M2 locking washer

Small but decisive: the M2 lock washer that won't let you down on track

In the world of competitive slot racing, every screw matters. A fastening that loosens under vibration can ruin a tuning session or, worse, alter the car's behaviour during a race. The M2 lock washer (ref. SP150091) from Sloting Plus is designed precisely to prevent that: its star profile exerts constant pressure on the screw head, resisting the progressive loosening caused by motor vibration and continuous movement on the track.

Features and specifications

• Material: stainless steel — corrosion-resistant and suitable for prolonged use
• Metric: M2 x 4
• Type: star (lock washer with teeth)
• Contents: bag of 20 units
• Reference: SP150091

Function and performance

The characteristic teeth of star washers slightly bite into the contact surface — whether it be the chassis, the mount, or any metal component — creating mechanical resistance to the reverse rotation of the screw. The result is a joint that remains stable even under the continuous vibrations of a slot motor spinning at thousands of revolutions.

The stainless steel ensures that these washers do not rust or lose their properties over time, which is especially relevant if you work with lubricants or if the car undergoes periods of storage.

Compatibility and installation

Designed for M2 screws, the most common standard in the fasteners of 1/32 scale slot cars. They can be used at any fastening point where M2 screws are employed: securing motors, mounts, guides, bodies, axles, or any chassis element that requires a secure and stable connection.

Installation does not require special tools: simply place the washer between the screw head and the surface before tightening. However, it is recommended not to reuse lock washers that have already been tightened multiple times, as the teeth may progressively lose some of their effectiveness.

Common mistakes

• Omitting them for time-saving: the difference between assembling with or without a lock washer is noticeable after just a few intensive running sessions.
• Reusing them excessively: the teeth wear out. With 20 units per bag, there is room to renew them without issue.
• Confusing them with flat washers: the function is different. The flat washer distributes load; the star lock washer secures and locks the screw.

Frequently asked questions

What metric are these washers for?

They are for M2 screws, the most common size in the preparation of 1/32 scale slot cars.

How many units does the bag contain?

Each bag contains 20 units.

Why stainless steel and not carbon steel?

Stainless steel better resists corrosion in the presence of lubricants and moisture, and maintains its mechanical properties for longer, making it ideal for small components that should not be replaced too frequently.

Can they be reused?

It is possible to reuse them a limited number of times, but the star teeth lose effectiveness with each tightening and loosening cycle. For competitive or critical assemblies, it is most advisable to use new units.

Are they compatible with any slot chassis?

Yes, as long as the screw is M2. It is the standard metric in the vast majority of 1/32 scale slot chassis and components.

The Sloting Plus SP150091 M2 stainless steel star lock washer is an essential hardware component for slot car preparation and tuning. Designed for M2 screws, these 20-unit packs provide reliable vibration-resistant fastening for motors, guide holders, axle mounts, and chassis assemblies. A must-have accessory for any serious 1/32 slot car builder or club racer looking for lasting, secure fittings.