► Hobson | Washers

Reliable Load Distribution & Fastener Support for Trade Assemblies Which washer belongs under the bolt or nut you're specifying? Hobson | Washers covers professional washer solutions for construction, fabrication, engineering, maintenance & industrial fastening assemblies. The Hobson range extends beyond standard flat washers into spring washers, large OD washers, square...

Reliable Load Distribution & Fastener Support for Trade Assemblies

Which washer belongs under the bolt or nut you're specifying? Hobson | Washers covers professional washer solutions for construction, fabrication, engineering, maintenance & industrial fastening assemblies. The Hobson range extends beyond standard flat washers into spring washers, large OD washers, square washers, structural washers & specialist locking or load-indicating designs, with materials & finishes including 304 stainless, 316 stainless, zinc plated, yellow zinc plated & hot-dip galvanised options across relevant product families.

Building the complete fastening assembly? Start with Hobson | Bolts & Nuts, match associated hardware through Nuts & Washers & compare the wider range under Bolts & Fasteners. Selecting the washer alongside the bolt, nut, material being clamped & installation requirements is more reliable than treating it as an interchangeable finishing piece.

What Are Hobson Washers?

A washer sits between fastening components & the material or assembly being secured. Depending on its design, it may provide a bearing surface, distribute load, support the fastening arrangement or perform a more specialised function.

Hobson's current washer range includes multiple forms rather than a single universal washer:

► Standard flat washers
► Spring washers
► Large OD washers
► Cup washers
► Lock washers
► Structural washers
► Square washers
► Safety washers
► Belleville washers
► Load-indicating washers
► Direct tension indicating washers
► Two-piece locking washer systems

That variety matters because washer type is part of the fastening decision. A standard flat washer shouldn't automatically replace a structural, locking, spring or load-indicating product simply because the hole diameter appears suitable.

Hobson also supplies both metric & imperial washer configurations, so size identification needs to go beyond an approximate measurement across the fastener.

Why Choose Hobson Washers?

Washers rarely get the attention given to bolts, but an incorrectly selected washer can change how a fastening assembly bears against the connected material.

A standard flat washer can provide a broader bearing surface beneath a bolt head or nut. Other designs serve different purposes: Hobson describes spring washers as helping prevent loosening of bolted assemblies under vibration, while structural & load-indicating washer systems belong to more specialised fastening applications.

Hobson's range also gives buyers material & finish choices for different assembly requirements, including:

► 304 stainless steel
► 316 stainless steel
► Hot-dip galvanised steel
► Zinc plated steel
► Yellow zinc plated steel

The correct choice depends on the washer type, mating fasteners, environment, connected material & applicable project specification.

Working with less conventional fastening requirements? Specialty Fasteners & Fixings provides another pathway for application-specific hardware.

Common Applications

Fabricating a bracket or equipment mount? A correctly sized flat washer can provide a suitable bearing surface beneath the associated fastener where that washer type is appropriate for the assembly.

Maintenance teams frequently face a different problem: a washer has disappeared during disassembly & the replacement needs to be identified from the bolt, nut & original connection. Checking the fastener size, washer dimensions, material & type is safer than reaching for the closest washer in the parts drawer.

Construction connections can require much more specific hardware. Structural assemblies may nominate particular washer types, dimensions, material properties or installation procedures that shouldn't be replaced with general-purpose products.

Machinery & equipment introduce vibration into the conversation. Where loosening resistance forms part of the design, use the washer or locking arrangement actually specified for the connection rather than assuming any spring washer will solve the problem.

Corrosive or exposed environments shift attention toward material & finish. Hobson's 304 & 316 stainless options provide choices for stainless fastening assemblies, while coated steel products suit other specified applications.

For construction connections where bolt assemblies carry more demanding requirements, browse Structural Fasteners & Bolts.

Product Selection Guide

Identify What the Washer Needs to Do

“It's an M8 bolt” isn't enough information to choose every washer.

