Tinplate lids, also widely known as tin can ends or metal can ends, are an essential part of metal packaging systems used for food, beverages, powdered products, pet food, edible oil and many other packaged goods. Although a can end may appear to be a relatively simple component, its material grade, hardness, internal coating, opening structure, diameter and seaming compatibility all have a direct influence on packaging performance.
For food manufacturers, can producers and packaging distributors, selecting the correct tinplate lid requires more than choosing a diameter. The properties of the packed product, sterilization conditions, can body dimensions, opening method and corrosion resistance requirements should all be considered before mass production.
In this guide, GDD Metal introduces the major types of tinplate lids, coating options, tinplate material specifications, common industry size codes and application recommendations to help buyers select suitable can ends for different packaging projects.
1. What Is a Tinplate Lid?
A tinplate lid is a metal end manufactured mainly from electrolytic tinplate and designed to close and seal a metal can. Depending on the packaging system, the lid may be used as the top end, bottom end or easy-open end of the container.
Tinplate combines the mechanical strength of steel with the protective characteristics of a tin coating. When the appropriate internal coating and sealing structure are selected, tinplate ends can be used for a wide range of food and industrial packaging applications.
Common tinplate lid applications include:
- Canned vegetables and fruits
- Tomato paste and sauces
- Tuna, sardines and other seafood
- Luncheon meat and other canned meat
- Pet food
- Milk powder and nutritional powder
- Coffee and other dry foods
- Edible oil
- Beverage cans
- Large foodservice cans
2. Main Types of Tinplate Lids and Can Ends
Different packed products require different opening systems. Factors such as sterilization method, consumer convenience, package size and product characteristics should be considered when selecting a lid.
| Lid Type | Main Characteristics | Typical Applications |
|---|---|---|
| Standard End | Conventional metal end designed for mechanical can opening and reliable double seaming. | 3-piece food cans, retorted products and general food packaging. |
| EOE / Easy Open End | Integrated pull-ring system allows consumers to open the can without a separate can opener. | Fish, vegetables, fruits, pet food and other canned foods. |
| Full Aperture EOE | Provides a large opening area for easier removal of solid or semi-solid contents. | Luncheon meat, ready meals and larger solid food products. |
| Peel-Off Foil End | Uses a peelable membrane or foil opening system for convenient access. | Milk powder, nutrition powder, coffee and dry food cans. |
| Beverage End | Pull-tab opening system designed for beverage containers. | Carbonated drinks, juice and energy drinks. |
| Custom Printed Lid | The top surface can be customized with printed graphics for product identification and branding. | Branded food cans, promotional packaging and customized metal containers. |
3. Standard Tinplate Ends vs. Easy Open Ends
Standard ends and easy open ends are two of the most commonly used metal can closures, but their opening structures are significantly different.
A standard end normally requires a can opener after the lid has been double-seamed onto the can body. This structure is widely used for food cans where a simple and robust closure is required.
An easy open end (EOE) incorporates a scored opening panel and pull ring. The consumer pulls the ring to fracture the score line and open the package. This structure provides greater convenience and is widely used for canned fish, fruit, vegetables, meat and pet food.
For products such as luncheon meat or ready-to-eat solid foods, a full aperture easy open end can provide a wider opening, allowing the packed product to be removed more easily.
4. Why Internal Coating Is Important for Food Can Lids
For food-grade metal packaging, the metal surface and the packed product should be appropriately separated according to the characteristics of the contents. An internal coating acts as a protective barrier between the tinplate substrate and the product.
The coating system should be selected according to factors such as acidity, sulfur content, protein content, sterilization conditions and required storage performance.
Golden Lacquer
Golden lacquer is generally based on an epoxy-phenolic or organosol coating system and has a characteristic golden or amber appearance. It offers acid and sulfur resistance and is commonly used for fruit and meat can applications.
For highly acidic products such as tomato-based products, the coating system should be selected according to the actual filling medium and processing conditions.
Aluminum Paste Coating
Aluminum paste coatings contain aluminum powder particles and normally provide a silver-gray metallic appearance. They offer strong resistance to sulfide staining and are especially suitable for protein-rich foods.
