Hexagonal black aluminium 5mm mounting bush

Precision to the millimetre: the 5mm black aluminium hexagonal locking collar from Scaleauto

When working on the preparation of a slot car at a serious level, every mechanical detail matters. The 5mm hexagonal locking collar from Scaleauto (reference SC-8170D) is one of those parts that makes the difference between a temporary assembly and a truly resolved one. Made from black anodised aluminium, it combines lightness, strength, and a clean finish that the most meticulous preparers appreciate.

Function and performance

Hexagonal locking collars serve a key structural function in the assembly of axles, crown gears, pinions, and other rotating elements of the drivetrain. The hexagonal profile facilitates tightening and loosening with standard tools, reducing the risk of slipping and ensuring a secure and repeatable lock. The H 5mm geometry makes it compatible with common configurations in competition cars and workshop preparations.

The black anodised aluminium is not just an aesthetic choice: anodising hardens the surface of the aluminium, improves its corrosion resistance, and reduces wear from friction at the contact point, extending the lifespan of the part even in a heavy-use environment.

Compatibility and assembly

This part is designed within the ecosystem of spare parts and tools from Scaleauto, a reference brand in the slot racing world. Its most common use is in assemblies on Sport track, although specific compatibility always depends on the chassis and drivetrain configuration of each model. Before assembly, it is advisable to verify that the axle diameter and the recommended torque fit the specifications of the set.

Assembly and preparation

• Clean the axle before installing the collar to ensure contact without play.
• Use the appropriate hex key for the tightening screw to avoid damaging the collar.
• Check the alignment before tightening definitively: a misaligned collar can introduce vibrations into the drivetrain.
• The black anodising is durable, but avoid contact with aggressive solvents that may attack the surface finish.

Ideal for…

This collar fits perfectly into the toolkit of any slot car preparer who wants to keep all spare parts under control. Whether for maintaining a club car in optimal condition or fine-tuning a competition preparation, having quality aluminium collars makes a difference when reaction time in the pits matters.

Frequently asked questions

What exactly is a hexagonal locking collar used for in slot racing?

It is used to secure drivetrain elements —such as crown gears or pinions— onto the axle, preventing them from moving laterally during operation. The hexagonal profile of the tightening screw allows it to be immobilised precisely without damaging the axle.

Why choose anodised aluminium over steel for this type of part?

Anodised aluminium offers a significantly lower weight than steel, which is advantageous in competition cars where every gram counts. Anodising also provides surface hardness and corrosion resistance, making it a balanced solution between performance and durability.

Is it compatible with any 3mm axle?

The H 5mm measurement refers to the geometry of the collar, not directly to the inner diameter of the axle. Check the specifications of your chassis and the Scaleauto catalogue to confirm exact compatibility before assembly.

Can I reuse the collar after disassembling it?

Generally yes, as long as the aluminium shows no deformations and the anodising is not damaged in the contact area. If the collar has suffered excessive tightening or shows signs of wear, it is advisable to replace it to ensure reliable locking.

The Scaleauto SC-8170D is a 5mm hexagonal aluminium locking collar, black anodised, designed for slot car axle and transmission assembly. A lightweight, precision part essential for competitive slot car preparation, compatible with Sport track systems and used by experienced builders seeking reliable, repeatable fixing solutions.