Galvanised Metric Structural Hex Nuts M12–M36

A structural connection deserves more than a nut that simply happens to thread onto the bolt. Bremick Structural Nuts are galvanised metric structural hex nuts available in M12, M16, M20, M24, M30 & M36 for compatible structural fastening assemblies across Australian steel fabrication, construction, industrial maintenance & heavy workshop applications.

For projects bringing the complete connection together,  Structural Fasteners & Bolts provides related structural hardware, while Bolts & Fasteners covers the wider fastening range.

Correct diameter is only the starting point. Structural bolt specification, metric thread compatibility, nut type, washer arrangement, galvanised finish & the requirements governing the connection should all be checked before installation.

What Are Structural Nuts?

Six external flats make these nuts easy to recognise, but their intended role separates them from everyday workshop hex nuts.

Bremick identifies this family as Structural Nuts Metric Galvanised, with documented sizes from M12 through M36.

Common Australian trade descriptions include:

► Structural nuts
► Structural hex nuts
► Metric structural nuts
► Galvanised structural nuts
► Structural bolt nuts
► Structural steel nuts
► High tensile structural nuts
► Metric coarse structural nuts
► Structural fastening nuts
► M12 structural nuts
► M16 structural nuts
► M20 structural nuts
► M24 structural nuts
► M30 structural nuts
► M36 structural nuts

Structural hardware should be identified by specification rather than appearance. A conventional hex nut may resemble a structural nut from across the workbench, but that doesn't establish suitability for a structural bolted connection.

For other nut & washer requirements around a fabrication shop or maintenance store, browse Nuts & Washers.

Why Choose Bremick Structural Nuts?

The real purchasing question is whether the nut belongs with the structural bolt assembly being installed.

Bremick's metric galvanised structural nuts provide a dedicated nut range for compatible structural fastening systems.

They can form part of requirements involving:

► Structural steel connections
► Fabricated steel frames
► Building structures
► Industrial supports
► Structural brackets
► Gantries
► Equipment frames
► Construction assemblies
► Heavy fabrication
► Maintenance replacement

Galvanising adds a protective finish to the nut. Where a connection calls for compatible galvanised structural hardware, the bolt, nut, washer & surrounding environment should be considered together.

A matching thread doesn't answer every compatibility question. Bolt specification, nut requirements, washer arrangement, coating & installation procedure can all influence the finished structural connection.

For a practical overview of how bolts, nuts & related hardware work together, read Fastener Guide Bolts Screws Anchors.

Common Applications

On a fabrication floor, structural nuts usually arrive as one component in a repeated connection rather than an isolated box of hardware.

Suitable structural fastening applications can include:

► Structural steelwork
► Steel-to-steel connections
► Fabricated frames
► Industrial structures
► Gantries
► Equipment support frames
► Structural brackets
► Building construction
► Heavy fabrication
► Maintenance replacement
► Compatible structural bolting
► Project-specific steel assemblies

Repeated fabrication work makes consistency particularly important. When dozens of connections share the same design, bolt diameter, nut type, washer arrangement & finish should remain aligned with the project requirements.

Replacement work starts from the opposite direction. Instead of ordering from a new drawing, crews may need to identify an existing bolt, nut & washer arrangement before the correct replacement hardware can be selected.

Exposed steelwork introduces another consideration. If the assembly specifies galvanised structural hardware, replacement components should be checked for finish compatibility rather than selected solely because the thread fits.

Product Selection Guide

Read the connection information first & open the fastener bin second.

Confirm The Nominal Metric Size

Structural nuts are identified around their mating thread rather than the width across the external hex.

Bremick currently documents:

A buyer replacing an M20 structural nut, for example, should begin by confirming the mating bolt is part of a compatible M20 structural assembly.

Don't identify the nut from external dimensions alone. Use the bolt, markings, drawing, specification or known assembly details to establish the nominal thread size.

Check The Complete Structural Fastener Assembly

One component can't confirm the specification of everything around it.

Before installation, check:

► Structural bolt type
► Nominal diameter
► Metric thread compatibility
► Structural nut requirement
► Washer arrangement
► Finish
► Connection design
► Tightening procedure
► Project documentation

Substitution deserves particular care. Where a drawing, engineer, fabricator or project specification nominates a particular structural fastening system, use components that meet those requirements rather than visually similar general-purpose hardware.

Understand Metric Coarse Terminology

Australian fastener catalogues commonly describe structural nuts using metric coarse terminology, but the actual thread still needs to be confirmed for the Bremick component being ordered.

Don't infer thread pitch solely from a generic product description.

For replacement or unidentified hardware, verify:

► Nominal diameter
► Thread pitch
► Mating bolt
► Product identification
► Project requirements

Where dimensions need to be checked before purchasing,  Measuring & Layout Tools can support workshop & site measurement tasks.

Consider The Galvanised Finish

Finish becomes part of the purchasing decision once structural steel moves into exposed service.

Bremick identifies these structural nuts as galvanised.

