Aluminium Screw Caps
Aluminium screw caps are used for sealing containers such as bottles and jars, providing a secure and tamper-evident seal.
Aluminium Screw Caps are widely used as closure devices for bottled beverages, food, cosmetics, and other products. They are typically made of aluminum, featuring characteristics such as light weight, corrosion resistance, and recyclability.
These caps are typically made of aluminum, which is lightweight yet durable. The interior usually features a liner, such as foam polyethylene (EPE), to enhance the seal and protect the contents from contamination. The exterior of the cap can be customized with various finishes and colors to meet branding requirements.
Aluminium screw caps are widely used due to their lightweight, corrosion resistance, and recyclability. They are extensively applied in the food and beverage, pharmaceutical, cosmetics, and chemical industries.
Aluminium screw caps are typically made from high-purity aluminium alloys such as 1060, 8011, and 3105. These are supplied in sheet or coil form and processed through cutting, deep drawing, curling, knurling, and liner insertion. Surface treatments—most notably anodizing or protective lacquer coating—enhance corrosion resistance, provide decorative finishes, and support high-quality printing and embossing.
HC Bottle Cap Manufacturing Co., Ltd. has over 17 years of experience in providing different kinds of aluminum caps, plastic caps, aluminum-plastic caps, glass bottles, and other packaging products. Our products are exported to more than 20 countries around the world including the United States, Europe, South Africa, Southeast Asia, etc.
Aluminium Screw Caps Specifications Information
| Property | Details |
| Aluminium Alloys | 1050, 1070, 3105, 8011 |
| Liner Options | PE Foam, Composite Material, Pulp and Aluminium, Pulp and Polymer, Heat Seal, Pressure Sensitive, Plastic Sol |
| Surface Finishes | Brushed Aluminium, Polished, Anodized, Lacquer Coating, Color Coating (Silver, Blue, Black, Gold, etc.) |
| Diameter Range | 18 mm – 53 mm |
| Common Sizes | 28x15 mm, 30x21 mm, 30x35 mm, 30x60 mm, 53-400, 24-400, 18-400, 20-400 |
| Thread Type | Continuous Thread (CT), Roll-On Pilfer Proof (ROPP), Push & Turn |
| Customizations | Embossing, Debossing, Laser Engraving, Custom Logos |
| Certifications | FDA Approval, EU Food-Grade Compliance, ISO Standards |
| Cap Height Range | Short, Medium, Tall |
| Compatibility | Glass Bottles, Plastic Bottles, Metal Containers |
| Applications | Beverages, Food Products, Pharmaceuticals, Cosmetics, Personal Care, Automotive Oils, Chemical Products |
Our company relies on a strictly controlled production process to ensure that every step meets high standards, producing high-quality bottle caps. HC Bottle Cap Manufacturing Co., Ltd. ensures that every cap meets international standards in terms of appearance, performance, and quality, fulfilling various customer needs and providing premium packaging solutions.
Aluminium Screw Caps Material Composition
| Component | Material Composition/Description |
| Material | Made from lightweight and corrosion-resistant aluminium, with a surface typically coated with food-grade lacquer to enhance corrosion resistance and improve surface brightness. |
| Sealing Insert | EPE (ethylene propylene diene monomer) liner: used to achieve excellent airtight sealing performance. FDA-certified food-safe liners: compliant with food contact safety standards. Custom options: different liner materials such as PE foam liners and heat-seal liners can be selected based on product requirements. |
Aluminium Alloys Used in Aluminium Screw Caps
- 1060 Alloy: Primarily used for sealing small bottles; recommended thickness range is 0.15–0.30 mm, with widths from 30–1000 mm.
- 8011 Alloy: Commonly used where high stretchability and paint adhesion are required for caps; usually in H14/H16 temper with epoxy coatings or various colored paints.
- 3105 Alloy: A commonly used material for screw cap stock rolls, known for excellent deep-drawing performance and decorative potential.
