3/32 plastic spacers in different sizes

The fine adjustment that makes a difference in every assembly

In the preparation of a slot car, the smallest details are often the ones that most influence the final result. The 3/32 plastic spacers SC-1121 are one of those elements that go unnoticed until you need them… and when you need them, nothing else will do. Their function is simple yet critical: to precisely position pinions, crown gears, bearings, and other components along the rear axle, preventing unwanted lateral play and ensuring that each piece works exactly where it should.

Function and performance

A poorly chosen spacer —too thick, too thin, or made of unsuitable material— can cause rubbing, vibration, or misalignment in the transmission, resulting in loss of speed and increased wear on the parts. These plastic spacers provide a clean and smooth fit without adding unnecessary weight to the assembly. The plastic, correctly formulated for this use, does not deform the axle or leave marks, unlike some low-quality metal spacers.

Compatibility and measurements

They are designed for axles with a diameter of 3/32" (approx. 2.38 mm), the most widespread standard measurement in competitive slot racing and preparation. Available in different thickness measurements, they allow for any spacing situation that may arise during assembly, whether in a Sidewinder, Inline, or Anglewinder configuration. They are compatible with nearly all chassis on the market that use this axle diameter, including those from brands like NSR, Slot.it, Scaleauto, and Avant Slot, among others.

Assembly and preparation

The assembly process is straightforward: with the axle removed from the chassis, the spacers are threaded in the desired order along with the pinion, bearings, and other elements. Before permanently securing the transmission, it is advisable to check that there is no lateral play or excessive pressure on any component. Manually rotating the axle before the first power-up is always a good practice to detect any rubbing points.

• Material: precision plastic
• Inner diameter: 3/32" (approx. 2.38 mm)
• Available in different thickness measurements
• Use: positioning of pinions, crown gears, bearings, and rear axle elements
• Reference: SC-1121

Common mistakes

The most common mistake is not paying attention to the total spacing of the axle and assembling the spacers without verifying the final alignment of the crown gear with the pinion. A minimal misalignment multiplies wear and reduces the efficiency of the transmission. Another common mistake is mixing spacers of different materials and tolerances without checking that the resulting dimensions are correct. With these clearly defined plastic spacers, that risk is considerably minimized.

Frequently asked questions

What type of axle are these spacers for?

They are specifically designed for axles with a diameter of 3/32" (approximately 2.38 mm), the most common standard measurement in slot cars for preparation and competition.

Are they compatible with steel and tungsten axles?

Yes, being made of plastic, they do not damage the surface of the axle, making them perfectly compatible with both conventional steel axles and harder tungsten axles.

How many different thickness measurements does the SC-1121 assortment include?

The product is available in different thickness measurements, although the exact measurements of each unit are not specified in the provided information. We recommend checking the details on the datasheet or contacting us to confirm the available sizes at any given time.

Can they be used in Sidewinder, Inline, and Anglewinder assemblies?

Yes. The function of the spacer is independent of the type of motorization. They serve to correctly position the elements of the rear axle in any transmission configuration.

Does the plastic withstand the heat generated by the motor during the race?

The spacers are away from the motor and are not in direct contact with the main heat sources of the car. Under normal track use conditions, the heat generated at the axle does not compromise the integrity of the plastic.

SC-1121 plastic spacers for 3/32" axles are an essential tuning component for slot car builders and racers looking to achieve perfect gear and bearing alignment. Compatible with NSR, Slot.it, Scaleauto, Avant Slot and most competition chassis using the standard 3/32" axle diameter. Available in multiple thicknesses to cover any setup requirement. Find them at Ministry of Hobby, your specialist in slot car preparation, scale models and high-end collecting.