First establish the washer's role within the connection. Does the assembly require a standard bearing washer, a larger outside diameter, a spring design, a square profile or a specialised structural or locking solution?

That question immediately narrows the range more effectively than choosing by internal diameter alone.

Match the Washer to the Fastener Size

The washer's internal diameter needs to accommodate the specified fastener while the outside diameter & thickness affect the bearing area & physical fit within the assembly.

A verified Hobson 304 stainless DIN 125A M8 flat washer, for example, is listed with approximately:

► 8.5 mm ID
► 16 mm OD
► 1.6 mm thickness

A verified 316 stainless M6 flat round washer is listed with:

► 6.5 mm ID
► 12 mm OD
► 1.2 mm thickness

Those examples demonstrate why the nominal bolt size shouldn't be mistaken for every physical washer dimension.

Standard or Large OD?

More outside diameter means a larger bearing footprint, but bigger isn't automatically better.

Large OD washers can be useful where the assembly requires increased bearing area or where the specified connection calls for that washer form. Clearance around the fastener, connected material & design requirements still need consideration.

Don't substitute a large OD washer simply because it looks more substantial.

Flat or Spring Washer?

These products shouldn't be treated as two thickness options for the same job.

Flat washers commonly provide a bearing surface within a bolted assembly.

Hobson identifies spring washers as products intended to help prevent loosening under vibration. Its current range includes flat-section & square-section spring washers across metric & imperial configurations.

The correct arrangement should still follow the fastening design, equipment requirements or applicable specification.

304 or 316 Stainless?

Both are stainless steels, but that doesn't make them interchangeable in every application.

Hobson supplies washer products in 304 stainless & 316 stainless. Material selection should consider the environment, mating fasteners, corrosion requirements & project specification.

Where a 316 stainless fastening system has been nominated, check the bolt, nut, rod & washer together rather than introducing a different material without understanding the implications.

Coated Steel Needs the Same Attention

Not every Hobson washer is stainless.

The current range also includes finishes such as zinc plated, yellow zinc plated & hot-dip galvanised across relevant washer types. Match the washer finish with the fastening system & service environment rather than choosing solely on appearance.

Structural Washers Are a Separate Decision

A structural connection isn't the place for an approximate washer substitution.

Structural washers can form part of specified bolted assemblies where dimensions, material properties & installation requirements matter. Follow the relevant project documentation & fastener specification instead of replacing a structural washer with a standard flat washer of similar diameter.

Washer Types – Which One Fits the Application?

Different shapes exist because different connections create different requirements.

Washer Type

Typical Role

Selection Focus

Flat Washer

Provides a bearing surface

ID, OD, thickness, material & specification

Large OD Washer

Provides increased bearing area where required

Fastener size, OD, thickness & substrate

Spring Washer

Used in specified assemblies where resistance to loosening is required

Section, size, material & assembly

Square Washer

Provides a square bearing profile

Dimensions, hole size, thickness & application

Structural Washer

Used with specified structural fastening systems

Standard, bolt system & connection specification

Load-Indicating Washer

Supports specialised bolt-tension applications

Fastening system & installation procedure

The safest buying question isn't “Which washer looks right?” It's “Which washer is required by this fastening assembly?”

Expert Tips

Keep the Old Washer Until the Replacement Arrives

An unidentified washer can provide useful evidence.

Before discarding it, record the inside diameter, outside diameter, thickness, profile, material or finish & associated fastener size. That information can dramatically narrow the replacement search.

Accurate dimensions matter when similar products are involved. Measuring & Leveling Tools can support workshop identification & checking.

Look at the Bearing Surface

A washer interacts with more than the bolt.

Inspect the material beneath it. Slotted holes, oversized holes, thin material, coatings or fabricated components may create requirements that differ from a straightforward bolted connection.

If the assembly is engineered or specification-sensitive, follow the nominated washer arrangement.