These alloys offer balanced ductility, are suitable for deep drawing, possess sufficient strength to maintain thread integrity, and have good corrosion resistance, especially after anodizing or lacquer treatment.
Aluminium Screw Caps Thread Types
Compatible with standard threads such as SP410/400 and 38/400, ensuring broad compatibility with glass, plastic, or metal containers.
Thread Types Available from HC Aluminum
| Thread Type | Description |
| SP410/400 | The SP410/400 aluminium screw cap adopts the standard SP410/400 thread design. This thread specification features precise pitch and thread height, enabling a secure fit onto standard-diameter glass, plastic, or metal bottles. SP410/400 specifications are widely used in beverage, condiment, pharmaceutical, and personal care product packaging. The aluminium cap, through precision processing, ensures sealing performance, smooth screwing action, and easy opening, effectively preventing leakage and contamination. |
| 38/400 | The 38/400 aluminium screw cap is equipped with an internal thread structure conforming to the 38/400 thread standard, featuring a 38mm diameter and a unified 400 series pitch. It is commonly used for dairy products, juices, honey, health supplements, and personal care product containers. This aluminium cap provides stable locking force during screwing, perfectly matching plastic or glass bottle mouths. It supports repeated opening and sealing, suitable for high-demand packaging scenarios, ensuring product quality and user experience. |
| 28/400 | The 28/400 aluminium screw cap uses the 28/400 standard thread design, with a 28mm diameter and standard 400 series pitch. It is widely applied to perfume bottles, essential oil bottles, oral liquid bottles, and other small-capacity containers. This aluminium cap offers precise thread alignment and stable screwing, and when combined with food-grade or pharmaceutical-grade sealing gaskets, it ensures no liquid leakage and no gas escape. It is particularly suitable for high-sealing-requirement scenarios. |
| 33/400 | The 33/400 aluminium screw cap comes with a 33/400 threaded interface, commonly used in cosmetic bottles, personal care products, and specialty chemical packaging. This type of aluminium cap is designed to ensure sealing while also emphasizing user-friendly opening. Its thread precision enables reliable locking on glass, PET, or PE containers, preventing loosening and leakage during transport or storage. |
| 45/400 | The 45/400 aluminium screw cap is designed with a 45mm diameter 400 series thread structure, suitable for wide-mouth canned products such as milk powder, coffee, and nutritional supplements. This type of aluminium cap is typically used with high-density foam liners or heat-seal films to ensure excellent sealing and moisture resistance, meeting long-term storage needs. It is widely used in the food industry and health product sectors. |
Aluminium Screw Caps Quality Testing
At HC Bottle Cap Manufacturing Co., Ltd., we implement strict quality checks for every batch of aluminum screw caps to ensure that each cap meets customer requirements and complies with international standards.
| Testing Item | Description |
| Raw Material Testing | Testing the aluminum alloy composition, hardness, and corrosion resistance of the Aluminium Screw Cap to ensure the material meets requirements and has sufficient strength. |
| Dimensions and Tolerance Testing | Checking the outer diameter, inner diameter, thickness, and tolerances of the Aluminium Screw Cap to ensure precise dimensions and compatibility with bottle necks. |
| Surface Quality Inspection | Inspecting the surface of the Aluminium Screw Cap for defects, checking smoothness, and the uniformity of printed coatings to ensure a flawless appearance. |
| Sealing Performance Test | Conducting airtightness and pressure tests to ensure the Aluminium Screw Cap has a good seal to prevent leakage. |
| Torque Test | Testing the torque during the opening and sealing of the Aluminium Screw Cap to ensure ease of use without loosening or damage. |
| Corrosion Resistance Test | Conducting salt spray and humidity tests to ensure the Aluminium Screw Cap has corrosion resistance, suitable for humid and corrosive environments. |
| Torque and Seal Consistency Test | Conducting repeatability and consistency tests to ensure the sealing performance of each batch of Aluminium Screw Caps is consistent and meets quality standards. |
Aluminium Screw Caps Design Features
Threads: Aluminium screw caps are designed to fit specific bottle necks, with threads that make installation and removal easy. Depending on the closure system, the threads can be continuous or lug type.
