Door hinges in Australian construction: sizes, materials, fire-rated

TL;DR

Door hinges in Australian construction are dominated by butt hinges (a pair of hinged leaves connected by a knuckle and pin) fitted into mortised pockets cut from both the door edge and the frame. Used the same way across Class 1a houses, Class 2 apartments, and Class 3-9 commercial work; Class 2 inter-tenancy doors and Class 5-9 commercial fire doors take fire-rated and heavy-duty hardware from the same product families. The two specification calls are size (75 mm or 100 mm are the residential defaults; 100 mm covers internal hollow-core, solid-core, and most external doors up to 2040 mm × 870 mm) and type (standard fixed-pin, ball-bearing for heavy doors and high-traffic, removable-pin for easy door removal, parliament for double doors). Three hinges per door is the standard (top, middle, bottom); two is acceptable for very light internal doors but adds risk of warping. Materials: steel zinc-plated (volume budget), brass (decorative), stainless 304 (general internal), stainless 316 (coastal, splash zones, exterior salt-spray exposed). The AU brand market is led by Lockwood, Brio, Pryda, Hafele, and Hettich; specifier-led projects often use European brands (DuPont-derived high-grade stainless, Anuba, AGB). Fire-rated doors (FRL-30+ in inter-tenancy, garage-to-house) need specifically tested fire-rated hinges matching the door assembly; generic residential hinges fail FRL tests. The two job-killers: under-hung doors (too few hinges or hinges too small for the door weight; the door warps, jams, and the latch fails to engage within months), and using non-rated hinges in fire-rated assemblies (the rated door rating is invalidated).

What it is

A butt hinge is a fixed-pivot mechanical connection between the door edge and the door frame. It has two leaves connected by a knuckle (the central cylindrical pivot section) and a pin that runs through the knuckle. The leaves are screwed into mortised pockets cut from the door edge and the frame; the knuckle protrudes from the door edge and forms the visible cylindrical column at the hinge line.

Each leaf is typically rectangular, 3 to 4 mm thick (steel) or 1.6 to 2.5 mm (stainless), with countersunk holes for fixing screws.

The Australian standard for door locks (AS 4145.2:2008) is the companion to hinge selection. NCC 2022 ABCB Housing Provisions Part 11 (Safe movement and access) sets the requirements for doors in residential.

Sizes

Size (leaf height × leaf width)	Where used
50 mm × 50 mm	Cabinet doors (different product class, not in scope here)
75 mm × 75 mm	Light internal doors (hollow-core, low traffic)
100 mm × 75 mm	Standard internal and external doors (the volume default)
100 mm × 100 mm	Heavy solid-core doors, premium
125 mm × 100 mm	Heavy fire-rated, oversized doors
150 mm × 100 mm	Premium oversized doors, heavy commercial overlap

A typical residential door (2040 mm × 870 mm × 35 mm solid-core or 40 mm hollow-core) uses three 100 mm × 75 mm butt hinges. The middle hinge sits at 1100 mm above the floor (approximately at the lock height); top hinge 250 mm down from the door top; bottom hinge 250 mm up from the door bottom.

Types

Standard (fixed-pin) butt hinge

The default: two leaves, a knuckle, a pin that’s pressed into the knuckle and not removable in service. Used on most internal and external residential doors.

Ball-bearing butt hinge

Adds a ball-bearing washer between leaf and knuckle, reducing friction. Used where:

Heavy doors (solid-core, fire-rated) where friction-induced binding is a risk
High-traffic doors (front entry, common-area doors) where wear over many cycles matters
Premium specification

Removable-pin butt hinge

The pin can be lifted out from the top of the knuckle. Allows the door to be removed without unscrewing the hinges. Useful for:

Furniture moving access
Door replacement
Painting (door removed for spraying)

The pin is held in by a small spring detent or pinch fit. Some products have a non-removable-pin version (NRP) for security applications where you don’t want someone removing the door from outside.

Security butt hinge

Adds a steel pin or “dog” that protrudes from one leaf into a matching hole in the other, preventing the door from being lifted out even if the pin is removed. Used on external doors and high-security applications.

Parliament butt hinge

A T-shape with extended leaves that allow the door to swing back 180° flat against the wall. Used on double doors, French doors, and where the door needs to open fully against an adjacent wall.

Concealed butt hinge

Modern style; the hinge sits inside the door edge and the frame, invisible from the room side when closed. Used on premium contemporary doors and flush-mounted door systems. Examples: Soss, Tectus, Anuba.

Pivot hinge

A different category: the door pivots on top and bottom pivots rather than side-edge knuckles. Used on heavy oversized doors, pivot entry doors, and some premium contemporary designs.

