Trailer Axle Label

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If you’ve ever hitched a trailer to your vehicle or observed one on the road, you may have noticed a small, inconspicuous label on the trailer axle. What exactly does this label convey, and why is it essential for both safety and performance? In this guide, we’ll unravel the mysteries behind the trailer axle label.
 

1.What is a Trailer Axle Label?

A trailer axle label is a small sticker or metal plate affixed to the axle of a trailer. The axle label provides critical manufacturing information, including the axle serial number, axle capacity, and axle build information.
Take a picture of your axle label when you first purchase your trailer. This way, you have a clear picture of the label with all the critical axle specifications at your fingertips when needed.

Placement on the Trailer

The axle label is usually situated at the axle tube’s center, positioned beneath your unit’s frame between the tires, brakes, and springs of your trailer’s wheelbase.
            

2.Decoding Labels

Decoding labels, especially trailer axle labels, is an important skill for trailer owners. Decoding axle labels aids in proper maintenance as it guides the user and mechanic in selecting the proper replacement parts and services. In essence, decoding trailer axle tags is the key to unlocking a safer, better maintained trailer experience.

3. Manufacturer Information

“Manufacturer Information” on a trailer axle label is a critical component, providing essential details about the axle’s origin and specifications. Let’s explore the key elements under Manufacturer Information:
             
 

①Manufacturer’s Name and Logo

The manufacturer’s name and logo serve as the primary identification. This information establishes the credibility and origin of the axle. Knowing the manufacturer is crucial for warranty claims, recalls, and ensuring the use of quality components.

②Model or Part Number

The model or part number indicates the specific type or variant of the axle. This information is valuable when seeking replacement parts or when referring to the manufacturer for technical support. It ensures that the correct components are used for maintenance or repairs.

③Cust Po (Customer Purchase Order)

The Customer Purchase Order (Cust Po) is a reference number linked to the customer’s purchase transaction. This helps both the manufacturer and the customer trace and verify the purchase details, streamlining communication and facilitating after-sales services.

④Serial Number

The serial number is a unique identifier assigned to each axle by the manufacturer. This distinct code aids in tracking and differentiating individual units. It is essential for warranty purposes, recalls, and maintenance records.

⑤Mfg. Date (Manufacturing Date)

The manufacturing date specifies when the axle was produced. Knowing the manufacturing date is crucial for assessing the axle’s age, determining its potential wear and tear, and establishing maintenance schedules.

⑥Serial Number Barcode (Digits)

Many modern axle labels feature a barcode corresponding to the serial number. This barcode simplifies data entry and retrieval, making it easier for manufacturers and users to access information quickly and accurately.

⑦Capacity

This indicates the weight capacity of the axle, representing the maximum load it can safely carry.

4.Common Symbols and Abbreviations

Symbols on axle labels serve as shorthand representations, conveying crucial information in a concise manner. Understanding these symbols is vital for decoding the axle’s characteristics and design.

Key Symbols on Axle Labels

①Customer Part Number or Axle Model Number

The first set of numbers usually represents the customer part number or axle model. This alphanumeric code helps identify the specific axle model or part number associated with a customer’s purchase. It simplifies communication and is easy to accurately reference during maintenance or replacement.
               

②Spindle and Brake Designation

This designation provides information about the type and specifications of the spindle and brake system used in the axle assembly. It guides mechanics and users when selecting compatible replacement parts and conducting maintenance.Common Spindle and Brake Designations:
  • SB:Straight spindle, electric drum brake.
  • SBSA:Straight spindle, electric drum brake with self-adjust.
  • SI:Straight spindle, idler hub, no brake

③Number 3(Hub Face and Track Dimension )

The number 3 symbolizes the Hub Face and Track Dimension. It indicates the distance between the faces of the wheel hub and the measurement across the axle’s track. Understanding this dimension is crucial for ensuring proper wheel alignment and compatibility.

④Number 4(Spring Centerr Dimension )

Number 4 represents the Spring Center Dimension. This dimension specifies the distance between the centers of the axle’s leaf spring mounts. It is a critical measurement for proper suspension and alignment, ensuring optimal performance and load distribution.

⑤Tie Plate Designation

This designation provides information about the type and specifications of tie plates used in the axle assembly. Tie plates play a role in connecting various components of the axle and ensuring structural integrity.Abbreviations for common tie plate types and specifications:
  • SPIB:Shock plate mounted for inboard shocks
  • NOSP:No shock plate, regular tie plate is to be used
In addition to this, there are other tie plate models such as SPOB/FIXSS/ADJSS/HUTSS.

⑥Spring Mounting Designation

This symbol indicates the specific method and configuration of mounting leaf springs on the axle. Understanding this designation is crucial for proper suspension setup and alignment.Common leaf spring abbreviations:
  • US:Underslung; springs mounted underneath axle tube。
  • OS:Overslung; springs mounted on top of axle tube
  • NOSS:No spring seat option

                                                      

⑦L(Lubrication Designation )

The letter L signifies the Lubrication Mounting Designation. It provides information about the type and location of lubrication points on the axle. Proper lubrication is essential for reducing friction and extending the lifespan of axle components.

⑧Number 8(Hub Or Drum Designation )

Number 8 represents the Hub or Drum Designation. This designation specifies the type and characteristics of the wheel hub or brake drum used in the axle assembly. It guides users and mechanics when selecting replacement components.

⑨Number 9( Leaf Spring Designation )

Number 9 indicates the Leaf Spring Designation. This symbol provides information about the type and specifications of the leaf springs used in the axle’s suspension system. Proper leaf spring selection is crucial for maintaining the axle’s load-carrying capacity.

⑩Number 10(Wire Leads and Connectors )

Number 10 signifies the Lead Wire Length. This designation indicates the length of electrical lead wires used in components like brakes or sensors. It is essential for proper electrical connections and functionality.

Others

In the image example, you’ll notice 10 to 12 axle description parts. The ABS designation and axle tube part number may not always be included.

Last Number( Axle Beam Assembly Number or Variant Number)

The last number on the axle label represents the Axle Tube Part Number. This identifier corresponds to the axle’s tube, providing specific details about its construction and specifications.

ABS(ABS Equipped ABS)

ABS stands for Anti-lock Braking System. When indicated on the axle label, it signifies that the axle is equipped with ABS. This advanced braking system enhances safety by preventing wheel lockup during braking, especially in slippery conditions.

 

5.Conclusion

Importance of Trailer Axle Labels

In the safety and performance-driven world of trailers, the importance of accurate information cannot be overemphasized. Of course, axle labels vary from one brand manufacturer to another, but all of them put relevant axle specifications, load capacity and other important details on the label. When purchasing again, you need to read them carefully.
Well-designed, informative trailer axle labels act as a beacon, guiding the user to a safer, more efficient towing experience.

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