item number; part number; stock number
Used in business, manufacturing, and retail contexts to refer to a unique identifier for a product or component.
この部品の品番を教えてください。
Please tell me the part number for this component.
Please check the part's item number before ordering.
品番で検索すると、すぐに見つかります。
If you search by item number, you'll find it right away.
You can search by item number on this website.
The item number in stock didn't match the order form.
商品番号 is a slightly more formal, retail-oriented synonym for 品番, both referring to a product's identifying number.
Compound of 品 (hin, 'item, goods') and 番 (ban, 'number').