Special Suspension Screw Set with Tapered Head ø4.5mm. M2.2x5mm in Brass.

Millimetre precision for your slot suspension: special Scaleauto SC-5139A screws in brass

In the preparation of a slot car, the details that matter most are often the smallest. These Scaleauto conical head suspension screws are specifically designed for suspension systems in scale racing cars, where the adjustment of dimensions is crucial for load distribution, ground clearance, and cornering response.

Technical specifications

• Reference: SC-5139A
• Brand: Scaleauto
• Material: Brass
• Metric: M2.2
• Head diameter: ø4.5mm (conical)
• Shank diameter: ø1.80mm
• Thread length: 3.5mm
• Shank length: 1.5mm
• Total length: 5mm
• Contents: 6 units per pack

Function and performance

Brass is the material chosen by experienced preparers when seeking dimensional stability and corrosion resistance in small parts subjected to constant vibration. Unlike stainless steel, brass allows for controlled tightening without the risk of seizing in fine threads such as M2.2, which is particularly relevant in high-density plastic chassis or machined suspension mounts.

The conical head facilitates a perfect fit in the housings designed for this profile, eliminating lateral play that can occur with cylindrical heads in suspension applications. The result is a more stable and repeatable geometry, both on the workbench and on the track.

Compatibility and assembly

These screws are designed for Scaleauto kits and chassis that incorporate front or rear suspension systems. Check the technical sheet of your chassis or kit to confirm that it uses M2.2 metric before placing your order. The M2.2 thread is not standard across all manufacturers, so this spare part is specifically aimed at the Scaleauto preparation ecosystem.

For assembly, we recommend using a precision screwdriver with a tip suitable for the type of head and applying a firm but not excessive tightening, respecting the torque that the M2.2 brass thread can withstand.

Common mistakes

• Confusing M2.2 with M2 or M2.5: these are different metrics. An M2 screw does not thread correctly in an M2.2 housing and vice versa.
• Over-tightening: brass is softer than steel; excessive tightening can deform the thread or the housing.
• Using in applications not designed for conical heads: if your chassis housing does not have a conical chamfer, opt for cylindrical or flat head screws.

Frequently asked questions

Why brass and not steel for these screws?

Brass offers a combination of corrosion resistance, machinability, and anti-friction behaviour that makes it very suitable for fine threads in precision parts. Additionally, its lower hardness compared to steel reduces the risk of damaging the housing in materials such as engineering plastic or zamak.

Which Scaleauto chassis or kits are compatible?

They are designed for the suspension systems of the Scaleauto brand itself. We recommend checking the reference of the screws indicated in the manual or technical sheet of your specific kit to confirm compatibility before assembly.

Does the pack include nuts or just the screws?

The SC-5139A pack contains only the 6 screws. Nuts and other suspension components are purchased separately from the Scaleauto special screws catalogue.

Can I use these screws in cars from other brands?

As long as the destination housing has an M2.2 thread and the design accommodates a conical head of ø4.5mm, it is technically possible. However, the M2.2 metric is uncommon outside the Scaleauto catalogue, so they are likely to be incompatible with systems from other manufacturers.

How many units do I need for a complete suspension?

It depends on the specific design of the chassis. Check the parts list or manual of your Scaleauto suspension kit to know how many screws of this reference the assembly requires. The 6-unit pack is designed to cover a complete installation plus some spare units.

Scaleauto SC-5139A special conical head suspension screws in brass — M2.2x5mm, ø4.5mm head, 6-unit pack. Precision slot car hardware engineered for Scaleauto suspension systems, offering reliable thread engagement and dimensional stability for competitive slot racing preparation and chassis tuning.