Typical applications include:
- Fish cans
- Luncheon meat cans
- Pet food cans
- Other protein-rich food packaging
Clear Lacquer
Clear lacquer provides basic corrosion protection while retaining the natural metallic appearance of the tinplate surface. It is commonly considered for dry foods, candies and other products with relatively low corrosion requirements.
5. Tinplate Steel Substrate Selection
Tinplate performance is determined not only by the tin coating but also by the properties of the underlying steel substrate. Different substrate types are suitable for different forming and corrosion-resistance requirements.
| Steel Type | Characteristics | Typical Uses |
|---|---|---|
| MR Steel | General-purpose substrate for standard metal packaging. | Ordinary food cans, stationery boxes and general metal containers. |
| L Steel – Low Residual Steel | Provides improved corrosion resistance for demanding contents. | Acidic foods, tomato products, fruits and sardine cans. |
| D Steel – Deep Drawing Steel | Excellent ductility and forming performance. | Complex-shaped cans, drawn components and irregular metal packaging. |
6. Tinplate Hardness Grades
Temper or hardness grade influences the forming behavior and mechanical strength of the tinplate. Selecting the correct grade is particularly important for stamping, drawing and lid manufacturing.
| Temper Grade | Characteristics | Typical Applications |
|---|---|---|
| T1 – Extra Soft | Excellent deep-drawing performance. | Deep-drawn components, spray cans and battery cases. |
| T2 – Soft | Suitable for general deep drawing. | Milk powder cans and beverage-related packaging. |
| T3 – Medium | General-purpose temper grade. | Food cans, chemical cans and general metal packaging. |
| T4 – Hard | Suitable for shallow drawing and applications requiring greater rigidity. | Bottle caps, trays and selected can-end applications. |
| T5 – Extra Hard | High rigidity; generally not intended for demanding drawing operations. | Trays, gaskets and structural metal components. |
7. Tin Coating Weight Selection
The amount of tin deposited on the steel surface is another important specification. Tin coating weight should be selected according to the packed product, internal lacquer system and required corrosion resistance.
| Designation | Tin Coating Weight (g/m²) | Typical Application |
|---|---|---|
| E1.1/1.1 | 1.1 / 1.1 | Applications with relatively low tin-coating requirements and appropriate internal protection. |
| E2.0/2.0 | 2.0 / 2.0 | General food cans including dry and low-acid foods. |
| E2.8/2.8 | 2.8 / 2.8 | Common specification for standard food cans such as fruits and vegetables. |
| E5.6/5.6 | 5.6 / 5.6 | Applications requiring increased corrosion resistance. |
| E8.4/8.4 | 8.4 / 8.4 | High-acid or strongly corrosive packaging environments where the specification is appropriate. |
The final tin coating specification should be confirmed according to the packed contents, lacquer system, sterilization method and required shelf-life performance.
8. Understanding Tin Can Size Codes: What Do #300, #603 and 300 × 407 Mean?
One of the most common sources of confusion when purchasing tinplate lids is the traditional can-size coding system.
For example:
300 × 407
- 300 indicates the nominal can diameter code.
- 407 indicates the can height code.
In this coding system, the first digit represents whole inches and the final two digits represent sixteenths of an inch. For example:
#603 = 6 + 3/16 inches.
However, buyers should not assume that the industry code is identical to every physical dimension of the finished can or lid. The can body’s nominal outer diameter, the end diameter and the seaming profile are separate dimensional references.
For example, a #300 can body may have a nominal outer diameter of approximately 76.2 mm, while the corresponding lid fitting or inner-profile reference may be approximately 72.9–73 mm.
9. Common Round Tinplate Lid Sizes
The following table provides reference information for commonly used round tinplate can-end specifications.
