Flat nut DIN 439 M2 (10pcs)

The DIN 439 M2 flat nut: small in size, essential in the preparation workshop

In the world of slot and competition modelling, the smallest details often determine whether a car runs accurately or has unwanted play. The DIN 439 M2 flat nut is one of those elements that every serious preparer always has on hand: its reduced profile allows for very fine adjustments in spaces where a conventional nut would not fit or would add too much height.

Features and function

The DIN 439 standard defines low-profile hex nuts, also known as flat nuts or thin nuts. Their height is significantly less than that of a standard DIN 934 nut, making them the usual choice when it is necessary to:

• Locking nut to secure axles, adjustment screws, or parts with limited clearance.
• Adjust lateral play in motor mounts and axle supports.
• Mounts on chassis where the screw travel is limited.
• Stabilise adjustable elements without adding unnecessary height to the assembly.

The metric thread M2 is the most commonly used in 1/32 scale slot applications and precision modelling work, where small diameter screws and axles are the norm.

Pack of 10 units

This 10-unit pack is designed for the regular preparer who does not want to run out of stock in the middle of a job. Having several spare parts is especially useful when working with locking nuts, as it is common to lose them during disassembly or need to replace them after several adjustment cycles.

Applications in the hobby

DIN 439 M2 flat nuts frequently appear in:

• Slot preparation: securing and locking nut on rear axles, sidewinder, inline or anglewinder motors, and guide supports.
• Static models and dioramas: precision metal assemblies where a low-profile fastening element is required.
• Electronics and auxiliary mounts: securing connectors, plates, and supports in circuit installations.

Compatibility and mounting

As a standardised part under the DIN 439 standard, it is compatible with any M2 metric thread screw or axle, regardless of the manufacturer. Always check that the screw or axle you are mounting the nut on is indeed metric M2 and that the thread is not damaged, to ensure a correct and secure tightening.

Common mistakes

• Confusing M2 with other thread pitches: although visually similar, an M2 nut will not thread correctly onto an M1.7 or M2.5 axle. Always check the metric before forcing the tightening.
• Over-tightening: being a low-profile nut, the torque should be moderate. Excessive tightening can deform the nut or damage the screw thread.
• Using as a main nut without a locking nut: its low-profile design is optimised for the function of a locking nut or in applications with limited space, not as a sole fastening element under intense vibration.

Frequently asked questions

What is the difference between a DIN 439 nut and a DIN 934 nut?

The DIN 934 is the standard hex nut, with an approximate height of 1.6 mm in M2. The DIN 439 has a lower profile (approximately 1.2 mm in M2), making it ideal for tight spaces or for use as a locking nut without adding too much height to the assembly.

For which slot axles or screws is the M2 useful?

The M2 thread is very common in motor mounting screws, injected plastic chassis parts or carbon fibre, and in some guide adjustment systems. It is one of the most recurring sizes in fine tuning of 1/32 scale slot cars.

Can I use these nuts as a locking nut to secure an adjustment?

Yes, that is precisely one of their most common uses. They thread onto another nut or against a surface to immobilise the adjustment achieved, preventing the vibrations from the motor or circuit from altering it over time.

What tool is used to tighten them?

For a DIN 439 M2 nut, a 4 mm spanner or fixed wrench (M2 nut wrench) is needed. Fine-nose pliers can also be used with care, although the proper wrench ensures even tightening without damaging the faces of the hexagon.

Does the pack include any type of lock or washer?

No, the pack contains exclusively the 10 DIN 439 M2 flat nuts. If you need additional washers or locks, please consult them as separate items in the catalogue.

The CXM380 pack contains 10 DIN 439 M2 flat nuts, an essential low-profile fastener for slot car preparation, static model assembly and precision hobby work. Compatible with any standard M2 metric thread, these thin hex nuts are widely used as locking nuts on motor mounts, axle supports and chassis components in 1/32 scale slot cars. A must-have consumable for any serious slot car builder or modeller working with small-diameter metric hardware.