Nails for residential construction: types, gauges, and when to use them

TL;DR

Australian residential framing runs almost entirely on collated gun nails: Paslode and Senco platforms take 75 mm and 90 mm D-head or round-head nails at 30 to 34 degrees, in standard or ring-shank, bright or HDG. Hand nails (75 x 3.15 mm bullet head, 90 x 3.75 mm) still have a place for spot repairs, finishing, and connections the gun can’t reach, but they’re a small share of any modern framing job. Coating matters more than most builders think: bright steel is for internal dry work only; hot-dip galvanised (HDG) is the default for any exposed or external fixing; stainless 316 is required within 1 km of a surf coast or 100 m of a sheltered bay (AS 4312:2019 corrosivity zones C4/C5). Wrong nail in a wet location is a corrosion and structural defect.

What it is

A nail is a steel wire fastener, formed with a point, a plain or profiled shank, and a head. Australian residential construction nails are specified by:

Head type: bullet head (small, can be punched flush) or flat head (broad bearing surface, no punching)
Shank type: smooth, ring-shank (annular rings for pull-out resistance), or screw/twist
Size: expressed as length x diameter in mm (e.g. 75 x 3.15 mm)
Coating/material: bright (uncoated), zinc-plated, hot-dip galvanised (HDG), or stainless steel

The primary Australian standard for nail dimensions is AS 2334-1980 (Reconfirmed 2015), Steel nails (Metric series), which covers bullet head, flat head, clout, plasterboard, fibre cement sheet, roofing, and other types (verified 2026-05-08, Standards Australia store listing).

AS 1684.2:2021 (residential timber framing) contains the nail fixing schedule for framing connections. It specifies nail diameters, minimum lengths, and quantities for each connection type (stud to plate, rafter to wall plate, etc.). These are engineered requirements, not suggestions (verified 2026-05-08, AS 1684 standard description).

Properties

Standard hand nail sizes

Size (L x dia.)	Common name	Typical use
50 x 2.80 mm	Small bullet head	Internal lining battens, light noggings, packing
75 x 3.15 mm	Standard framing nail	General timber-framing connections, stud to plate, non-structural
75 x 3.75 mm	Heavy bullet head	Structural connections, higher shear load
90 x 3.75 mm	90 mm framing nail	Primary structural framing: stud to bottom plate, rafter connections, joist hanger backing
100 x 4.50 mm	Large framing nail	Heavy structural: tie-down areas, bearer connections

Sizes confirmed against Australian supplier product listings (Paslode, Allfasteners, BST Group) (verified 2026-05-08).

Common collated gun nail sizes

Size (L x dia.)	Collation	Head	Typical use
75 x 2.87 mm	34 degree	D-head or round	Framing, stud-to-plate, lighter structural
75 x 3.06 mm	34 degree	D-head	Framing, studs, noggings
90 x 3.06 mm	34 degree	D-head	Structural framing: rafter-to-plate, bottom plate to bearer
90 x 3.15 mm	30 degree	Round head	Higher-hold structural; round-head nailers
65 x 2.5 mm	15 degree coil	Flat head	Cladding, fibre cement sheet, LVL

Gun nail diameters confirmed from Paslode Australia and Senco distributor specifications (verified 2026-05-08). Always match the collation angle to your nailer magazine: a 34-degree nail will not feed reliably in a 21-degree magazine.

Fibre cement (soft sheet) nails

Size	Type	Finish	Use
30 x 2.8 mm	Flat clout head	Galvanised	FC sheet to timber batten (internal and sheltered external)
50 x 2.8 mm	Flat clout head	Galvanised	FC sheet to timber frame (external weatherboard zone)
30 x 2.8 mm	Flat clout head	316 stainless	Coastal / C4-C5 zones
50 x 2.8 mm	Flat clout head	316 stainless	Coastal / C4-C5 zones

Specifications confirmed against Paslode Bunnings listing and Otter/Airco stainless range (verified 2026-05-08).

Grades and variants

Bullet head vs flat head

Bullet head: small, rounded head that can be punched below the timber surface with a nail punch. Used where appearance matters (internal lining, architrave, skirting) or where a flush finish is needed before plastering. The AS 1684 general nailing schedule commonly specifies bullet head nails for framing connections. Confusingly, some building manuals call these “flat head nails” because the face is flat even though the head profile is small. Manufacturer product sheets (Paslode, BST Group) and supplier catalogues consistently label the small-head framing nail “bullet head” (verified 2026-05-08).

Flat head (clout): large, broad head with good pull-through resistance. Used for roofing, fibre cement sheet, sarking, and any sheeted substrate where pull-through is the failure mode rather than withdrawal. Plasterboard nails are a variant of flat head clout nails.

