL 6038
RAL 7000
RAL 7001
RAL 7002
RAL 7003
RAL 7004
RAL 7005
RAL 7006
RAL 7008
RAL 7009
RAL 7010
RAL 7011
RAL 7012
RAL 7013
RAL 7015
RAL 7016
RAL 7021
RAL 7022
RAL 7023
RAL 7024
RAL 7026
RAL 7030
RAL 7031
RAL 7032
RAL 7033
RAL 7034
RAL 7035
RAL 7036
RAL 7037
RAL 7038
RAL 7039
RAL 7040
RAL 7042
RAL 7043
RAL 7044
RAL 7045
RAL 7046
RAL 7047
RAL 7048
RAL 8000
RAL 8001
RAL 8002
RAL 8003
RAL 8004
RAL 8007
RAL 8008
RAL 8011
RAL 8012
RAL 8014
RAL 8015
RAL 8016
RAL 8017
RAL 8019
RAL 8022
RAL 8023
RAL 8024
RAL 8025
RAL 8028
RAL 8029
RAL 9001
RAL 9002
RAL 9003
RAL 9004
RAL 9005
RAL 9006
RAL 9007
RAL 9010
RAL 9011
RAL 9016
RAL 9017
RAL 9018
RAL 9022
RAL 9023


BS 4800 Colours
00 A 01 - Ash grey / Oyster grey / Portland
00 A 05 - Goose grey / Sea mist / Goosewing
00 A 09 - Flint grey / Flint
00 A 13 - Storm grey / Greyfriar
00 E 53 - Black
00 E 55 - White
02 C 33 - Lupin pink / Candy floss / Pink wafer
02 C 37 - Clover pink / Corinth / Fontana
02 C 39 - Victoria plum / Aubergine / Plum
02 C 40 - Deep plum / Loganberry
04 B 15 - Rosepetal / Pastel pink / Dawn pink
04 B 17 - Dusty pink / Tea rose / Tearose
04 B 21 - Sable / Sierra
04 C 31 - Pink
04 C 33 - Orchid pink / Parisian pink / Shell
04 C 37 - Autumn brown / Rosevale
04 C 39 - Brick red / Copperbeech
04 D 44 - Misty red / Tawny
04 D 45 - Dark cherry / Russet / Monarch
04 E 49 - Rose pink / Petal
04 E 51 - Salmon red / Lobster / Azalea
04 E 53 - Poppy / Carnival red
04 E 55 - Red
04 E 56 - Carnival red
04 E 58 - Purple
06 C 33 - Peach / Cameo
06 C 35 - Light orange
06 C 37 - Leather brown / Brownstone
06 C 39 - Saddle brown / Saddle
06 C 40 - Brown
06 D 43 - Mid tan / Kalahari / Cinnamon
06 D 45 - Teak / Mace
06 E 50 - Mellow apricot / Apricot
06 E 51 - Mandarin orange / Clementine / Calendula
06 E 56 - Maori brown / Nectarine
08 B 15 - Magnolia
08 B 17 - Honey beige / Fawn / Sandstone
08 B 21 - Antelope
08 B 25 - Beaver brown / Beaver
08 B 29 - Bitter chocolate / Vandyke
08 C 31 - Honeysuckle cream / Blush stone
08 C 33 - Beige
08 C 35 - Fudge / Butterscotch / Bamboo
08 C 37 - Caramel / Bracken
08 D 41 - Yellow
08 E 51 - Golden yellow / Amber / Goldcup
08 E 55 - Orange
10 A 03 - Dawn grey / Sink grey / Flake grey
10 A 11 - Charcoal grey / Storm / Rhino
10 B 15 - Creamy white / Ivory / Gardenia
10 B 17 - Oatmeal / Greystone / Hopsack
10 B 25 - Turtle green / Turtle
10 B 29 - Vandyke brown / Ironstone
10 C 31 - Ivory / Champagne / Buttermilk
10 C 33 - Vanilla / Pollen
10 C 35 - Wheat / Golden bronze / Savannah
10 C 39 - Dark olive / Saluki / Seaweed / Riverbed
10 D 43 - Golden maize / Banana / Capricorn
10 D 45 - French mustard / Florida
10 E 49 - Pale primrose / Pale lemon / Jonquil
10 E 50 - Light grapefruit / Forsythia
10 E 53 - Sunflower yellow / Canary / Aztec
10 E 55 - Canary Yellow
12 B 15 - Sea foam / Seafoam
12 B 17 - Green Mist / Willow
12 B 21 - Mineral green / Opaline / Moorland
12 B 25 - Spruce green / Thyme / Chive
12 C 31 - Light yellow
12 C 33 - Green haze / Catkin
12 C 37 - Green
12 C 39 - Ivy green / Orchard
12 D 41 - Green
12 D 43 - Greengage / Sapling / Springleaf
12 D 45 - Dark laurel / Tundra / Sherwood
12 E 51 - Pale lime / Citrine
12 E 53 - Linden green / Linden
12 E 55 - Green
14 C 31 - Glacial green / Alpine
14 C 35 - Iceplant green / Braemar
14 C 39 - Holly green / Hollybush
14 C 40 - Moss green / Conifer
14 E 49 - Light green
14 E 50 - Green
14 E 51 - Bright green / Goblin / Garland
14 E 53 - Irish green / Avarice / Verona
16 C 33 - Duckegg / Duck egg blue
16 C 37 - Reef green / Orion
16 D 45 - Dark jade / Scarab
16 E 50 - Turquoise
16 E 53 - Aquamarine / Seafarer / Lido
18 B 17 - Blue mink / Silver haze / Heron
18 B 21 - Squirrel grey / Tideway
18 B 25 - Dark admiralty grey / Merlin
18 B 29 - Raven
18 C 31 - Ice blue / Spindrift
18 C 35 - Corvette blue / Pigeon
18 C 39 - Fathom blue / Deep river / Dolphin
18 E 49 - Crystal blue / Astral blue / Pinefrost
18 E 50 - Ribbon blue / Cirrus
18 E 51 - Delphinium Blue / Mermaid / Larkspur
18 E 53 - Tartan blue / Cobalt blue / Regatta
20 C 33 - Porcelain blue / Pompadour
20 C 37 - Larkspur blue / Viking
20 C 40 - Duchess blue / Midnight
20 D 41 - Powder blue
20 D 45 - Sapphire blue / Maritime / Trafalgar
20 E 51 - Cornflower blue / Corfu / Cornflower
20 E 53 - Blue
20 E 56 - Blue
22 B 15 - Pearl grey / Swansdown
22 B 17 - Pale lavender / Haze / Dove
22 C 37 - Purple heather / Heather
22 D 41 - Purple
22 D 45 - Deep purple / Pageant
24 C 33 - Pale lilac / Mallow
24 C 39 - Regal violet / Regalia
24 E 53 - Purple



