Differences Between Model, SKU, Part Number, and Serial Number on Construction Equipment – Differences Between SKU, Part Number, and Serial Number Models It is important to understand this before requesting a quote for equipment, searching for replacement parts, reviewing tender documents, or verifying the information on a nameplate. All four terms can consist of a combination of letters and numbers, but their functions and the parties that define them are not always the same.
Errors in reading codes can result in incorrect model information, incompatible spare parts, inconsistent quotation data, or mixed-up unit histories. For example, the number used by the warehouse as an SKU is not necessarily the manufacturer’s part number. The serial number that identifies a single physical unit should also not be used as a substitute for the model.
Before determining the product code, the team should ensure that Technical Specifications for Equipment for a Tender has been broken down into function, capacity, field conditions, power source, and mandatory parameters. The product identifier is then used to ensure that the technical documents being reviewed actually refer to the specific model, variation, or unit in question.
In This Article
Why Should Product Identities Be Distinct?
Product identifiers have several levels of use. A code can identify:
- product family or type;
- items in the inventory system;
- certain components;
- one physical unit;
- production group;
- drive motor;
- frame or chassis;
- a specific variation.
GS1 distinguishes between the identity of a product class and the identity of a single product instance. In the GS1 system, a GTIN can identify a trade item, while a combination of a GTIN and a serial number can identify a single physical unit of that trade item. This demonstrates that the identity of a product class and the identity of a physical unit are two distinct levels.
In the construction equipment industry, manufacturers, distributors, retailers, ERP systems, and equipment owners may also use different code formats. Therefore, the codes must be interpreted in conjunction with one another:
- the label's name;
- location where the code was found;
- original document;
- manufacturer's name;
- model;
- revision;
- serial range;
- the context in which it is used.
Do not infer the meaning of a code based solely on its length, the sequence of numbers, or its similarity to other codes.
What Is a Model?
A model is the designation of a product type, family, or configuration provided by the manufacturer.
Model functions
The model helps distinguish products based on characteristics such as:
- capacity;
- size;
- generation;
- power source;
- configuration;
- function;
- features;
- application area.
A single model can be produced in many physical units. Therefore, a model is not usually unique to a single unit.
As a generic example, all units of the model ABC-100 They may share the same basic design, but each unit has a different serial number.
The model isn't always enough to find spare parts
In some cases, parts catalogs classify components based on:
- serial range;
- year or production batch;
- revision;
- configuration;
- engine;
- attachment;
- marketing territory.
The official Caterpillar parts website, for example, asks for the model or serial number to filter components and states that the serial number helps display the relevant parts diagrams for a specific machine. This shows that the model alone is not always sufficient to ensure a part’s compatibility.
What Is an SKU?
SKU stands for stock-keeping unit. SKUs are generally used as internal codes to manage inventory within a company’s system.
SKU Function
SKUs can help:
- inventory tracking;
- product grouping;
- warehouse management;
- online store integration;
- item search;
- sales reporting;
- variation management;
- Cross-branch product mapping.
SKUs may vary from company to company
The same product can have different SKUs in:
- manufacturer;
- distributor;
- supplier;
- store;
- the WooCommerce system;
- ERP system;
- branch;
- warehouse.
Therefore, an Agung Rejeki SKU or a supplier SKU is not automatically the manufacturer’s official code.
An SKU should also not be automatically considered as:
- model;
- part number;
- serial number;
- material number;
- GTIN.
If an SKU is used in a quotation or purchase request, clearly indicate its source, for example:
Supplier's internal SKU:
SKU-ABC-01
Do not list it as a part number if the source label does not specify it as such.
What Is a Part Number?
A part number is a code used to identify a specific component, assembly, kit, accessory, or item within a manufacturer’s or supplier’s system.
Part Number Function
Part numbers can be used for:
- looking for spare parts;
- check the parts catalog;
- prepare a quotation;
- distinguish between revisions;
- identify the assembly;
- manage supersession;
- check the package;
- Determine compatibility based on the documentation.
Part numbers are subject to change
A single component function can have more than one part number because:
- design changes;
- revision;
- supersession;
- region;
- supplier;
- package;
- material changes;
- unit configuration;
- serial range.
If an old part has been replaced, the manufacturer’s documentation may list the new part number as a replacement. However, supersession should not be assumed without a parts catalog or official confirmation.
Physical appearance is not proof of the part number
Two components may look similar but differ in:
- dimensions;
- material;
- connector;
- direction of rotation;
- mounting;
- tolerance;
- rating;
- revision.
