8d Pinion M50 Brass for 1.5mm Motor Shaft. d 5.5mm

Precision Transmission: the Scaleauto Brass Pinion for 1.5 mm Motor Axle

When working on a slot car's transmission, every millimetre counts. The SC-1295A55 pinion from Scaleauto is a small component but has a significant impact on the car's final performance: made of brass, with 8 teeth, module 50 and an outer diameter of 5.5 mm, it is designed to be mounted directly on motor axles with a diameter of 1.5 mm.

Main Features

• Number of teeth: 8
• Module: 50 (M50)
• Material: Brass
• Motor axle diameter: 1.5 mm
• Outer diameter: 5.5 mm
• Reference: SC-1295A55
• Brand: Scaleauto

Function and Performance

The pinion is the first link in the transmission chain: it receives the rotation from the motor shaft and transmits it to the crown gear. A well-dimensioned pinion made from a material like brass ensures smooth engagement, with low noise levels and controlled wear over time.

Brass is a classic and proven material in slot preparation due to its balance between mechanical strength, machinability, and wear resistance. Unlike plastic pinions, brass maintains tooth geometry under load and temperature, resulting in a more consistent and reliable transmission.

With only 8 teeth and module 50, this pinion is geared towards high transmission ratios, useful when prioritising acceleration and torque on track over top speed. Combined with crowns of a higher tooth count, it allows for fine-tuning the transmission ratio to the characteristics of the circuit and the motor used.

Compatibility and Installation

This pinion is designed for motor axles with a 1.5 mm diameter, a common size in 1/32 and 1/24 scale motors frequently used in slot preparation and competition. Before purchasing, it is advisable to verify the exact diameter of your motor's axle, as a small difference can affect fit and performance.

The module 50 (M50) must match the module of the crown gear it pairs with. Mixing different modules results in incorrect gearing that causes noise, accelerated wear, and loss of efficiency in the transmission. Always check the specifications of your crown gear before selecting the pinion.

Installation and Preparation

For correct installation, it is advisable to check the play between the pinion and crown gear once installed: there should be a small clearance to avoid binding, but not so much that it generates vibration or noise. A small fixing point (adhesive for axles or a securing nut, depending on the motor system) ensures that the pinion does not move axially during operation.

If the motor axle shows any play or wear, it may be necessary to check its condition before installing the new pinion, as a damaged axle limits the improvement offered by the new part.

Frequently Asked Questions

Which crown gears is this pinion compatible with?

It should be paired with crown gears of module 50 (M50). The number of teeth on the crown will determine the final transmission ratio. It is not compatible with crown gears of different modules (e.g., M48 or M55).

What scale is this pinion intended for?

Although Scaleauto does not specify an exclusive scale, the dimensions (1.5 mm axle, 5.5 mm diameter) are common in 1/32 and 1/24 scale setups. Always verify the dimensions of your motor-chassis assembly before installation.

Why choose brass over plastic?

Brass offers greater mechanical strength, less deformation under load, and more progressive and predictable wear than plastic. For competitive use or demanding preparations, brass is the usual choice among builders.

How do I know if the pinion is properly installed?

Once installed, the pinion should rotate without noticeable axial play, and the engagement with the crown gear should be smooth, without hard spots or excessive noise. Check the tooth play: a small clearance is correct; if there is binding or too much play, check the positioning.

Is it a consumable or does it last long?

It depends on usage. In regular competition, brass pinions wear over time, especially if the alignment with the crown gear is not perfect. It is advisable to inspect them periodically and have spare units in the preparation case.

The Scaleauto SC-1295A55 is an 8-tooth brass pinion gear, module 50, designed for 1.5 mm motor axles with an outer diameter of 5.5 mm. A precision slot car transmission part ideal for 1/32 and 1/24 scale builds, suitable for club racing and competitive slot car preparation requiring reliable and consistent gear meshing.