Liner: The liner inside the cap serves as a sealing agent, preventing leakage and maintaining the integrity of the product. Common liner materials include EPE, foam, or pulp, each offering different sealing performance.
Tamper-Evident Features: Many aluminium screw caps include tamper-evident bands or seals that break upon opening, providing consumers with a visible product safety assurance.
Aluminium Screw Caps Hot-Selling Product Series
| Product | Description |
| 8X15MM Silver Aluminium Screw Cap | The 8X15MM silver aluminium screw cap, with its delicate design and silver appearance, is an ideal choice for a variety of bottled products. Its screw structure ensures the cap's sealing and reliability, widely used in the cosmetics, pharmaceuticals, and food industries, providing an elegant and secure closure. |
| 28X15MM Blue Aluminium Screw Cap | The 28X15MM blue aluminium screw cap, made from blue aluminium alloy, provides an aesthetically pleasing and sturdy appearance. Its screw design ensures a tight seal during use, making it suitable for various liquid or solid products, especially common in personal care products and beverages. |
| Black Aluminium Screw Cap | The black aluminium screw cap has a modern black appearance and robust structure, offering excellent sealing performance. It is widely used in the cosmetics, beverage, and pharmaceutical industries, effectively protecting the contents from leakage and contamination. |
| Gold Aluminium Screw Cap | The gold aluminium screw cap features a luxurious and classic gold appearance, adding a high-end touch to the product. Its screw design ensures a tighter closure, commonly seen in high-end cosmetics, beverages, and perfume packaging, both attractive and functional. |
| 30X35MM Aluminium Screw Cap with Pearl Cotton | The 30X35MM aluminium screw cap with pearl cotton lining combines high-quality aluminium with a pearl cotton liner, enhancing protection for the items inside the bottle. The cushioning effect of the pearl cotton prevents damage from external impact, widely used in precision instruments, cosmetics, and premium beverages. |
| Aluminium Screw Cap with PE Liner | The aluminium screw cap with PE liner enhances the sealing and moisture resistance properties, providing better protection for liquid or powder contents from external contamination. Its design is perfect for the pharmaceutical, cosmetics, and food industries, ensuring freshness and safety during transportation and storage. |
| 30X60MM Pressure Aluminium Screw Cap | The 30X60MM pressure aluminium screw cap is specially designed to withstand higher pressures, ensuring the contents inside the bottle remain sealed even under high-pressure conditions. Its sturdy structure and reliable sealing performance make it the preferred choice for chemicals, oils, and certain industrial applications. |
| 30X21 MM Silver Aluminium Distillation Bottle Cap | The 30X21MM silver aluminium distillation bottle cap is specifically designed for distillation bottles, offering a high level of sealing to prevent leaks. The silver appearance gives it a modern and fresh visual effect, suitable for packaging distilled spirits, essential oils, and perfumes, ensuring product purity and long-term preservation. |
Aluminium Screw Caps Features
Material Advantages
- Lightweight: Aluminium has high strength and lightweight properties, making it easy to transport and use.
- Excellent corrosion resistance: It effectively prevents chemical reactions between the contents and the external environment.
- Environmentally friendly: Aluminium is fully recyclable, meeting green and environmental requirements.
Sealing Performance
The precise thread design ensures a tight fit between the cap and the bottle opening, providing reliable sealing and extending the product's shelf life.
Barrier Properties
The inherent opacity and impermeability of aluminum help protect sensitive contents like wine or pharmaceuticals from oxidation and contamination.
Highly Decorative
Various surface treatments and printing options are available to enhance the brand image.
