7d pinion M50 steel for 2mm axle ø5.0mm x 2mm

Scaleauto SC-1127B50 Steel Pinion: Precise Transmission for 2 mm Axle

The SC-1127B50 is a 7-tooth, module 50 (M50) pinion gear made of steel by Scaleauto. It is specifically designed for 2 mm diameter axles and has an outer diameter of 5.0 mm, with a width of 2 mm. A small but crucial transmission component when fine-tuning the gear ratio of a slot car.

Function and Performance

The pinion is the gear that is mounted directly on the motor shaft and transmits the rotation to the crown gear. With 7 teeth and module 50, this pinion falls within the tighter range of gear ratios: ideal for increasing torque on circuits with many curves or in configurations where traction is prioritised over top speed.

The manufacturing in steel ensures greater durability compared to standard plastic pinions, better resisting wear during long sessions and the fatigue associated with continuous engagement at high revolutions.

Compatibility and Installation

This pinion is designed for 2 mm diameter axles, the most common size in inline, sidewinder, and anglewinder motors of scale 1/32. It is essential to verify that the module of the pinion (M50) matches that of the crown gear you will be using: mixing different modules leads to poor engagement, excessive noise, and premature wear of both parts.

Installation is done with the usual fit on the motor shaft; it is advisable to check the axial play and alignment with the crown gear before permanently securing the position.

Common Mistakes

• Mixing Modules: using an M48 crown with this M50 pinion (or vice versa) results in incorrect engagement. Always check that the pinion and crown share the same module.
• Forcing Installation: if the pinion does not fit smoothly onto the shaft, do not force it. A slight adjustment of the grinder or the shaft usually resolves the issue without damaging the part.
• Neglecting Alignment: a misaligned pinion relative to the crown produces vibrations and shortens the lifespan of both gears.

Ideal for…

This 7-tooth pinion fits well in setups aimed at technical circuits, with many curves and few long straights, where a short gear ratio helps to exit corners better. It is also useful as a starting point in tuning a new car, allowing for adjustments in tooth count based on the layout.

Frequently Asked Questions

What crown module should I use with this pinion?

As it is module 50 (M50), you must pair it with a crown gear that is also module 50. Mixing different modules prevents correct engagement and damages both parts.

Is it compatible with any 2 mm axle motor?

Yes, as long as the motor has a 2 mm diameter output shaft. This is the most common size in 1/32 scale slot motors, although it is advisable to verify before ordering.

What advantage does steel offer over plastic in a pinion?

Steel withstands wear from friction and impact loads in engagement better, especially during long sessions or in cars with higher power motors. The lifespan is significantly greater.

How does the number of teeth affect the car's behaviour?

With fewer teeth on the pinion (like these 7), the gear ratio is mechanically longer: the motor has to turn more times to move the crown. This translates to more torque and acceleration, but less top speed. Increasing the pinion teeth achieves higher top speed at the cost of some traction.

Can I use it on SPORT track and UNIVERSAL track?

The type of track does not directly affect the pinion. What matters is compatibility with the motor axle and the car's crown gear. This pinion works on any track system as long as the motor-transmission group is appropriate.

The Scaleauto SC-1127B50 is a 7-tooth, module 50 steel pinion gear for 2 mm motor axles, with a 5.0 mm outer diameter and 2 mm width. A key transmission part for 1/32 slot car tuning, compatible with M50 crown gears and widely used in inline, sidewinder and anglewinder motor configurations. Ideal for technical circuits where short gear ratios and strong acceleration are required.