Smooth shank vs ring shank

Smooth shank: the default for most framing applications. Easy to drive, adequate holding power in dry-framing conditions. Specified in AS 1684 general nailing schedules (verified 2026-05-08).

Ring shank (annular ring): annular rings machined into the shank create a mechanical interlock with the timber fibres. Superior pull-out resistance compared to smooth shank. Ring shank nails are appropriate for decking, subfloor fixings, areas subject to cyclic loading, and anywhere vibration or foot traffic could work a smooth nail loose over time. Paslode ring shank gun nails in 75 mm are available in HDG for above-ground deck framing.

Screw/twist shank

Helical twist machined into the shank. Better holding power in hardwood and green timber than smooth shank. Less common in residential framing; primarily used in pallet and hardwood-decking applications.

Where to use

75 x 3.15 mm bullet head (bright or galv): general internal framing connections where AS 1684 specifies a 3.15 mm diameter nail
90 x 3.75 mm bullet head (HDG): structural framing connections in roof framing, wall frames, any location that may see occasional moisture during construction
Collated D-head or round-head gun nails 75–90 mm (HDG): all gun-nailed framing; HDG coating is recommended even for internal framing because construction-phase weather exposure is unpredictable
Ring shank nails (HDG): decking, subfloor, any connection where vibration or cyclic load is present
Clout/flat-head nails 30–50 mm (galv or 316 SS): fibre cement sheet, sarking, roofing underlays to battens
316 stainless steel (any type): all fixings in C4/C5 corrosivity zones (coastal, marine); plunge pools, wet-area framing where chemical exposure is possible

Where NOT to use

Bright (uncoated) nails in any external or exposed location. No zinc coating, no corrosion protection. Rust staining on cladding and structural degradation at connection points will follow.
Zinc-plated (electro-galvanised) nails in external applications. The zinc layer is too thin (approximately 5 microns) for outdoor service life in Australian conditions. Use HDG as the minimum for external fixing.
HDG nails in C4/C5 corrosivity zones. Within 1 km of a surf coast or 100 m of a sheltered bay, HDG service life is materially reduced. Use 316 stainless for all structural fixings (AS 4312:2019 zone guidance, verified 2026-05-08).
Smooth-shank nails for decking. Foot traffic and seasonal movement work smooth nails loose over time; ring shank is the correct specification.
Mixing gun-nail collation angles. A 34-degree collated nail strip will jam or misfire in a 21-degree nailer magazine. Check the tool and nail angle match before loading.
Galvanised nails in contact with CCA-treated timber in wet conditions. CCA (copper chrome arsenate) treatment is corrosive to standard galvanising; stainless steel or suitable hot-dip galvanised fasteners rated for the application are required. Confirm with the timber treatment data sheet.

Fixing and installation

AS 1684 fixing schedule

AS 1684.2:2021 Appendix / fixing schedule tables specify for each framing connection type:

minimum nail diameter (mm)
minimum nail length (mm)
minimum nail count
any specific nail type requirements (e.g. minimum diameter for laminated members)

For example, the standard specifies that nails for vertical nail lamination of members shall be a minimum of 2.8 mm in diameter and shall be staggered (verified 2026-05-08 from AS 1684 documentation). For standard stud-to-plate connections, 2 x 75 mm nails minimum is a common fixing requirement, but always confirm from the current AS 1684.2 fixing schedule rather than from memory or older editions.

Do not substitute smaller nails or fewer nails than the schedule requires. The schedule is engineered: each fixing is calculated for the load path, wind classification, and connection geometry. Substitutions are a structural non-compliance.

Hand nailing

Drive at a slight angle to the vertical (skew-nail) where direct face-nailing would split the timber
For stud-to-plate: skew-nail 2 to 4 nails through the stud face into the plate
Set bullet heads fractionally below the timber surface with a nail punch before lining
Do not over-drive; sinking the head too deep reduces the shear capacity of the connection

Nail gun use

Load the correct collation angle for your nailer (30, 34, or 21 degree)
Check the timber surface is solid before driving; gun nails driven into notched or drilled-out zones can push through to the void
In treated pine (H2, H3), gun nails drive well; confirm the nail coating is compatible with the treatment level on the docket
Dry-fire prevention is a safety feature, not an optional setting. Keep it engaged.

