Starlock Washers are a highly efficient type of push-on fastener used to permanently grip smooth, unthreaded cylindrical shafts. Unlike standard washers that sit under a nut to distribute pressure, Starlock washers function as standalone retaining clips that bite deeply into a shaft to prevent components from working loose.
Here is a comprehensive breakdown of how they work, their key variations, and where they are most commonly used.
Starlock Washers feature a unique, angled internal tooth design that points inward.
- Zero Threading Required: You can slide the washer down a plain metal, plastic, or composite axle without cutting any threads.
- Instant, Permanent Lock: As the washer pushes onto the shaft, the inner teeth deflect outward. The moment any back-off force is applied, those sharp teeth bite aggressively into the shaft.
- Vibration Resistant: They exert continuous initial tension, making them highly effective at preventing parts from rattling loose on moving machinery.
- One-Way Assembly: Once secured, they are nearly impossible to slide back off without destroying the fastener.
Common Applications
Because they eliminate the time and cost of machining snap-ring grooves or threading shafts, you will find them everywhere in consumer and industrial assemblies:
- Wheeled Goods: Safely retaining the wheels on the smooth metal axles of prams, pushchairs, toy cars, and hand trucks.
- Automotive & Aerospace: Securing interior panels, insulation covers, and light mechanisms.
- Domestic Hardware: Frequently found on the standard square shafts of garage door handles.
- Manufacturing: Pushing onto precision-machined tubes, cast parts, or plastic studs during fast-moving automated assembly lines.
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