Ever tried listing a product on Amazon and hit a roadblock when asked for the manufacturer part number? You’re not alone. This little detail can make or break your product’s visibility and credibility in the marketplace.

Understanding how to find or verify a manufacturer part number is essential for accurate listings and avoiding potential issues with Amazon’s system. In this article, we’ll walk you through practical steps, helpful tips, and insider insights to easily locate the manufacturer part number you need.

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What is a Manufacturer Part Number (MPN) on Amazon?

A Manufacturer Part Number (MPN) is a unique code assigned to a specific product by its manufacturer. Think of it as a product’s fingerprint—no two MPNs are the same for different items or configurations, even from the same company. On Amazon, the MPN serves as a crucial identifier, helping buyers, sellers, and Amazon itself to distinguish between similar products, variations, and brands.

If you sell on Amazon, you may notice fields requesting the MPN when you list a product, especially in categories like electronics, automotive, office supplies, and industrial equipment. This unique identifier improves search accuracy and helps potential buyers quickly confirm they’re viewing (and purchasing) the exact item they want.

Why is the Manufacturer Part Number Important?

Understanding and correctly using the MPN on Amazon has significant advantages for sellers:

• Enhanced Product Searchability: MPNs allow Amazon’s search algorithm to group and display related items more accurately, making it easier for customers to find your products.
• Product Authenticity: Including the MPN on your listing increases buyer confidence. Shoppers can confirm they’re purchasing the genuine product.
• Easier Inventory Management: Sellers with large catalogs use MPNs to keep track of different product versions, accessories, and variations.
• Reduction in Listing Errors: Using MPNs helps sellers prevent duplicate or incorrect product listings, especially for items with similar names or features.

In many cases, Amazon requires an MPN in addition to Global Trade Item Numbers (GTINs) like UPCs, EANs, or ISBNs.

How to Find the Manufacturer Part Number for Amazon

Getting the correct MPN is essential for Amazon sellers but can be confusing. Here’s a step-by-step guide to help you locate, verify, and use the right MPN for your products.

1. Check the Product Packaging

• Physical Packaging: Most manufacturers print the part number on the product packaging—look for a label with words like “Part Number,” “P/N,” or “MPN.”
• Product Itself: Electronics or machine parts often have their MPN engraved or printed directly on the item.
• User Manuals: Instruction booklets will frequently list the MPN with product information or technical specifications.

2. Consult Manufacturer Documentation

• Reach out to the manufacturer or visit their official website.
• Review the technical or product specification sheets, which usually mention the correct MPN.
• Utilize online product catalogs provided by the manufacturer.

3. Use Distributor or Wholesale Invoices

• Authorized distributors and wholesalers include the MPN on their sales invoices, packing slips, or product catalogs.
• If you buy products in bulk, refer to these documents for accurate part numbers.

4. Check Existing Listings

• Search for your product on Amazon using its brand name or model.
• Review existing Amazon listings by reputable sellers or the manufacturer. The MPN is often listed in the product details.
• Cross-reference to ensure the MPN matches your specific model or configuration.

5. Contact the Manufacturer Directly

• If you’re unsure, contact the manufacturer’s customer support for confirmation.
• Provide the product’s model name, physical description, or photos for verification.

6. Check the Supplier or OEM Database

• Many industries—especially automotive and industrial equipment—maintain online databases of manufacturer part numbers.
• Enter your product’s make, model, or description to retrieve the correct MPN.

Best Practices for Using MPN on Amazon

Listing the right MPN on Amazon is more than just copying a number—there are best practices to follow:

• Always Use the Manufacturer-Assigned Number: Never create your own MPN or invent a code. Only use the MPN provided by the product’s original manufacturer.
• Double-Check for Variations: Small differences in color, size, or functionality often mean different MPNs. Don’t mix them up.
• Consistent Branding: Ensure the brand name matches the manufacturer assigning the MPN.
• Complete & Accurate Entry: Enter the entire MPN exactly as shown. Some are case-sensitive or include special characters.
• Avoid Reusing MPNs: Each unique product or variation should have a different MPN. Reusing them can cause catalog conflicts or listing removal.