Types of Aluminium Screw Caps
| Type | Description |
| Standard Screw-On Cap | Standard screw-on caps are widely used in bottles for wine, beverages, and other packaging. They can be easily tightened manually or mechanically. Their simple and effective design ensures good sealing, preventing leaks and protecting the contents from contamination. These caps are suitable for most common bottled products, offering an economical and practical packaging solution. |
| Tamper-Evident Cap | Tamper-evident caps have a breakable ring design, commonly used in pharmaceutical and premium alcohol packaging. This design leaves clear marks when the cap is first opened, ensuring that consumers can easily identify if the product has been tampered with. This safety feature is crucial for enhancing product security and consumer trust. |
| Pressure-Sensitive Cap | Pressure-sensitive caps are particularly suitable for carbonated beverage bottles. Their design allows them to withstand pressure changes caused by gas release within the bottle. These caps offer excellent sealing, effectively preventing the escape of carbonation, and ensuring that the internal pressure remains stable. Pressure-sensitive caps are commonly used in beverage packaging that requires high-pressure sealing, maintaining product quality and taste. |
| Liner Seal Cap | Liner seal caps come with liners made from various materials such as PE, EVA, and are widely used in food and pharmaceutical packaging. The liners provide an additional sealing layer, effectively preventing external contaminants from entering while maintaining the freshness and quality of the internal product. This cap design ensures a high level of sealing, making it ideal for products that require tight protection. |
Aluminium Screw Caps Surface Treatment
| Surface Treatment | Description |
| Color Coating | Color coating offers a variety of color options that can be customized according to brand needs, enhancing the visual appeal of the product. Through this surface treatment, aluminium screw caps not only match the product packaging style but also increase overall market attractiveness, catching the attention of consumers. |
| Anodizing | Anodizing treatment uses an electrochemical process to form a hard oxide layer on the surface of aluminium, significantly increasing the cap's corrosion resistance and surface hardness. This treatment is suitable for premium products, offering more durable and corrosion-resistant performance, ensuring the stability of aluminium screw caps during long-term use. |
| Printing | Printing processes such as screen printing and offset printing allow brand logos, text, and patterns to be printed on the surface of the aluminium screw cap, helping brands showcase their unique image. This custom printing makes the product more personalized and enhances brand recognition. |
| Protective Lacquer | Food-grade lacquer can protect painted or printed surfaces. |
| Epoxy/Resin Coatings | Commonly applied to 8011 alloy caps to offer vibrant color options (yellow, gold, red, blue, black). |
| High-Quality Printing and Embossing | Capable of printing brand-specific logos, text, and tactile features. |
| Brushing | Brushing treatment involves finely sanding the surface of the aluminium, creating a unique metallic texture. This surface treatment not only enhances the decorative effect of the aluminium screw cap but also increases the product's premium feel, making it visually more attractive. |
Internal Lining Materials
The interior of aluminium screw caps features a variety of liner options, each tailored for specific product requirements:
a. Polyethylene (PE) Foam Liners
Features: Compressible and ensures a stable seal.
Applications: Ideal for general-purpose packaging, including beverages and food products.
b. Customizable Liner Options
Foam Seals: Versatile, providing excellent sealing for dry and liquid products.
Pulp and Aluminium: Combines the flexibility of pulp with the barrier properties of aluminium. Used for concentrated beverages and juices.
Heat Seals: Adheres to the bottle mouth using specialized equipment, ensuring tamper-evidence for products like sauces and condiments.
Pressure Sensitive Liners: Bonds to the bottle surface upon application, suitable for dry products, pharmaceuticals, and supplements.
Plastic Sol: Ensures a reliable seal during hot-fill processes, often used for sauces and liquids.
c. Liner-Free Screw Caps
Some aluminium screw caps are designed without liners, commonly used for products like candles or other dry items that do not require additional sealing.
