Cylindrical Tungsten Counterweight 6.3x1mm 0.58g

Pure tungsten at the service of balance: the Slot.it SISP24 ballast weight

In the preparation of a slot car, grams matter — and tenths of a gram even more. The cylindrical Slot.it SISP24 ballast weight measures 6.3x1 mm and weighs 0.58 g, a high-density tungsten piece designed to fine-tune weight distribution with a precision that other materials simply do not allow.

Function and performance

Tungsten is one of the densest metals available to the slot car preparer. Its high density — nearly double that of steel — allows for more mass to be concentrated in less volume. This is crucial when working on chassis where free space is limited and every millimetre counts. With the SISP24, weight can be added at specific points on the chassis to correct the centre of gravity, balance the load between axles, or compensate for the weight of the motor and transmission.

• Material: high-density tungsten
• Shape: cylindrical
• Dimensions: 6.3 x 1 mm
• Unit weight: 0.58 g
• Slot.it reference: SISP24

Recommended applications

This type of ballast weight is commonly used in competition chassis where regulations limit total weight or ballast position. Being cylindrical and of small diameter, it fits into tight spaces and can be stacked or combined with other pieces to achieve the exact weight needed for tuning. It is especially useful for:

• Adjusting load distribution between the front and rear axles.
• Compensating for lateral weight differences in sidewinder or anglewinder motor setups.
• Reaching the minimum regulatory weight in club categories without adding mass in unfavourable positions.
• Lowering the centre of gravity by placing ballast in the lowest areas of the chassis.

Installation and preparation

Its cylindrical geometry facilitates fitting into holes made with a standard drill bit. It is recommended to secure the ballast weight with a drop of cyanoacrylate glue or low-viscosity epoxy resin to prevent movement during the race. Before finalising the installation, it is advisable to conduct weight tests on a precision scale to verify that the obtained distribution is as desired.

Ideal for…

Preparers and club racers working with Slot.it chassis or any other plastic or aluminium chassis in 1/32 scale where precise ballast adjustment is required. It is also practical for those competing in categories with regulated minimum weight and needing to add grams in a controlled and repeatable manner.

Frequently asked questions

Why use tungsten instead of lead or steel for ballast weights?

Tungsten has a much higher density than lead and nearly double that of steel. This allows for the same mass to be added while occupying a significantly smaller volume, providing more freedom to choose the ballast position on the chassis without compromising space for other components.

How many units are included in the SISP24 package?

The information provided by Slot.it does not specify the exact number of units per blister for this specific reference. We recommend checking the product listing in-store or contacting us before placing an order if you need a specific quantity.

Is it compatible with chassis from other brands?

As a generic ballast piece in cylindrical format, it can be used in any chassis that has a suitable housing for its dimensions (6.3 x 1 mm), regardless of the brand. Its use is not limited to Slot.it chassis.

How do I calculate how many ballast weights I need?

Weigh the assembled car on a precision scale and compare it with the target weight or the minimum regulatory weight. The difference, divided by 0.58 g, indicates the approximate number of SISP24 pieces needed. Remember to allow for adhesive and small variations between units.

Can they be placed anywhere on the chassis?

Technically yes, as long as there is physical space and the attachment is secure. However, the position does influence the car's behaviour: placing the ballast low and centred improves stability, while moving it forward or backward alters the load distribution between axles and the handling in corners.

The Slot.it SISP24 is a cylindrical tungsten ballast weight measuring 6.3x1 mm and weighing 0.58 g, designed for precise weight distribution tuning in 1/32 scale slot cars. Thanks to tungsten's exceptional density, it allows adding mass in tight spaces where steel or lead weights would not fit. A must-have tuning accessory for club racers and competitive slot car builders seeking accurate chassis setup and balance.