At Monroc, each axle is identified by a reference code that provides essential technical information. Understanding this code allows you to quickly choose the right model for your needs. Here’s how to decode a typical reference, for example: 354F.
35: The Square Dimension
The first number 35, refers to the square section of the axle shaft, expressed in millimeters. In this example, 35 means the axle shaft has a 35 mm square profile.
This measurement directly affects the load capacity and mechanical strength of the axle:
- A larger square section supports heavier loads and is suitable for intensive use.
- A smaller square section is ideal for lighter applications or low-tonnage vehicles.
The square size should be chosen based on the load to be transported, the type of trailer, and the usage conditions (fields, roads, slopes, etc.).
4: The Number of Studs
The next digit in the reference, here 4, indicates the number of studs that secure the wheel to the axle hub.
To fully identify the mounting system, you must also consider the stud diameter, the thread pitch and the pitch circle diameter (PCD) — the diameter of the circle going through all studs.
At Monroc, we offer the following combinations:
- 4 studs: 14 mm studs with 1.5 mm thread pitch, PCD from 85 to 130 mm
- 5 studs: 16 × 1.5 mm, PCD from 94 to 140 mm
- 6 studs: 18 × 1.5 mm, PCD from 160 to 205 mm
- 8 studs: 18 × 1.5 mm, PCD from 220 to 275 mm
- 10 studs: 22 × 1.5 mm, PCD from 280 to 335 mm
It’s crucial to check that both the number of studs and the PCD match your wheels to ensure proper fit and safety.
F : The material or type of hub
The final letter F at the end of the reference code may indicate the material of the hub used on the axle:
- F = cast iron
- A = steel
- Other letters may indicate specific variants depending on the model.
The final letter, F, identifies the type of hub mounted on the axle. The hub is the mechanical component that connects the axle to the wheel.
At Monroc, we offer various hub types, each aligned with industry-standard bolt patterns, diameters, and bearing types.
Other letters may indicate specific variants depending on the models.
For example, for Monoblock straight brake axles, the letters MF, MFR, or MFD identify particular configurations, as do XF or XFR for other braked axles.
Choosing the correct hub ensures perfect wheel compatibility and a smooth, safe rotation.
In Summary
The reference 354F gives you:
- 35 mm square section → axle shaft size, directly related to load capacity
- 4 studs → 14 mm studs with a PCD between 85 and 130 mm
- F → cast iron hub (material)
This clear and practical coding system helps you save time, avoid mistakes, and order the most suitable axle for your application.
Not sure which reference you need? Need a custom axle or expert advice?
Get in touch with our Monroc team — we’re here to help you make the right choice.