Don't Stack Washers to Invent a Specification

Missing the required thickness or washer type?

Building an improvised stack of unrelated washers isn't automatically equivalent to the specified component. Multiple washers can alter the assembly geometry & shouldn't be used as a substitute for a nominated product without appropriate justification.

Separate Stainless & Coated Stock

A mixed container full of similar-looking washers makes material identification unnecessarily difficult.

Keep 304 stainless, 316 stainless, zinc plated, galvanised & specialist washers labelled separately where those materials are stocked together.

Small Parts Organisers can help keep common washer sizes & finishes identifiable in the workshop or service vehicle.

For broader consumable preparation, Spring Jobsite Prep Getting Your Gear Ready covers practical checks before work ramps up.

Check Both ID & OD

Two washers for the same nominal bolt size can have different outside dimensions.

Checking only the centre hole can therefore lead to the wrong bearing area, clearance or physical fit. Record ID, OD & thickness when replacing an unfamiliar washer.

Keep Stainless Assemblies Consistent

A stainless washer is only one part of the connection.

Review the material of the bolt, nut, threaded rod & surrounding components where corrosion resistance matters. Mixing materials without considering the environment can undermine an otherwise carefully specified assembly.

The wider principle is covered in Why Good Fasteners Matter More Than the Tool You Drive Them With.

Don't Assume Every Spring Washer Solves Vibration

Vibration-related loosening is a fastening-system problem, not a reason to add whichever locking washer happens to be nearby.

Hobson offers multiple washer & locking technologies. Use the arrangement specified for the joint, particularly on machinery, structural connections or safety-sensitive equipment.

Treat Specialist Washers as Specialist Components

Load-indicating, structural, Belleville & two-piece locking washers shouldn't be reduced to generic accessories.

Their geometry or operating principle can be part of how the fastening system performs. Confirm the product, installation requirements & mating fasteners before substitution.

For more fundamentals around bolts, screws, anchors & fastening selection, read Fastener Guide Bolts Screws Anchors.

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Why Buy From Industrial Shed?

The washer is inexpensive compared with the labour involved in discovering the wrong one after an assembly reaches site. Industrial Shed supplies Hobson fastening products for Australian construction, fabrication, maintenance, engineering & workshop applications, making it easier to source washers alongside the bolts, nuts & related components they support.

Managing recurring fastener consumption across workshop bins, service vehicles or site stores? on-site & workshop Services can help with broader restocking requirements.

Need a washer checked against a less familiar fastening requirement? Trade support Solutions gives professional buyers another pathway to Industrial Shed support.

Good fastening decisions are rarely about one component in isolation. A tool is not just a tool. It’s a promise. looks at the wider value of dependable professional equipment & supplies.

Put the Right Washer Into the Assembly From the Start

Before adding another box of washers to the order, identify what the connection actually requires: fastener size, washer type, ID, OD, thickness, material, finish & application.

That extra check is particularly valuable when several washers share the same nominal bolt size but differ in outside diameter, section, material or purpose.

Choose Hobson Washers around the complete fastening assembly so the washer arriving on site matches the bolt, connection & working environment.

Frequently Asked Questions

Start with the fastener size, then check the washer type, ID, OD, thickness, material, finish & requirements of the complete connection.

A flat washer primarily provides a bearing surface. Hobson identifies spring washers for use in bolted assemblies where resistance to loosening under vibration is required.

Not necessarily exactly 8 mm. For example, Hobson's verified DIN 125A M8 stainless flat washer has an approximately 8.5 mm internal diameter to accommodate the M8 fastener.

Yes. Hobson's current range includes washer products in both 304 & 316 stainless steel, along with coated steel options across relevant product families.

Use one where increased bearing area or that washer geometry is appropriate for the connection. Check the fastener, connected material, clearance & specification rather than automatically upsizing.

Not simply because the dimensions look similar. Structural fastening assemblies should use the washer type & specification required by the connection design.

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Hobsons

Hobsons

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