Therefore, when searching for parts, it’s best to use a combination of:
- unit model;
- serial number;
- part position;
- parts catalog;
- old part number;
- photo;
- size;
- function;
- revision.
What Is a Serial Number?
A serial number is a code that identifies a single unit.
GS1 explains that a serial number can be numeric or alphanumeric and is assigned to a single instance of an entity. In trade item identification, the combination of the basic product identifier and the serial number makes it possible to distinguish one unit from another of the same type.
The Function of the Serial Number
The serial number may be helpful:
- distinguish between physical units;
- check the service history;
- check the serial range;
- searching for parts diagrams;
- check the factory settings;
- linking unit documents;
- check the warranty, if applicable;
- asset tracking.
A serial number is not a part number
The serial number does not identify the type of component to be purchased. The serial number identifies the unit in which the component is used.
Therefore, the more appropriate format for the inquiry is:
Model number:
ABC-100
Serial number:SN000123
Part being searched for: a component in a specific location
Old part number: available or not found
Not:
Part number:
SN000123
unless the official documentation explicitly refers to that code as a part number.
Differences Between SKU, Part Number, and Serial Number Models
| Identity | Main functions | Created by | Unique per unit | Examples of usage | Risk of misreading |
|---|---|---|---|---|---|
| Model | Identifying the product type or configuration | Manufacturer | Generally not | Searching for a datasheet or catalog | The specifications were taken from the wrong model |
| SKU | Managing items in the internal system | Companies, suppliers, stores, warehouses | Not always | Inventory, invoices, WooCommerce, ERP | Considered a manufacturer code |
| Part number | Identifying specific components or items | Manufacturer or supplier | Generally not unique per unit | Parts catalog and spare parts quote | Wrong component or revision |
| Serial number | Identifying a single physical unit | Manufacturers or entities responsible for serialization | Yes, within the scope of the system | Unit history, serial number range, parts search | Considered a part number |
| Batch/lot number | Identifying production groups | Manufacturer | No | Batch Tracking | Considered a unit series |
| Material number | Identifying materials in a specific system | System owners, such as ERP | Not always | Inventory and Material Master | Considered equivalent to the part number |
SAP explains that a material number uniquely identifies a material within the SAP system. This is an example of how a material code can have a specific meaning within a system and is not necessarily the same as the terminology used by other manufacturers.
Other Codes Commonly Found on the Device
Machine number
The machine number can be used to identify a machine, but its meaning varies by manufacturer.
For some brands, the machine number may function like a serial number. For other brands, the code may refer to the configuration, production number, or internal identifier.
The appropriate status if there is no documentation yet:
PENDING — the meaning of the code needs to be confirmed.
Material number
A material number can serve as an item code in an ERP system or a manufacturer’s system. SAP, for example, uses material numbers to identify materials in its system.
Don’t automatically refer to the material number as the part number without checking:
- column title;
- source document;
- publishing system;
- item description;
- regarding the parts catalog.
Product number
A product number can identify a product or item, but its definition depends on the manufacturer.
Check whether the product number refers to:
- product type;
- package;
- configuration;
- commercial item;
- catalog code;
- variation.
Type
Label TYPE can mean:
- model;
- technical type;
- machine category;
- configuration;
- a specific designation.
Do not replace the label TYPE become MODEL in a baseless quote.
Engine number
The engine number identifies the engine and may differ from the main unit's serial number.
A single device may contain:
- unit serial number;
- engine model;
- engine serial number;
- serial number generator;
- frame number.
Everything must be labeled.
Frame or chassis number
This code may refer to the frame or chassis. Do not confuse it with the engine serial number or the main unit serial number.
Batch or lot number
A batch or lot number identifies a production batch, not an individual unit. The GS1 architecture also distinguishes between batch or lot identities and the identities of individual product instances.
Variation
A variation is a specific configuration of a parent product.
Variations may differ in the following ways:
- SKU;
- part number;
- price;
- capacity;
- size;
- weight;
- image;
- accessories;
- power source;
- condition;
- service eligibility.
Parent data should not be automatically inherited by all variations unless there is a source stating that the data applies universally.
GS1 also states that different product variants should have different product identities in the context of GTINs. This principle reinforces the importance of not mixing data across variants.
How to Properly Verify a Product's Authenticity
1. Identify the object being examined
Determine whether the need relates to:
- complete unit;
- engine;
- components;
- spare part;
- attachment;
- accessories.