Colours shown on your screen or printer may vary from actual product colours, which may also vary slightly between batches. If you would like to see an actual colour sample, please call us.

G20 Steel doorset specification examples

The G20 is an exceptionally strong steel door designed for challenging situations. All of its features contribute towards security and tamper resistance.

We are always pleased to offer door specification advice. It is very important to us that our doorsets are correctly specified for their intended use so that they may give many years of trouble-free service. We believe in offering the best options for your project so that you get a product that is manufactured exactly to your needs.

Below are some example G20 specifications. Please feel free to edit them for use in your plans, tender documents or specifications. If you cannot see just what you want, then please contact us and we will be pleased to write specifications for you.

G20 steel doorset with heavy duty locking

From DoorTechnik, Moor Lane, Thorpe on the Hill, Lincoln, LN6 9BW. Tel 01522 693522.

Single doorset, 1000w x 2100h, polyester powder coated to BS..... / RAL.....
(Edit size and colour to your needs)

45mm door leaf, constructed of 2mm steel, with internal reinforcing and an insulated core. Overhanging flanges to three edges for security and weatherproofing. Three security pegs to hinge edge.
Frame construction of 2mm steel with internal reinforcing, integral frame adjusting screws, flexible weather seals, tamper-resistant lock jamb and full height continuous stainless steel hinge. 12 fixing points through jambs, 3 though threshold.
Heavy duty 3-point surface mounted locking system with lever handles, deadlatch and drill resistant lock cylinder.

 
G20 steel doorset with 3 mortice locks

From DoorTechnik, Moor Lane, Thorpe on the Hill, Lincoln, LN6 9BW. Tel 01522 693522.

Single doorset, 1000w x 2100h, polyester powder coated to BS... / RAL.. 
(Edit size and colour to your needs)

45mm door leaf, constructed of 2mm steel, with internal reinforcing and an insulated core. Overhanging flanges to four edges for security and weatherproofing. Three security pegs to hinge edge.
Frame construction of 2mm steel with internal reinforcing, heavy-duty adjustable standard hinges, integral frame adjusting screws and flexible weather seals. 12 fixing points through jambs, 3 though threshold.
Central mortice lock with lever handle, two additional top and bottom deadlocks, all fitted with drill resistant euro profile cylinders.

 

U Values

The U Values for the G20 steel door have been calculated to EN 673, EN ISO 10077-1 and EN ISO 10077-2. As standard, all G20 doorsets have an insulated core.

A standard 45mm G20 with foam core is 2.4 W/(m²K)

The rest of the range is between 2.9 W/(m²K) and 5.2 W/(m²K). Please contact us for more details.

 

Get in touch

We have people here who are pleased to talk doors with you; whether you need a single door for a plant room, lots of shiny steel and glass doors for a shopping centre, or have specialist technical requirements.

EMAIL US +44 (0) 1522 693 522