Compatible galvanised structural fastening may be considered across:

► Outdoor steelwork
► Industrial structures
► Exposed support frames
► Fabricated assemblies
► Construction steelwork
► Infrastructure-related applications

Keep the whole connection consistent with its specification. Nut finish should be considered alongside the structural bolt, washers, steelwork & operating environment.

Match The Washer Arrangement

A structural nut doesn't necessarily sit directly against the steelwork.

Depending on the connection, a specified washer arrangement may form part of the structural bolt assembly.

Check:

► Washer type
► Nominal size
► Position
► Finish
► Mating bolt
► Installation requirements

For related bearing washers across fastening work, browse  Flat Washer.

Choose Tools Around The Installation Method

M30 & M36 hardware changes the scale of the job considerably compared with ordinary workshop fasteners.

Use appropriately sized tooling for the nut & follow the installation procedure required for the structural connection.

For manual adjustment, assembly or maintenance work,  Spanner & Wrench Sets provide related fastening tools.

Where powered equipment is specified, follow the required tightening procedure rather than judging the completed connection from tool output alone.

Bremick Structural Nut Sizes M12–M36

Size-specific identification helps turn a vague request for “structural nuts” into an order the workshop can actually repeat.

M12 Structural Nut

Bremick's M12 galvanised structural nut is the smallest documented nominal diameter in this collection.

M16 Structural Nut

For compatible M16 structural fastening assemblies, Bremick provides an M16 metric galvanised structural nut.

M20 Structural Nut

An M20 galvanised structural nut is documented for compatible M20 structural bolting requirements.

M24 Structural Nut

Larger steel connections can move into Bremick's M24 metric structural nut where that diameter is specified.

M30 Structural Nut

The range continues with an M30 galvanised structural nut for suitable larger structural fastening assemblies.

M36 Structural Nut

Bremick's documented family reaches M36, providing a galvanised structural nut for compatible M36 metric structural hardware.

Clear bin labels make these sizes easier to manage. “M24 galvanised structural nut” tells the next fabricator considerably more than “large nuts”.

What Nut Fits An M20 Structural Bolt?

An M20 marking gives you the nominal diameter, but it doesn't finish the compatibility check.

Bremick offers an M20 metric galvanised structural nut within this range.

Before pairing it with an M20 structural bolt, confirm:

► Bolt specification
► Thread compatibility
► Nut requirement
► Washer arrangement
► Finish
► Project requirements
► Installation procedure

Diameter gets you to the right part of the fastener shelf. The structural assembly specification decides whether the components belong together.

For related structural bolt options, browse  Hex Bolts.

Structural Nut vs Standard Hex Nut

Two hexagonal nuts can sit side by side without being suitable for the same job.

Use the connection requirements to make the distinction. A standard hex nut shouldn't replace a specified structural nut merely because it turns freely onto the same nominal bolt diameter.

Structural Nuts, Bolts & Washers

Buying structural hardware as a connection rather than three unrelated line items reduces opportunities for mismatch.

A structural bolted assembly can involve:

► Structural bolt
► Structural hex nut
► Required washer arrangement
► Compatible metric thread
► Appropriate finish
► Installation method
► Tightening requirements
► Inspection requirements

Each component has a relationship with the next. A correctly selected nut can't compensate for an unsuitable bolt or an incorrect washer arrangement.

For broader guidance on why fastener selection matters beyond simply driving or tightening the hardware, read Why Good Fasteners Matter More Than the Tool You Drive Them With.

What About AS/NZS 1252?

Australian structural bolting work can involve AS/NZS 1252 requirements, but a standard shouldn't be assigned to a nut simply because it's sold as structural hardware.

Bremick's current product information for this collection identifies the range as metric galvanised structural nuts in M12, M16, M20, M24, M30 & M36.

Where project documents specifically nominate AS/NZS 1252 or another structural fastener standard, confirm the required bolt assembly & current manufacturer documentation before ordering, installing or substituting components.

The drawing & specification take priority over assumptions made from appearance.

Expert Tips

Photograph markings before removing unfamiliar structural hardware. A clear record of the original bolt, nut & washer arrangement can make later identification considerably easier.

Give structural fasteners their own labelled storage. Mixing them with ordinary hex nuts increases the chance of a visually similar component reaching the wrong assembly.

Write more than the diameter on the bin. “M20 galvanised structural nut” is far more useful to stores, purchasing & maintenance teams than “M20”.

Check threads before installation pressure is applied. Contamination, damage or incompatibility should be investigated rather than overcome with extra leverage.

Keep drawings or fastening schedules accessible during assembly. Correct hardware is easier to issue when crews can verify what each connection actually requires.

Watch for mixed finishes during replacement work. A matching thread doesn't automatically make an otherwise different component appropriate.

Escalate uncertain substitutions. When structural hardware doesn't match the documentation, confirm the requirement with the appropriate project or engineering authority before installation.

Maintenance teams working around heavy structures & industrial equipment can find additional practical context in Quarry Crews Crusher Maintenance.