M2 self-locking nut for 4mm wrench

Small detail, big difference: the M2 lock nut that never fails at the crucial moment

In precision mechanics —and slot racing and modelling are part of it— a loosening fastener is a problem that arises at the worst time. The M2 lock nut (ref. SP151312) made of stainless steel is designed to maintain tension even under vibration, repeated assembly and disassembly cycles, or demanding workshop conditions.

Main features

• Thread: M2
• Wrench: 4 mm
• Material: Stainless steel
• Function: Locking — resists loosening due to vibration or tension
• Contents: Bag with 20 units

Why locking?

Unlike a standard nut, the locking nut incorporates a system —usually a nylon insert or a deformed profile on the thread— that generates additional resistance to reverse rotation. This is especially valuable in applications where the component is exposed to continuous vibrations or where access to check the tightness is difficult. In slot car chassis, motor mounts, axle supports, or any critical point in a modelling assembly, this type of nut provides an extra layer of security without adding complexity.

Recommended installation and use

The M2 diameter is one of the most common in the world of slot racing and scale models. The 4 mm wrench opening allows for the use of common tube or flat wrenches found in any preparation workshop. For proper tightening, avoid exceeding the recommended torque for M2 threads in stainless steel: the goal is to lock, not deform.

Coming in a bag of 20 units, you will have enough spares for several simultaneous projects or to replenish workshop stocks without relying on urgent orders.

Frequently asked questions

How many nuts are included in the package?

Each bag contains 20 units of M2 lock nuts.

Is it compatible with standard M2 screws?

Yes. The M2 thread is a metric standard, so it is compatible with any standard pitch M2 screw (0.4 mm).

Why stainless steel and not carbon steel?

Stainless steel offers greater corrosion resistance, which prolongs the lifespan of the component and prevents oxidation from compromising the tightness over time. It is especially recommended in environments with some humidity or in components that are not frequently checked.

Can I reuse these locking nuts?

Nylon insert locking nuts can be reused a limited number of times; after several cycles, the locking capability may decrease. For critical applications, it is good practice to replace them if they have been tightened and loosened repeatedly.

What specific applications are they useful for in slot racing or modelling?

They are ideal for securing motor mounts, axle supports, guides, bodies with screw anchoring, or any point on the chassis where long-term tightness security is needed.

Stainless steel M2 nylon insert lock nut for 4 mm wrench, supplied in a bag of 20 units. Essential hardware for slot car chassis building, static model assembly and precision hobby mechanics. Corrosion-resistant and reusable, compatible with all standard M2 screws.