51mm axle with ground centre (X2)

Precision from the axle: the Slot.it spare part that makes a difference in anglewinder setups

The SIPA01-51R axle from Slot.it is a performance part manufactured with the precision that characterises the Italian brand. Ground and hardened, it offers optimal concentricity that directly translates into smooth running and absence of vibrations on track. The reduced centre decreases the rotating mass, a significant detail when seeking tenths in competition.

Technical specifications

• Diameter: 2.38 mm (3/32")
• Length: 51 mm
• Finish: ground and hardened
• Centre: reduced for weight reduction
• Pack contents: 2 units

Function and performance

The grinding ensures that the axle runs perfectly centred within the bearings, eliminating the eccentricity that causes vibration and premature tyre wear. The hardening provides surface hardness without making the steel brittle, allowing the axle to withstand the torque and impacts typical in club sessions without deforming.

The central reduction, in addition to lowering the rotating weight, facilitates the evacuation of lubricant and keeps the contact area with the intermediate bearings clean, which is especially useful in long axles like this 51 mm one.

Recommended applications

With its 51 mm length, this axle is sized for anglewinder setups, where the angled motor position relative to the rear axle often requires longer axles than those used in sidewinder or inline configurations. It is compatible with the extensive range of Slot.it chassis, bearings, and brackets that work with the 3/32" standard.

Assembly and preparation

Before assembly, it is advisable to clean the axle with a lint-free cloth and check that the bearings are free of burrs. When inserting it, ensure that it spins freely: any resistance would indicate a misaligned or dirty bearing. Apply a drop of slot oil to each bearing before securing the crown gear and pinion in their final position.

The central reduction does not affect the torsional rigidity of the axle for typical uses in 1/32 scale, but keep in mind that it should not be subjected to extreme bending forces (for example, setups with widely spaced brackets without intermediate support).

Common mistakes

• Confusing the 3/32" diameter with the 1/8" standard: before ordering, check the diameter of your bearings.
• Mounting the crown gear too tightly and deforming the axle: use the appropriate tool and respect the play recommended by Slot.it.
• Ignoring the length: 51 mm may be excessive for compact chassis designed for sidewinder; review the chassis specifications before installation.

Frequently asked questions

How many units are included in the pack?

The pack contains 2 units of the SIPA01-51R axle.

What is the difference between a ground axle and a standard one?

Grinding is a high-precision machining process that ensures concentricity and surface finish far superior to that of a conventional turned axle. The result is smoother rotation, less vibration, and greater durability of bearings and tyres.

For what type of setup is this axle especially indicated?

It is designed for anglewinder setups, where the motor is positioned at an angle relative to the rear axle. Its length of 51 mm is suitable for chassis that require greater distance between bearings in this type of configuration.

Is it compatible with bearings from other brands?

The diameter of 2.38 mm (3/32") is a widely used standard in 1/32 slot. Any bearing that works with that size should be compatible, although Slot.it recommends using its own bearings to ensure optimal fit.

Do I need special tools to mount it?

To press crown gears and pinions onto the axle without damaging or misaligning it, it is advisable to use a specific axle extractor/press for slot. Slot.it and Sloting Plus offer suitable tools for this purpose.

Slot.it SIPA01-51R — 51 mm rectified and hardened axle with lightened centre, 2.38 mm (3/32") diameter, designed for anglewinder slot car setups in 1/32 scale. Pack of 2 units. Precision-ground steel for smooth rotation, reduced rotational mass and long-lasting performance on club and competition tracks. Compatible with standard 3/32" bearings and the full range of Slot.it chassis components.