Secure Fastening, Reliable Clamping & Machinery Maintenance

A dependable bolted joint relies on more than a correctly sized bolt. The right locknuts & washers help support secure fastening arrangements, provide suitable bearing surfaces & maintain specified clamping conditions across machinery, fabrication & industrial maintenance applications.

Industrial Shed's Locknuts & Washers collection helps Australian tradespeople, engineers & maintenance teams identify compatible fastening components. Whether you're replacing worn hardware, assembling equipment or repairing machinery, start with the bolt specification, joint requirements & operating environment.

Choose the Right Locknut or Washer

Different fastening components perform different functions.

• Nylon-insert locknuts: use a non-metallic insert to provide prevailing torque where approved.

• All-metal locknuts: provide a mechanical locking arrangement without a nylon insert.

• Flat washers: create a defined bearing surface beneath suitable nuts or bolt heads.

• Hardened washers: suit specified high-strength fastening assemblies requiring appropriate washer hardness.

• Stainless-steel washers: offer selected material options where corrosion resistance is important.

• Special-purpose washers: may provide spacing, sealing or other functions in approved assemblies.

Not every design is necessarily stocked in this collection. Check the individual product listing before selecting a locking mechanism, material or washer standard.

For a closely related product range, browse Flat Washers & compare dimensions, materials & applicable specifications.

Metric & Imperial Sizes, Thread Pitch & Washer Dimensions

Correct sizing is essential for a compatible fastening assembly.

A locknut with the wrong thread pitch may damage a bolt, while a washer with unsuitable dimensions or hardness may not provide the required bearing characteristics.

Before purchasing, compare:

• Thread diameter: confirm the required metric or imperial size.

• Thread pitch: match the bolt's exact thread specification.

• Locking mechanism: identify the specified nut design.

• Nut dimensions: check height, width & installation clearance.

• Washer inside diameter: confirm fit around the fastener.

• Washer outside diameter: check the required bearing area.

• Washer thickness: match the applicable standard or joint design.

• Material grade: verify compatibility with the bolt & application.

• Surface finish: assess the required corrosion protection.

A nominal M10 washer, for example, may be available in different standards & outside diameters. The thread or bolt designation alone does not establish the correct washer.

Where possible, match the original manufacturer part number or recognised fastener standard.

Nylon-Insert vs All-Metal Locknuts

Locknuts use different methods to resist unintended rotation.

Nylon-insert locknuts incorporate a polymer insert that produces prevailing torque during installation. Their suitability depends on temperature, chemical exposure, thread condition & the manufacturer's requirements.

All-metal locknuts use a metallic locking feature. Some designs may suit applications where a non-metallic insert is unsuitable, provided the exact product is approved.

Neither locking arrangement compensates for incorrect bolt preload or poor joint design.

For machinery exposed to vibration, shock loading or repeated servicing, confirm the specified locking method, tightening procedure & replacement requirements.

A previously installed prevailing-torque nut should not be assumed reusable. Follow the manufacturer's guidance.

Flat Washers, Hardened Washers & Load Distribution

Washers can provide a suitable contact surface between a fastener & the material being clamped.

Flat washers are commonly selected where the joint specification requires a defined bearing surface or spacing arrangement.

Hardened washers may be required for particular high-strength bolt assemblies.

Stainless-steel washers may suit selected environments where their material grade provides appropriate corrosion resistance.

A larger washer does not automatically improve a joint. The correct inside diameter, outside diameter, thickness, hardness & material depend on the assembly design.

When replacing washers, compare the existing component against the specifications in the Flat Washers collection.

For structural or safety-critical connections, use the specified fastener assembly rather than substituting generic hardware.

Materials, Finishes & Corrosion Resistance

Fastening hardware may be exposed to moisture, vibration, chemicals or temperature changes.

Common considerations include:

• Zinc-plated steel: provides a protective finish for suitable environments.

• Stainless steel: offers corrosion resistance according to its grade & exposure conditions.

• Plain steel: may suit applications where the specified joint design permits it.

• Hardened steel: may be required for selected high-strength fastening arrangements.

Stainless steel should not be assumed equivalent in strength to high-tensile carbon steel.

Where dissimilar metals are used together, assess the risk of galvanic corrosion under relevant environmental conditions.

For outdoor machinery or chemically exposed installations, confirm the manufacturer's material recommendations.

Locknuts & Washers for Machinery, Fabrication & Repairs

Machinery maintenance: compatible locknuts & washers support approved replacement & reassembly procedures.

Metal fabrication: fastening hardware may be used in bolted frames, brackets & equipment assemblies.

Automotive maintenance: replacement nuts & washers must match the equipment manufacturer's specifications.

Agricultural equipment: vibration, moisture & contamination may influence the required locking arrangement.

Industrial assembly: standardised fastener specifications help maintenance teams identify suitable replacement components.

For a replacement assembly, check whether both the nut & washer require replacement. If a washer is damaged or distorted, compare the appropriate dimensions in Flat Washers before ordering.

Installation, Torque & Fastener Safety

• Confirm the bolt, nut & washer specifications before assembly.

• Inspect threads, contact surfaces & hardware for damage.

• Follow the required tightening sequence & torque procedure.

• Account for prevailing torque where specified.

• Check whether the locknut is approved for reuse.

• Avoid mixing incompatible thread standards or material grades.

• Replace distorted, damaged or excessively worn components.

• Follow engineering requirements for critical fastening assemblies.

A locknut does not replace correct bolt preload.

Incorrect lubrication, damaged threads or unsuitable washers can affect the relationship between tightening torque & joint clamping force.

If a joint repeatedly loosens, investigate the loading, vibration, assembly method & component compatibility rather than simply fitting a different locknut.

Locknuts & Washers FAQs

What Is the Difference Between a Locknut & a Standard Nut?

A locknut incorporates a locking feature intended to resist unintended rotation. A standard nut does not necessarily include that additional mechanism.

Can Nylon-Insert Locknuts Be Reused?

Only where reuse is permitted by the manufacturer or applicable maintenance procedure & the required locking performance remains acceptable.

Are Flat Washers & Spring Washers Interchangeable?

No. They have different designs & functions. Use the washer specified for the joint.

How Do I Choose the Correct Locknut & Washer Size?

Match thread diameter, pitch, material grade, washer dimensions, locking method & applicable manufacturer specifications.

Industrial Shed Support

Industrial Shed supplies fastening hardware, mechanical components & workshop essentials to Australian trade & industrial customers. Check Shipping & Delivery for delivery arrangements. For replacement-part enquiries or assistance identifying compatible hardware, visit Warranty & Parts Support.