Storing nails

Store in dry, sealed containers; loose bright nails exposed to condensation will rust within days on a damp site
HDG nails resist site moisture well but should not be stored in contact with concrete or CCA-treated offcuts for extended periods
Pre-loaded gun nail strips: keep in the manufacturer’s packaging until use on site

Tolerances and acceptance

Connection compliance

Nail count and diameter must match the AS 1684.2 fixing schedule for every connection type
Nails driven at more than approximately 30 degrees off perpendicular lose shear capacity; flag for the framing certifier if widespread oblique driving is observed
Missing nails in roof tie-down connections and cyclone tie installations are a stop-work issue; these connections are structural life-safety elements

Surface finish (visible framing)

Bullet heads in internal framing do not need to be perfectly punched at framing stage, but must be set flush or below before lining goes on
Rust staining from bright nails left exposed through wet weather is a cosmetic defect; staining that bleeds through plasterboard or cladding after lining is a workmanship defect
Nails within approximately 25 mm of the edge of a structural member should be checked for splitting; hairline surface splits are generally acceptable, but through-splits on load-bearing members are not

Tolerances (HIA Guide values)

Per current HIA Guide to Materials and Workmanship: specific pull-out resistance acceptance values and framing connection nail-count verification tolerances for inspections are not currently available without HIA membership access. [HIA-069]

Working with other trades

Framing carpenter (chippy): responsible for driving all structural framing nails per the AS 1684 fixing schedule; must confirm nail size, count, and coating from delivery dockets
Builder / site manager: responsible for specifying the correct nail for each zone (internal, external, coastal); should call out nail type in the frame specification document or site instruction
Building certifier: may inspect fixing schedule compliance at frame inspection stage; missing or wrong-gauge nails at tie-down connections are a mandatory-hold item
Waterproofer / plumber: services penetrations through framing must avoid the nail lines for structural members; over-notching adjacent to nails further weakens the section

Health and safety

Struck cap / ricochet: never drive nails into hard knots, embedded hardware, or plate anchor bolts. Gun nails fired into metal deflect unpredictably. Confirm path is clear before driving.
Eye protection: mandatory for all hand and gun nailing. Ricochet fragments from knots or misdrives are a standard site hazard.
Manual handling: hammering at height or in awkward framing positions loads shoulders and wrists. Use a straight-handle framing hammer, correct weight for the task; minimise overhead nailing where possible.
Nail gun recoil and contact tip: keep the contact tip clear of hands, legs, and other trades during use. Bump-fire mode on some nailers allows rapid unintentional discharge. Use sequential-fire mode when working close to other people or in confined framing bays.
CCA-treated timber: as noted under “Where NOT to use”, confirm fastener-treatment compatibility before selecting nails for ground-contact or chemical-hazard zones.

Suppliers

Paslode Australia: leading collated gun nail range (IM350+, IM360Ci, 360Xi platforms); 75 mm and 90 mm D-head and ring-shank in bright and HDG; fibre cement range at Bunnings and Trade
Senco: 34-degree HDG and ring-shank framing nails; cladding coil nails; available through Airco Brands and major trade outlets
Allfasteners Australia: hand nail range including bulk 15 kg boxes of bullet head; trade and wholesale supply
BST Group: bulk framing and ring-shank nail supply, Australia-wide
Suncoast Bolts and Fasteners: 316 stainless bullet head and fibre cement range for coastal Queensland builders

[Sponsor or preferred supplier slot. ACCC disclosure required.]

What can go wrong

Bright nails used externally or in wet zones: rapid corrosion at connection points; rust staining through cladding; shank cross-section loss reduces structural capacity over time
Under-nailing in fixing schedule: fewer nails than the AS 1684 schedule requires means the connection is not structurally compliant; common at roof-to-wall connections where speed takes over
Wrong collation angle in gun nailer: nail strips jam or misfeed; the nailer fires partially, leaving nails proud; on a busy frame this can go unnoticed until the certifier checks
HDG nails in C4/C5 zones: galvanising degrades faster than expected; in 10 years, connections in direct coastal exposure with only HDG show measurable shank corrosion
Smooth shank in decking: nails back out over time from foot traffic and seasonal timber movement; deck boards lift and squeak within 2 to 3 years
Over-nailing at plate joints: too many nails too close together in a plate end-to-end joint splits the timber; maintain minimum edge distances (typically 10 to 15 mm from the end)
CCA compatibility failure: standard galvanised nails in contact with CCA-treated timber in wet/ground conditions accelerate galvanic corrosion; stainless steel or specifically rated HDG required per the treatment data sheet

References

AS 2334-1980 (Reconfirmed 2015), Steel nails (Metric series) (Standards Australia) (verified 2026-05-08)
AS 1684.2:2021 Amd 1:2024, Residential timber-framed construction, Part 2: Non-cyclonic areas (Standards Australia) (verified 2026-05-08)
AS 4312:2019, Atmospheric corrosivity zones in Australia (Standards Australia) (verified 2026-05-08)
Paslode Australia, nail product range and specifications (paslode.com.au) (verified 2026-05-08)
AGrade Fasteners, finish types and corrosivity zone service life (agradefasteners.com.au) (verified 2026-05-08)
HIA Guide to Materials and Workmanship (national, Housing Industry Association) (tolerance values pending HIA member access)