Common Challenges in Getting the Right MPN

Despite your best efforts, you may encounter hurdles:

• Private Label or Custom Products: If you sell white-label or private label items, the manufacturer may provide a custom MPN for your brand. Always clarify with your supplier.
• Older or Discontinued Items: Products no longer in production can be tricky. Contact the manufacturer or check official archives.
• No MPN Provided: Some generic products may not have a unique MPN. In these cases, Amazon may allow you to leave the field blank or enter “Does not apply.”
• Confusing Numbers: Distinguish between the model number, UPC, and MPN—they are different identifiers for different purposes.

How MPNs Help Boost Your Amazon Sales

Understanding the powerful role of MPNs can give your Amazon business an edge:

• Improved Product Discoverability: When a customer enters an MPN in Amazon’s search bar, your listing can surface more reliably.
• Better Buy Box Chances: Authentic product identification helps you avoid mix-ups and increases your chance of winning the Buy Box.
• Fewer Returns and Claims: Accurate identifiers reduce the risk of customers accidentally purchasing the wrong item.
• Reduced Counterfeiting: MPNs make it harder for counterfeiters to list fake or misleading products under your brand.

How to Add MPN When Listing on Amazon

Here’s how you can include the MPN when creating or editing an Amazon product listing:

1. Start a New Product Listing: Go to your Seller Central dashboard and click “Add a Product.”
2. Enter Basic Product Information: Fill in brand, product name, and other required fields.
3. Find the ‘Manufacturer Part Number’ Field: This is often under ‘Product Details’ or ‘More Details.’ In some categories, it may be labeled as ‘MPN’ or ‘Part Number.’
4. Input the Correct MPN: Copy the manufacturer-provided MPN carefully, including any dashes or special characters.
5. Save and Submit: Verify all data is accurate, then save your listing.

Important Notes:

• Not every product category on Amazon requires an MPN, but providing it whenever possible optimizes your listing’s accuracy and professionalism.
• If you manufacture your own products, assign unique MPNs to each SKU and be consistent across your catalog.

Practical Tips for Amazon Sellers

• Create a Centralized MPN Database: Store all your product MPNs together in a spreadsheet to avoid errors or confusion later.
• Clarify with Suppliers: When sourcing products, always request the official MPN from your supplier or manufacturer.
• Monitor for Listing Errors: Regularly review your listings for correct MPN use, especially when adding new SKUs or updating inventory.
• Use Amazon’s Catalog Tools: Advanced sellers can use the Amazon Inventory Loader or category-specific templates to bulk-edit listings and include accurate MPNs.
• Update MPNs for Discontinued or Updated Products: If the manufacturer issues a new MPN due to an upgrade, reflect this change promptly on your Amazon listings.

Frequently Asked Questions (FAQs)

1. What is the difference between an MPN and a UPC?
The MPN (Manufacturer Part Number) is unique to the manufacturer and identifies a specific product or part. A UPC (Universal Product Code) is a globally recognized barcode used for tracking retail products in stores. MPNs are vital for cataloging and inventory, while UPCs are used mainly at the point of sale.

2. Is it mandatory to enter an MPN when selling on Amazon?
No, Amazon does not require an MPN for every product category. However, many categories strongly recommend or require it, especially in electronics, automotive, industrial, and office supplies. Check the requirements for your specific category in Seller Central.

3. What should I do if my product doesn’t have an MPN?
If your product doesn’t have an official manufacturer-assigned part number (often the case for generic products), you can enter “Does not apply” or leave the field blank if Amazon allows it. Do not invent or reuse MPNs from other products.

4. Can I use my own SKU as the MPN?
No. Your seller SKU is for your own inventory management and is not a substitute for the manufacturer-assigned MPN. Use the genuine MPN from the product’s original manufacturer. For private or white-label products, obtain a unique MPN from your OEM supplier.

5. How can I correct a wrong MPN on my Amazon listing?
If you’ve entered the wrong MPN, log in to Seller Central, edit the affected product listing, and update the MPN in the relevant field. Ensure the new number is accurate and matches the product specs. Double-check other identification fields (brand, model, etc.) for consistency.

In Summary

Manufacturer Part Numbers (MPNs) are essential tools in the Amazon marketplace. They drive better search placement, reduce listing errors, increase buyer confidence, and protect your brand. Always use accurate, manufacturer-supplied MPNs—and don’t be afraid to reach out to suppliers or the manufacturer if you’re unsure.

Whether you’re listing a single item or managing thousands of SKUs, giving proper attention to MPNs can pay dividends in smoother operations and higher sales. Take time to get this detail right—it’s a small step that makes a big difference.