Buy Safety Washers Online in Australia
Safety Washer Selection — Quick Reference
Safety washers — LOCKING + ANTI-VIBRATION + tamper-resistant washer designs to PREVENT FASTENER LOOSENING from vibration + thermal cycling + dynamic loads. Workshop + automotive + industrial machinery applications.
| Safety Washer Type | Best For |
|---|---|
| Spring Lock Washer (DIN 127) | General workshop — see spring washers |
| Internal Tooth Lock Washer | Higher locking + smaller bore |
| External Tooth Lock Washer | Higher locking + electrical earth |
| Wedge Lock Washer (Nord-Lock) | Heavy vibration + extreme — see wedge-lock |
| Disc / Belleville Spring | High pre-load + tolerance take-up |
| Conical Spring Washer | Heavy spring action |
| Serrated Flange | Combined with hex nut |
Critical: Spring washers ALONE INADEQUATE for severe vibration — use wedge-lock for safety-critical joints. Replace single-use designs each assembly. Match to bolt grade + finish. Companion: washers, spring lock, wedge lock, fasteners.
Safety Washers for Australian Engineering and Maintenance
Safety washers are the locking washers that prevent bolted joints from loosening under vibration, dynamic load, and thermal cycling. Different from spring washers and split lock washers (which provide modest vibration resistance), safety washers use cam, serration, or conical-spring geometries that lock the joint mechanically. AIMS Industrial supplies safety washers including the Schnorr serrated range and complementary locking systems for Australian engineering and maintenance work.
The safety washer types we stock
- Schnorr serrated safety washers — German-engineered conical washers with serrated faces; the premium safety washer choice
- Nord-Lock wedge-locking washers — Swedish-designed washer pairs that prevent rotation through wedge geometry
- Internal star washers — teeth bite into the joint material; for small fastener applications
- External star washers — teeth bite into the bolt head; for general locking applications
- Internal/external combination star washers — both internal and external teeth for maximum grip
- Conical spring washers (Belleville) — for spring-loaded fastening that maintains tension as joints relax
Where safety washers earn their place
- Vibrating equipment — pumps, motors, gearboxes where standard spring washers don't hold
- Heavy machinery — earth-moving, mining, agricultural equipment subject to constant shock loading
- Vehicle chassis — automotive, truck, and trailer fastenings exposed to vibration and thermal cycling
- HVAC plant — fan and motor mountings, ducting connections subject to ongoing vibration
- Critical safety fixings — anywhere joint loosening would create a safety risk
Choosing the right safety washer
- Schnorr serrated — for general vibration resistance with serviceable joints; widely used premium choice
- Nord-Lock — for the highest vibration resistance; mechanically prevents rotation
- Star washers — economical for light-duty locking on smaller fasteners
- Conical spring — for joints where spring-loaded fastening maintains preload as the joint settles
Why standard spring washers often fail
Conventional split-ring spring washers provide modest spring force but limited rotation resistance. Under sustained vibration, they can fully relax (squashed flat) and provide essentially no locking function. For serious vibration applications, a proper safety washer (Schnorr or Nord-Lock) is the right specification — the cost difference is small against the cost of a single fastener loosening in service.
Materials and finishes
- Spring steel (zinc-plated) — the everyday workshop choice
- Stainless steel 304 or 316 — for corrosive and food-contact environments
- Geomet or surface-treated — for premium corrosion resistance
Companion ranges at AIMS
Safety washers sit alongside our broader fastener range — see Schnorr, Nord-Lock, retaining washers, and mudguard washers for the related products.
Need help selecting safety washers for a specific application or vibration concern? contact our team — we'll match by load, vibration severity, and service environment.
People Also Ask — Safety Washers
Q: What actually makes something a 'safety washer' rather than an ordinary spring washer?
Safety washers use cam, serration, or conical-spring geometries that lock the joint mechanically, rather than the modest spring tension a standard split spring washer or lock washer relies on — that mechanical lock is what makes them the right step-up for joints where a spring washer alone isn't enough.
Q: What's an internal/external combination star washer used for?
It combines both internal teeth (biting into the bolt head or nut) and external teeth (biting into the mating surface) on the one washer, for applications that need maximum grip from both directions rather than just one.
Q: What's Geomet coating, and why would I choose it on a safety washer?
Geomet is a surface treatment offered as an alternative to plain zinc-plated spring steel or stainless steel, giving premium corrosion resistance where the everyday zinc-plated finish isn't durable enough for the service environment.
Q: Why do HVAC plant fan and motor mountings need safety washers rather than standard spring washers?
Fan and motor mountings and ducting connections are subject to ongoing vibration in service, which is exactly the condition standard spring washers handle poorly — a mechanically-locking safety washer holds where continuous vibration would otherwise walk a standard washer loose over time.
Q: Do I need a different safety washer material for food-contact or marine environments?
Yes — stainless steel 304 or 316 safety washers are stocked specifically for corrosive and food-contact environments, as an alternative to the standard zinc-plated spring steel used for everyday workshop applications.