| Industry Size | Reference Lid Diameter | Typical Can Size | Reference Capacity | Common Uses |
|---|---|---|---|---|
| #200 | 49.5 mm | 52 × 70 / 52 × 80 mm | 100–130 ml | Tomato paste, seafood, sample cans |
| #202 | 52.3 mm | 52 × 80 / 52 × 100 mm | 140–200 ml | Condensed milk, paste, coffee |
| #211 | 65.3 mm | 65 × 80 / 65 × 99 mm | 250–350 ml | Tuna, beans, pet food |
| #300 | 72.9 mm | 76 × 111 / 76 × 120 mm | 300–450 ml | Luncheon meat, vegetables, fruit |
| #307 | 83.3 mm | 83 × 113 / 83 × 125 mm | 450–650 ml | Tomatoes, soup, fruit cocktail |
| #401 | 98.9 mm | 99 × 119 / 99 × 133 mm | 700–1000 ml | Fruit, tomato paste, powdered food |
| #502 | 126.5 mm | 127 × 178 mm | 1800–2500 ml | Bulk fruit, sauces, catering food |
| #603 | 153.4 mm | 153 × 178 / 153 × 200 mm | 2500–3800 ml | Edible oil, large fruit cans and catering products |
| #700 | 176.3 mm | 176 × 198 mm | 4000–5000 ml | Industrial food and bulk ingredients |
Important: The diameters and capacities above are reference values. Final dimensions must be confirmed according to the actual can body, lid profile, product density, filling level and seaming requirements.
10. Common Can Size and Application Matrix
In addition to lid diameter, buyers often specify a complete can size such as 300 × 407 or 603 × 700. The following reference matrix shows several common industry combinations.
| Industry Size | Reference Dimensions | Reference Capacity | Typical Uses |
|---|---|---|---|
| 202 × 306 | Approx. 54.0 × 85.7 mm | 80–200 ml | Tomato paste, food concentrates, sauces and single-serving fruit. |
| 211 × 400 | Approx. 68.3 × 101.6 mm | 296 ml / 10 oz | Evaporated milk, condensed milk, coffee, beans, sauces and dry powders. |
| 300 × 407 | Approx. 76.2 × 112.7 mm | 414 ml / 14 oz | Soups, beans, fruits and vegetables, meat products and ready-to-eat meals. |
| 307 × 409 | Approx. 87.3 × 115.9 mm | 562 ml / 19 oz | Tomato products, vegetables, fish, pet food and canned meat. |
| 401 × 411 | Approx. 103.2 × 119.1 mm | 828 ml / 28 oz | Bulk-pack fruits, vegetables, pet food and ready-made meals. |
| 404 × 700 | Approx. 108.0 × 177.8 mm | 1.42 L / 48 oz | Foodservice products, fruits, vegetables, tomato products, oils and fats. |
| 502 × 510 | Approx. 130.2 × 139.7 mm | 1.6–1.8 L | Milk powder, coffee, nuts, biscuits, cereals and bulk dry goods. |
| 603 × 700 | Approx. 157.2 × 177.8 mm | 2.96 L / 100 oz | Cooking oil, foodservice fruits and vegetables, sauces and bulk food products. |
Actual net capacity is affected by product density, headspace, can profile, filling conditions and sterilization process. Therefore, nominal capacity values should be treated as reference information rather than final production specifications.
11. Example: #603 Tinplate Lid Specification
The #603 size is widely used for large food cans and foodservice packaging. One reference specification is shown below.
| Parameter | Reference Specification |
|---|---|
| Nominal Can Diameter | 157.2 mm |
| Lid Diameter | 153–153.4 mm |
| Reference Unit Weight | 0.0505 kg/pc |
#603 Pallet Packing Reference
| Pallet Configuration | Quantity per Pallet | Reference Net Weight |
|---|---|---|
| 6 Layers | 14,400 pcs | 729 kg |
| 7 Layers | 16,800 pcs | 849.5 kg |
#603 Reference 20FT Container Loading
- Reference pallet quantity: 24 pallets
- Example configuration: 12 six-layer pallets + 12 seven-layer pallets
- Reference net weight: approximately 20 metric tons
- Reference quantity: approximately 374,400 pieces
Packing configurations and container quantities should be reconfirmed according to the final lid specification, pallet dimensions, packaging method and shipping requirements before shipment.
12. Food-Contact Testing and Quality Control
For food packaging projects, material safety and coating performance should be verified according to the destination market and the intended food-contact application.
According to an SGS test report for a tinplate sample supplied by Henan GDD Metal Materials Co., Ltd., the tested sample received passing results for the specified test items including:
- US 21 CFR 109.6 – Leachable Lead
- US FDA 21 CFR 175.300 – Total Extractives
Testing requirements may vary depending on the destination country, coating system, packed product and end use. Buyers should therefore confirm the required standards and compliance documentation before ordering materials for a specific food-contact application.
