The first piece of information encountered when ordering, technically evaluating or servicing a telescopic cylinder is often an apparently complex code sequence: 43175555503. Although this sequence may initially look like a standard part number, it is actually a technical summary containing the cylinder’s complete engineering identity, dimensions and capacity.

Reading this code structure correctly is critical to maintaining control over procurement, achieving the correct system match in field applications and making accurate engineering assessments. A significant proportion of installation or performance mismatches encountered in the field can result from incomplete or incorrect interpretation of the code blocks.

General Framework of the Code Structure

The HMLIFT telescopic-cylinder coding system is built on five fundamental blocks:

[Series Code][Diameter] — [Number of Stages] — [Stroke] — [Connection Type]

Let us divide the example code 43175555503 into its component blocks according to this structure:

Technical Details and Meanings of the Blocks

1. Series Code (First Two Digits)

The beginning of the code identifies the product family to which the cylinder belongs. 42 denotes the Classic series (GREY), 43 the Gold series (GOLD), and 45 the Diamond series (BLACK). This code does not merely distinguish colour; it is a parameter defining the material standard, surface-coating technology and pressure capacity of the system—for example, the Diamond series’ hard-chrome capability at 250 bar.

2. First-Stage Diameter

The second block gives, in millimetres, the outside diameter of the first moving stage, which directly affects the cylinder’s lifting force. Diameters in the HMLIFT production range vary from 116 mm to 245 mm according to the tonnage required by the application. Under basic hydraulic principles, increasing the diameter at the same system pressure increases piston area and therefore the theoretical lifting force. Diameter selection must consequently be analysed in balance with body volume and the target load profile.

3. Number of Stages

This digit indicates the number of stages inside the cylinder body. HMLIFT designs are available with three to seven stages. The number of stages determines the ratio between the cylinder’s closed (retracted) length and its extended length. Increasing the number of stages makes it possible to achieve a longer stroke with a more compact closed length; however, this must be verified geometrically against the vehicle chassis and body installation dimensions.

4. Stroke (Travel Distance)

The fourth block expresses, in millimetres, the net operating distance travelled by the cylinder from the fully closed position to the fully extended position. HMLIFT stroke lengths range from 2,470 mm to 8,675 mm. Stroke selection depends directly on body length, the target tipping angle and the geometric location at which the cylinder is connected to the body. Optimising stroke for the body geometry is an important criterion for safe and balanced unloading.

5. Connection Type (Final Digit)

The final digit of the code defines how the cylinder is mechanically integrated with the chassis and body. HMLIFT has six connection types:

Each connection type changes the way forces are distributed to the chassis and body during installation. The code must match the vehicle-superstructure design exactly.

Conclusion and Order Verification

A telescopic-cylinder code is not an ordinary string of numbers but an engineering language. Before ordering and production, reviewing the cylinder code together with the bracket, pump, valve and tank configurations as a complete system reduces the risk of field incompatibilities. HMLIFT technical documentation and engineering support should be used to clarify the technical parameters.