Slotted screw DIN 84 M2x20 + lock nuts (4 pcs)

Secure and Repeatable Fixing: Slotted Screw DIN 84 M2x20 with Lock Nut

In the world of slot racing and modelling, the small details make the difference between a build that lasts and one that fails mid-session. The slotted screw DIN 84 M2x20 is a classic reference with a metric size of 2 and a length of 20 mm, featuring a cylindrical head and straight slot, allowing for controlled and comfortable tightening with a precision flat screwdriver. The included lock nuts —with their retention insert— prevent progressive loosening due to vibration, making them the perfect pair for any component subjected to frequent disassembly or the continuous rattling of a track.

This pack contains 4 complete units (screw + lock nut), ready for use in multiple preparation and assembly applications.

Main Features

• Standard: DIN 84 — cylindrical head with straight slot.
• Metric: M2 (2 mm thread diameter).
• Length: 20 mm.
• Lock Nut: with nylon or similar insert that locks the thread and prevents loosening due to vibration.
• Pack Contents: 4 screws + 4 lock nuts.
• Reference: CXM349.

Applications and Compatibility

The M2 metric is one of the most common in slot car preparation, plastic or aluminium chassis, motor mounts, guide supports, and body fixings in static models and figures. The length of 20 mm provides sufficient grip to pass through several stacked elements —such as a chassis with a mount and underlay— without falling short. The lock nut adds the security that the assembly does not move even if the car runs thousands of laps or the model undergoes repeated handling.

They are also useful in the construction of dioramas and modelling structures where pieces need to be joined with the assurance that the joint will not give way over time.

Assembly and Preparation

As these are straight slot screws, tightening is done with a precision flat screwdriver (blade width corresponding to the M2 slot). For optimal tightening, first insert the lock nut into the housing or hold it with fine-tipped pliers, screw in with short and firm movements, and stop when you feel the resistance of the locking insert: it is not necessary to over-tighten, as the lock nut retains the position without the need for high torque.

If you are going to disassemble the assembly frequently, it is advisable to periodically check the condition of the nylon insert of the lock nut, as with many cycles of assembly-disassembly it may lose some of its retaining effectiveness.

Frequently Asked Questions

How many units does this pack include?

The CXM349 pack includes 4 slotted screws DIN 84 M2x20 and 4 lock nuts, that is, 4 complete sets ready to assemble.

What is the difference between a normal nut and a lock nut?

The lock nut incorporates an insert (usually made of nylon) inside it that generates additional friction on the screw thread. This prevents the nut from loosening by itself due to vibration or repeated movement, which is essential in slot cars and modelling assemblies subjected to frequent use.

What tool is used to tighten these screws?

Being straight slot (DIN 84), they are tightened with a precision flat screwdriver with a blade suitable for the M2 size. Avoid using star or Phillips bits, as they do not fit in the slot and may damage the screw head.

Are they suitable for machined aluminium chassis?

Yes, the M2 thread is compatible with M2 threads in both technical plastic and aluminium, provided that the chassis has the hole and thread prepared for this metric. Always check the available depth to ensure that the 20 mm length is suitable for your application.

Can I reuse the lock nuts?

The lock nuts can be reused a limited number of times. With each assembly-disassembly cycle, the retention insert slightly loses its locking capacity. For critical or very frequent applications, we recommend replacing them when you notice they have lost resistance to turning.

The CXM349 pack includes 4 slotted screws DIN 84 M2x20 with nylon-insert lock nuts, ideal for slot car chassis assembly, static model kits, and diorama construction. A reliable M2 fastening solution for hobbyists who demand secure, vibration-resistant fixings in their builds.