Galvanised square twist nails for use with all types of builders metalwork. The twisted shank gives significantly improved pull-out resistance compared to a plain shank nail. Available in two sizes and multiple pack weights.
Available options and pricing for Square Twist Nail - Galvanised, with quantity selectors and a running total
Size
Weight
Pack Type
SKU
Price
QTY
Total
30 x 3.75mm
25kg
Carton
GST30
£49.87£59.84
—
40 x 3.75mm
25kg
Carton
GST40
£51.34£61.61
—
30 x 3.75mm
2.5kg
TIMtub
GST30T
£9.83£11.80
—
40 x 3.75mm
2.5kg
TIMtub
GST40T
£9.83£11.80
—
30 x 3.75mm
2.5kg
TIMbag
GST30LB
£8.78£10.54
—
40 x 3.75mm
2.5kg
TIMbag
GST40LB
£8.78£10.54
—
30 x 3.75mm
1kg
TIMbag
GST30B
£3.24£3.89
—
40 x 3.75mm
1kg
TIMbag
GST40B
£3.24£3.89
—
30 x 3.75mm
0.5kg
TIMbag
GST30MB
£1.82£2.18
—
40 x 3.75mm
0.5kg
TIMbag
GST40MB
£1.82£2.18
—
Galvanised square twist nails are a staple on any timber framing or metalwork job where a plain round nail just won’t hold. The twisted shank bites into the surrounding material as it’s driven home, creating a mechanical grip that resists withdrawal forces far better than a smooth shank — which matters when you’re fixing joist hangers, truss clips, or any other builders metalwork that’s going to be under load. These conform to Eurocode 5 and are rated for service class 2, so they’re suited to covered outdoor structures and general internal use where moderate moisture exposure is expected.
The galvanised coating gives medium-duty rust protection. Not the tool for permanently submerged or highly aggressive environments, but perfectly appropriate for the vast majority of structural metalwork applications you’ll encounter on site. Timber frame construction, roof trusses, joist hangers, restraint straps, truss clips — these nails are the right choice for all of it.
Where Galvanised Square Twist Nails Fit Into the Build
Builders metalwork is everywhere on a typical construction site, and a lot of it specifies twisted shank nails for a reason. Manufacturers of joist hangers, truss clips and strap hangers often call for them specifically because the pull-out resistance figures are higher and more consistent. Driving a plain nail into a light gauge steel fixing and then loading it up is the kind of shortcut that comes back to bite you at inspection — or worse, afterwards.
The square twist profile also helps with driving. It tends to track straighter than a round twisted shank, which is useful when you’re working at angles into pre-punched metalwork holes with a bit of pace on. Less skipping, less bending, fewer re-drives.
Pack Options Worth Knowing
These are available in 30 x 3.75mm and 40 x 3.75mm, with pack weights from 0.5kg up to a 25kg carton. The TIMbag and TIMtub options are handy for site use — the tub especially if you’re reaching in barehanded repeatedly and don’t fancy rooting around in a paper sack. For volume work, the 25kg carton is the sensible buy and the price per kilo reflects that.
Pro Tip: When nailing into light gauge steel joist hangers, keep your nail punch or hammer strikes clean and square to avoid bending the shank before it fully seats, a bent shank loses most of the pull-out resistance benefit.
These nails are used wherever builders metalwork meets timber on a construction project. Joist hangers, truss clips, restraint straps, framing anchors and hanger brackets all typically specify twisted shank nails in their fixing schedules. Timber frame construction, roof truss installation, floor cassette fitting and general structural carpentry are the most common applications. They're used by structural carpenters, groundworkers fitting beam supports, and general builders working to building regulations details that call out Eurocode 5 compliant fixings.
Best For
Joist hangers and truss clips
Restraint straps and framing anchors
Structural timber framing
Roof truss installation
General builders metalwork
Available In
30 x 3.75mm
40 x 3.75mm
0.5kg, 1kg, 2.5kg, 25kg weights
Carton, TIMbag, TIMtub pack types
Key Properties
Twisted shank for enhanced pull-out resistance
Galvanised for medium-duty rust protection
Conforms to Eurocode 5
Rated for service class 2
Square twist profile for straighter driving
Not suitable for: Not suitable for permanently wet or submerged environments, or applications requiring hot-dip galvanised or stainless fixings. Not intended for use in masonry or concrete.
Select the correct nail size for the metalwork manufacturer's fixing specification — using a shorter or thinner nail than stated will compromise the connection's load capacity. Use a hammer weight appropriate to the nail size; a 500g joiner's hammer works for the 30mm, but on the 40mm into dense timber you'll want a bit more behind it.
Drive the nail square and in one consistent motion where possible. The twisted shank engages best when driven cleanly rather than walked in with multiple light taps. When nailing through pre-punched holes in light gauge metalwork, make sure the nail is centred in the hole before striking to avoid deflection.
Check the metalwork fixing schedule or manufacturer's instructions for the specified nail size and quantity per fixing.
Select 30 x 3.75mm or 40 x 3.75mm based on the specification and the depth of timber available.
Position the joist hanger, strap or bracket correctly and hold or clamp it in place before nailing.
Place the nail through the pre-punched hole in the metalwork, ensuring it sits square to the timber face.
Drive the nail firmly and squarely in a single confident stroke where possible, avoiding glancing blows.
Check the nail head is flush with the metalwork surface — do not over-drive into light gauge steel.
Why do joist hanger manufacturers specify twisted shank nails rather than ordinary round wire nails?
Twisted shank nails have significantly higher pull-out resistance because the shank mechanically interlocks with the timber fibres as it's driven. In a loaded connection like a joist hanger, the forces trying to withdraw the nail are considerable, and a plain shank nail simply doesn't grip as reliably. Using the specified nail type also keeps the fixing compliant with Eurocode 5, which matters for building control sign-off.
Are these nails suitable for external use?
They carry a medium-duty galvanised coating and are rated for service class 2 under Eurocode 5, which covers covered external structures and internal environments with occasional moisture exposure. For fully exposed outdoor fixings or any application involving prolonged wet contact, you should look at a higher specification galvanised or stainless nail instead.
Galvanised square twist nails manufactured to conform to Eurocode 5 structural timber fixing standards, rated for service class 2 use. The twisted square shank profile provides mechanical pull-out resistance superior to plain shank equivalents. The galvanised coating offers medium-duty corrosion protection appropriate for sheltered external and standard internal applications. Available in 30 x 3.75mm and 40 x 3.75mm shank dimensions.
Sizes Available
30 x 3.75mm, 40 x 3.75mm
Pack Weights
0.5kg, 1kg, 2.5kg, 25kg
Pack Types
Carton, TIMbag, TIMtub
Shank Type
Square twist
Finish
Galvanised
Corrosion Protection
Medium duty
Standard
Eurocode 5
Service Class
2
Size
30 x 3.75mm, 40 x 3.75mm
Weight
0.5kg, 1kg, 2.5kg, 25kg
Pack Type
Carton, TIMbag, TIMtub
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