2. Take a photo of the entire unit
The full-body photo helps identify:
- type of equipment;
- configuration;
- component positions;
- attachment;
- unit form.
Photos do not confirm specifications, but they help provide context.
3. Take a photo of the nameplate
Photos must:
- straight;
- sharp;
- not affected by reflections;
- pretty close;
- display all plates;
- not cut off;
- displays the label for each code.
4. Copy the code exactly as it appears in the source
Keep:
- uppercase and lowercase letters, if applicable;
- hyphen;
- slash;
- space;
- prefix;
- suffix;
- number of characters.
Do not guess at unreadable characters.
5. Write down the label next to the code
Example:
| Visible data | Label on the source | Interpretation | Status | Additional evidence |
|---|---|---|---|---|
ABC-123 | MODEL | Product models | VERIFIED | Data Sheet |
00012345 | SERIAL NO. | Unit serial number | VERIFIED | Nameplate |
XYZ-01 | No label | Cannot be determined yet | PENDING | Official Catalog |
MAT-001 | MATERIAL NO. | Material number in the publisher's system | CONDITIONAL | Dokumen sistem |
ENG-009 | ENGINE NO. | Nomor engine | VERIFIED | Engine plate |
Semua kode di atas merupakan contoh fiktif.
6. Check official sources
Gunakan:
- datasheet;
- catalog;
- manual;
- parts catalog;
- service manual;
- parts diagram;
- konfirmasi produsen atau vendor.
7. Check the serial range and revision
Satu part number mungkin hanya berlaku untuk serial range tertentu.
Situs resmi Cat Parts juga menggunakan serial number untuk menampilkan diagram dan part yang lebih relevan terhadap mesin yang dipilih.
8. Record data that is still uncertain
Gunakan status:
- VERIFIED;
- CONDITIONAL;
- CONFLICT;
- PENDING;
- NOT IDENTIFIED;
- NOT APPLICABLE.
Jangan memaksakan identifikasi hanya agar inquiry terlihat lengkap.
Examples of Misidentification
- Serial number dianggap part number
Akibatnya pencarian tidak menemukan komponen atau menghasilkan item yang salah. - SKU toko dianggap kode produsen
Supplier lain tidak mengenali kode tersebut. - Model unit digunakan sebagai kode spare part
Satu model dapat memiliki banyak komponen. - Mencari part hanya dari foto
Bentuk serupa tidak menjamin dimensi dan fungsi sama. - Suffix model dihilangkan
Suffix dapat menandai kapasitas, region, revision, atau konfigurasi. - Serial range tidak diperiksa
Part dapat berubah pada produksi berikutnya. - Kode unit dan engine dicampur
Engine mempunyai identitas sendiri. - Invoice dianggap selalu memakai part number produsen
Invoice mungkin memakai SKU supplier. - Data diambil dari model yang mirip
Kemiripan nama bukan bukti kesesuaian. - Nama file gambar dijadikan identitas
Nama file dapat dibuat manual dan tidak membuktikan isi. - Angka nol dibaca sebagai huruf O
Kesalahan satu karakter dapat mengubah hasil pencarian. - Angka satu dibaca sebagai huruf I
Foto lebih tajam atau dokumen pendukung diperlukan. - Tanda hubung dihilangkan
Format asli harus dipertahankan. - Data parent digunakan untuk semua variation
Setiap child variation perlu diperiksa terpisah. - Pernyataan “bisa dipakai” dianggap verifikasi
Kompatibilitas harus didukung sumber produk.
Information to Provide When Requesting a Quote
Identitas produk perlu dikirim bersama kebutuhan teknis. Gunakan RFQ Checklist for Construction Equipment untuk melengkapi fungsi, aplikasi, jumlah, kondisi, lokasi, jadwal, serta dokumen pendukung.