Materials

Material	Where used	Typical cost relative to steel
Steel, zinc-plated	Volume budget residential, internal	Baseline
Steel, satin chrome / nickel plated	Standard residential, painted finish	+30-50%
Brass, solid	Heritage, traditional, decorative	+100-300%
Brass, plated	Decorative budget alternative	+30-80%
Stainless 304	Wet-area and high-traffic internal	+50-100%
Stainless 316	Coastal exterior, marine, salt-spray	+100-200%
Bronze, oil-rubbed	Premium heritage	+200-400%
Powder-coated steel (black, matte)	Contemporary architectural	+20-50%

For external residential doors within 1 km of breaking surf, stainless 316 is the only material that maintains corrosion-free function long-term.

Fire-rated hinges

Doors in fire-rated assemblies (FRL-30, FRL-60, FRL-90, FRL-120) need hinges specifically tested as part of the door assembly under AS 1530.4:2014. The hinge:

Must be rated for the door assembly’s FRL
Typically stainless steel or fire-rated brass
Must use the specified fixing screws and pattern
Must allow the door to close fully and remain functional during the fire test duration

Common fire-rated hinge brands: Lockwood Fire Door Hinge, Hafele Hinges, AGB, Anuba. The hinge is part of the tested system, not interchangeable with generic residential hinges.

Australian brands

Brand	Range	Where used
Lockwood (ASSA ABLOY)	Full residential range, fire-rated	National
Pryda	Multinail; standard residential	National volume residential
Brio	Sliding-door hardware, but also pivot and butt	Specifier-led
Hafele	Premium European brand	Specifier-led, premium residential
Hettich	Predominantly cabinet hinges; some door range	Limited residential door
Cowdroy (legacy)	Heritage range, brass	Heritage and restoration
Whitco	Security hinges, sliding hardware	Mixed
AGB	Italian premium; concealed and fire-rated	Premium specifier
Sugatsune	Japanese precision hinges, concealed	Premium specifier

Common defects and on-site issues

Under-hung door (too few hinges or wrong size): a typical residential door with only two hinges instead of three warps within 6-12 months. Latch fails to engage. Refit with third hinge or larger hinges; sometimes the door is unrecoverable.
Wrong screw type or length: hinge screws supplied with the hinge are typically 25-32 mm. Using shorter screws (or chipboard screws) reduces holding power; the hinge pulls out of the frame under door weight.
Hinge mortise too deep: door binds against the frame; doesn’t close fully. Cause is over-routing the mortise. Pack with thin material behind the hinge or shim.
Hinge mortise too shallow: gap between door edge and frame; door doesn’t close cleanly. Re-route deeper.
Sagging door: top hinge takes most of the load; if top hinge screws are short or in low-quality timber (split, knot), the door sags. Replace top-hinge screws with longer (50-65 mm) into the stud behind the frame.
Settlement-induced bind: building movement after install changes the geometry slightly; door binds. Adjust by shimming or re-mortising.
Wrong-direction hinge for door swing: most butt hinges are reversible (handed by the side they’re screwed to), but some specialty hinges are left-hand or right-hand specific. Verify swing direction at order.
Non-fire-rated hinges in fire-rated assembly: invalidates the door’s FRL. The certifier should check; if missed, found at later compliance audit.
Mixed metals in coastal environment: brass hinges with steel screws in a coastal property cause galvanic corrosion. Use stainless 316 throughout in coastal exterior.

Pricing (2026 indicative, ex-GST, supply only, per hinge)

Item	Indicative cost
Steel zinc-plated 100 mm × 75 mm butt hinge	$6-12
Satin chrome / brushed nickel 100 mm × 75 mm	$10-22
Brass solid 100 mm × 75 mm	$25-55
Stainless 304 100 mm × 75 mm	$12-22
Stainless 316 100 mm × 75 mm	$20-40
Ball-bearing variant premium	+30-60% over fixed-pin
Security pin variant premium	+20-40%
Fire-rated hinge (Lockwood Fire)	$35-85
Concealed hinge (Soss, Tectus)	$80-280 per hinge
Pivot hinge (heavy duty)	$180-500 per hinge

A typical residential door uses three hinges, so total hinge cost is roughly $20-90 per door for standard residential; $250-800 for premium concealed.

Standards and references

Standards Australia, AS 4145.2:2008 Mechanical locks for doors used in buildings. https://store.standards.org.au (verified 2026-05-13).
Standards Australia, AS 1530.4:2014 Methods for fire tests on building materials. https://store.standards.org.au (verified 2026-05-13).
Standards Australia, AS 4290:2007 Plain and threaded screws. https://store.standards.org.au (verified 2026-05-13).
Australian Building Codes Board, NCC 2022 ABCB Housing Provisions Part 11 (Safe movement and access). https://ncc.abcb.gov.au/editions/ncc-2022/adopted/housing-provisions (verified 2026-05-13).