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300# 73mm Tinplate Bottom End: Standard‑Size Can Base Lid for Food‑Grade Metal Cans

2026-09-03

The 300# 73mm tinplate bottom end is one of the most widely‑used standard can base lids for three‑piece round metal cans in global food packaging production. Designed for high‑speed can‑making lines, this 73‑mm bottom cover delivers stable double‑seam performance, excellent corrosion resistance and long‑term hermetic protection for canned goods, dry powder and pet food products.

Manufactured from premium electrolytic tinplate (ETP) or tin‑free steel (TFS), the 300# bottom end features strict dimensional consistency with professional industrial standards. It adopts a nominal can diameter of 73mm, with an outer curl diameter of 83±0.15mm, a countersink depth of 4.1±0.10mm and a curl height of 1.9±0.08mm. The conventional material thickness ranges from 0.18mm to 0.24mm, which fully meets the production requirements of standard food cans, and we can customize the thickness according to customers’ actual production and packaging needs.

Both internal and external lacquer systems of the product strictly comply with international food‑contact safety standards. The BPA‑NI inner coatings including aluminized, golden and white enamel can effectively resist acid, salt and sulphide corrosion, perfectly adapting to the packaging of fruits, meat, seafood and wet pet food. The outer surface supports multiple finishing processes such as clear lacquer, golden varnish and custom offset printing to help customers realize brand display and product differentiation. Every batch of products will undergo strict online visual inspection and coating continuity testing to eliminate pinholes, poor sealing and other quality defects, ensuring stable and consistent product quality.

Core Advantages of 300# 73mm Tinplate Bottom Lid

1. Perfect Compatibility for Standard Production Lines

As a mainstream industry‑standard 300# specification product, the 73mm bottom end is highly compatible with mainstream three‑piece can bodies in the market. It does not require any modification and debugging of existing double‑seaming equipment, which can effectively help can manufacturers improve mass production efficiency, reduce equipment adjustment costs and production waste, and realize stable and efficient continuous production.

2. Reliable Hermetic & Physical Performance

Adopting precision integral forming technology, the product’s curl profile is smooth and standardized, which can form a tight double‑seam structure with the can body to achieve excellent airtight and waterproof effects. The product has strong mechanical strength, which can effectively resist deformation and damage during high‑temperature sterilization, product stacking, long‑distance ocean transportation and daily warehousing. It can isolate external oxygen and moisture stably, greatly extending the shelf life of packaged products.

3. Broad Application Coverage

This 300# 73mm tinplate bottom cover has strong versatility and covers multiple packaging fields. It is suitable for retort sterilized canned food including fruits, vegetables, tomato paste, meat and seafood. It also applies to various dry food packaging such as nut powder, spice powder and coffee powder. In addition, it is widely used in wet pet food cans, pet treat metal containers and general‑purpose round metal cans for non‑food industrial materials, meeting diverse packaging needs of different industries.

4. Flexible Factory Customization & Bulk Supply

We provide flexible personalized customization services for this product. Customers can freely choose ETP tinplate or TFS tin‑free steel raw materials, and match different internal and external lacquer combinations according to product usage scenarios. We also support custom outer‑surface printing with exclusive brand patterns and logos. The factory has large monthly production capacity, which can stably undertake large‑volume wholesale and bulk orders. Adopting waterproof sleeves plus export pallet packaging, it can effectively protect the bottom covers from dust, deformation and damage during long‑distance export transportation. Meanwhile, we provide free sample testing services for customers to conduct seaming tests on their equipment before formal ordering.

Frequently Asked Questions

Q: Can 300# 73mm bottom ends work for retort‑sterilized canned food?

A: Yes. Equipped with professional heat‑resistant food‑grade inner lacquer, these bottom ends can stably withstand the high‑temperature and high‑pressure retort sterilization process, which is fully applicable to the production of sterilized canned meat, fruits and vegetables. Customers only need to inform us of the specific filling medium and sterilization parameters, and we will match the most suitable coating scheme for you.

Q: What is the minimum order quantity?

A: The MOQ is determined according to customer demand and processing technology. The plain non‑printed bottom ends support flexible large‑volume bulk orders; custom printed products have a corresponding minimum order quantity due to plate making and process costs. You can contact our sales team to obtain detailed MOQ, quotation and delivery cycle information.

Q: Are samples provided for double‑seam testing?

A: Yes. We can provide free official product samples. Customers can use the samples to complete equipment seaming adaptation tests and quality verification before mass procurement, so as to avoid production risks caused by mismatched accessories.

If you are sourcing qualified 300# 73mm tinplate bottom ends for your can‑making plant or packaging project, get in touch with our factory for detailed quotation, coating suggestion and delivery arrangement.

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