| Information | Wajib atau disarankan | Reason |
|---|---|---|
| Brand | Highly recommended | Mempersempit sumber pencarian |
| Model | Highly recommended | Mengidentifikasi tipe unit |
| Serial number | Highly recommended | Memeriksa unit dan serial range |
| Kode pada nameplate | Wajib bila tersedia | Mencegah salah salin |
| Label setiap kode | Required | Menentukan arti kode |
| Foto nameplate | Highly recommended | Menjadi bukti visual |
| Foto unit lengkap | Highly recommended | Memberi konteks konfigurasi |
| Fungsi part | Wajib untuk spare part | Memahami kebutuhan |
| Posisi part | Highly recommended | Membantu pencarian diagram |
| Part number lama | Highly recommended | Membantu cross-check |
| Ukuran | Disarankan | Memeriksa kandidat |
| Total | Required | Menyusun quotation |
| Conditions | Required | Memisahkan baru, bekas, atau kebutuhan lain |
| Application | Highly recommended | Memastikan fungsi |
| Location | To be confirmed | Mendukung logistik |
| Manual atau katalog | Disarankan | Menambah bukti |
| Drawing | Disarankan | Membantu verifikasi |
| Tender Requirements | Wajib bila terkait tender | Memastikan compliance |
| PIC teknis | Required | Memudahkan klarifikasi |
Untuk kebutuhan pengadaan, informasi tersebut juga perlu diselaraskan dengan Checklist of Construction Equipment Bid Documents, terutama jika model, aksesori, dokumen pendukung, dan identitas produk akan digunakan dalam penawaran teknis.
Product Identification Checklist
CHECKLIST IDENTIFIKASI PRODUK DAN SPARE PART
Jenis kebutuhan: unit / spare part / attachment / aksesori
Brand:
Model:
Type:
SKU:
Part number:
Serial number:
Machine number:
Material number:
Product number:
Engine number:
Frame/chassis number:
Kode lain:
Label yang tertulis di samping kode:
Foto unit lengkap:
Foto nameplate:
Foto part:
Posisi part pada unit:
Fungsi part:
Jumlah:
Ukuran:
Kondisi:
Aplikasi:
Nomor manual atau katalog:
Halaman katalog:
Serial range:
Revision:
Superseded part number:
Lokasi penggunaan:
Target kebutuhan:
PIC teknis:
Catatan:FAQ
What is the difference between a model number and a serial number?
The model identifies the product type or configuration. The serial number distinguishes one physical unit from another of the same model.
What is the difference between an SKU and a part number?
An SKU is typically an internal inventory management code. A part number identifies a component or item according to the manufacturer’s or supplier’s system.
Is an SKU the same as a product code?
An SKU may be a product code within a specific internal system, but it is not automatically a model, GTIN, or manufacturer part number.
Can the serial number be used to find replacement parts?
Yes, the serial number can help determine the serial range and the unit's configuration. However, the serial number is not the spare part code itself.
Is the model sufficient for determining spare parts?
Not necessarily. Some parts depend on the model year, revision, engine, or configuration.
Where are part numbers usually found?
Part numbers can be found in parts catalogs, component labels, official packaging, specific invoices, drawings, or manufacturer documentation.
Are all the codes on the nameplate part numbers?
No. A nameplate may include the model, serial number, type, machine number, engine data, rating, or other codes.
What is the function of a suffix in a model?
Suffixes may indicate configuration, capacity, region, generation, or features. The exact meaning should be checked in the manufacturer’s documentation.
What if the text on the nameplate is illegible?
Take new photos from several angles, clean the surface carefully, check the unit’s documentation, and don’t guess at the characters.
Why are photos of the complete unit still required?
The overall photo helps you understand the unit type, configuration, attachments, and component positions.
Can an invoice be used as a source for a part number?
This can serve as a supporting document, but the invoice may use the supplier’s internal SKU. Check the column labels and verify them against the manufacturer’s documents.
What should you do if the datasheet and nameplate show different information?
Record both values, the source, model, version, and physical unit. Set the status to CONFLICT and request confirmation from the manufacturer or vendor.
Conclusion
Memahami Differences Between SKU, Part Number, and Serial Number Models membantu mengurangi kesalahan identifikasi unit dan spare part.
Model menjelaskan tipe produk. SKU membantu pengelolaan item dalam sistem internal. Part number digunakan untuk mengidentifikasi komponen atau item tertentu. Serial number membedakan satu unit fisik dari unit lainnya.
Jangan membaca kode tanpa label dan konteks. Gunakan foto unit, nameplate, datasheet, parts catalog, manual, serial range, serta dokumen pendukung. Apabila arti kode belum dapat dipastikan, gunakan status PENDING dan jangan menyatakan kompatibilitas.
Belum yakin kode mana yang merupakan model, SKU, part number, atau serial number? Kirimkan foto unit, nameplate, kode yang terlihat, fungsi komponen, dan dokumen pendukung melalui Consultation on Construction Equipment Needs agar identitasnya dapat diperiksa sebelum permintaan penawaran diproses.
Identifikasi, kecocokan, harga, stok, dan ketersediaan tetap perlu dikonfirmasi berdasarkan sumber produk yang relevan.
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