13. Why Seaming Compatibility Is Critical
A tinplate lid cannot be selected only according to a nominal diameter. The lid curl, countersink, seaming panel, can body flange and sealing compound must work together during the double-seaming process.
Even two products described using the same nominal industry size may require dimensional verification before production.
For this reason, the safest purchasing procedure is to provide:
- Can size code
- Actual can body diameter
- Can body drawing
- Required lid type
- Existing lid sample if available
- Seaming machine information
- Packed product
- Sterilization process
- Required internal coating
For a new project, sample matching and an actual seaming test are strongly recommended before mass production.
14. How to Select the Right Tinplate Lid
When sourcing tinplate lids or easy open ends, buyers should evaluate the complete packaging system rather than focusing on only one specification.
A practical selection process should consider the following factors:
- Identify the packed product – such as tomato paste, fruit, fish, meat, pet food, milk powder or edible oil.
- Determine the opening method – standard end, EOE, full aperture EOE or peel-off end.
- Confirm the can size code – such as #202, #211, #300, #307, #401, #502 or #603.
- Confirm the actual can dimensions – nominal codes alone are not sufficient for final tooling confirmation.
- Select the appropriate internal coating according to the chemical properties of the contents.
- Confirm the tinplate substrate and temper grade required for forming and mechanical performance.
- Check sterilization requirements for retorted or thermally processed foods.
- Perform sample and seaming tests before starting high-volume production.
15. Custom Tinplate Lid Solutions from GDD Metal
GDD Metal supplies tinplate materials and metal packaging solutions for customers serving food, beverage, dry powder and industrial packaging markets.
Available tinplate lid solutions can include different:
- Industry size codes
- Lid diameters
- Standard ends
- Easy open ends
- Full aperture ends
- Peel-off ends
- Internal coating systems
- Tin coating weights
- Steel substrate and temper grades
- Printed lid designs
Because lid compatibility depends on the complete can and seaming system, customers are encouraged to provide technical drawings, can samples or existing lid samples whenever possible.
Frequently Asked Questions About Tinplate Lids
What is an EOE tinplate lid?
EOE stands for Easy Open End. It is a metal can end incorporating a pull ring and scored opening panel, allowing the consumer to open the package without using a separate can opener.
What is the difference between an EOE and a standard can end?
A standard can end normally requires a can opener, while an EOE incorporates a pull-tab opening system. Both can be designed for double seaming onto compatible metal can bodies.
What does #300 mean on a tin can?
#300 is a traditional industry size designation associated with the nominal diameter of the can. It should not be interpreted as the exact physical diameter of the finished lid. The actual lid and seaming dimensions must be confirmed separately.
What does 300 × 407 mean?
In the traditional can-size system, 300 indicates the nominal diameter code and 407 indicates the can height code. A 300 × 407 can has a reference size of approximately 76.2 × 112.7 mm and a reference capacity of approximately 414 ml / 14 oz.
What products commonly use #603 cans?
#603 cans are commonly associated with larger foodservice packages, including edible oil, large fruit cans, sauces and other bulk food products.
Which internal coating should be used for food cans?
The coating should be selected according to the chemical characteristics of the packed food. Golden lacquer, aluminum paste coatings and clear lacquer are commonly used options, but final coating selection should take account of acidity, sulfur content, protein content, sterilization conditions and storage requirements.
Can tinplate lids be customized?
Yes. Depending on the project, tinplate can ends can be produced with different diameters, opening structures, internal coatings, material specifications and printed surface designs. Final feasibility should be confirmed according to the required lid structure and production quantity.
Conclusion
Selecting the right tinplate lid is a technical packaging decision involving much more than diameter alone. Lid structure, tinplate substrate, hardness, tin coating weight, internal lacquer, food characteristics, sterilization conditions and double-seaming compatibility should all be evaluated together.
Whether the project requires a standard tin can end, easy open end, full aperture EOE, peel-off end or custom printed lid, confirming the actual can dimensions and conducting sample seaming tests before mass production can significantly reduce compatibility risks.
For tinplate lids, easy open ends, tinplate sheets, printed tinplate or complete metal packaging solutions, contact GDD Metal with your can size, packed product, lid type, required coating and technical drawing for specification matching.