Applications Based on Liner Type
| Liner Type | Applications |
| Pulp and Polymer | Concentrates, juices, honey, syrups, dry health foods |
| Pulp and Vinyl | Weak acids, bases, solvents, alcohols, oils |
| Polymer and Aluminium | Cosmetics, personal care, automotive and edible oils |
| Pressure Sensitive | Dry products, pharmaceuticals, vitamins, and supplements |
| Heat-Induction | Food, sauces, and tamper-evident packaging |
| Plastic Sol | Hot-fill foods, beverages, and sauces |
Aluminium Screw Caps Applications
| Industry | Application Description |
| Food Industry | Aluminium screw caps are widely used in sealing bottled liquids such as honey, olive oil, soy sauce, etc. Their excellent sealing performance effectively preserves the original flavor and freshness of food, prevents external contamination, and ensures product quality and safety during transportation and storage. |
| Beverage Industry | In bottled beverages like wine (red wine, white wine, spirits), carbonated drinks, juices, and mineral water, aluminium screw caps play a crucial role as sealing components. They ensure the safe closure of liquid in bottles, preventing leakage or contamination, and maintaining the original taste and flavor of the beverage. |
| Pharmaceutical Industry | In pharmaceutical packaging, aluminium screw caps are commonly used for medicine bottles, ensuring the seal and safety of the medication. Aluminium caps effectively prevent exposure to external factors during transportation and storage, preventing moisture, oxidation, or contamination, and ensuring the quality and efficacy of the medication. |
| Cosmetics Industry | High-end skincare products and perfume bottles often use aluminium screw caps, as they provide excellent sealing properties and a premium appearance. Aluminium caps not only protect the products from air and moisture but also enhance the overall refinement of the packaging, strengthening the brand's image. |
| Industrial Chemicals | In the packaging of industrial chemicals, aluminium screw caps are commonly used for sealing chemical solvents and lubricants. Their sturdy material and good sealing performance effectively prevent leakage of liquids, ensure the safe transportation of chemicals, and resist the corrosion of packaging materials by chemical components. |
Manufacturing Process
- Stamping: Aluminium sheets are processed into the initial bottle cap shape through stamping equipment.
- Thread Processing: Professional molds are used to process threads on the bottle caps, ensuring compatibility with the bottle mouth.
- Surface Treatment: Spraying, anodizing, or printing processes are performed according to requirements.
- Sealing Gasket Assembly: Sealing gaskets are installed for specific purposes to enhance leakage prevention.
| Process Step | Description |
| Coil Production and Rolling | Aluminum cap manufacturing begins with the production of hot-rolled or continuous cast billets, which undergo multiple cold rolling processes to reduce the aluminum material to the final required sheet thickness, typically 0.20–0.23 mm. The standard width of the coils ranges from 449 to 796 mm to meet the blanking needs of different cap specifications. This process ensures the aluminum material has uniform mechanical properties and good surface quality, forming the fundamental raw material preparation step before cap forming. |
| Cutting and Deep Drawing | Blanking: Large rolls of aluminum sheet are cut into circular “blanks” of the desired diameter, a step also referred to as “punching” or “shearing.” |
| Deep Drawing: The aluminum blanks are stretched through progressive stamping dies to form the initial structure with the cap top and skirt. This process demands high material ductility and mold precision, directly impacting the consistency and strength of the final product. | |
| Thread Forming, Curling, and Knurling | The deep-drawn aluminum cap semi-finished product undergoes multiple mechanical forming steps: |
| Curling: The edge of the cap body is processed into a standard threaded flange to enable screwing onto a standard bottle neck thread. | |
| Knurling/Ribbing: Regular patterns are pressed onto the surface of the cap skirt to enhance anti-slip grip during opening. | |
| Embossing (Optional): The brand logo or decorative patterns can be embossed on the top or skirt of the cap to enhance visual appeal and product identification. | |
| Liner Insertion and Assembly | To improve sealing performance and chemical compatibility, liners are typically inserted into the aluminum cap through automated processes: |
| Common liner materials include PTFE (Polytetrafluoroethylene), PE foam, EPE composite liners, heat-seal gaskets, or elastomeric materials. | |
| Liners are placed into the recessed area inside the cap top using heat pressing, dispensing, or mechanical insertion methods to ensure fixed positioning and good sealing performance. | |
| HC Aluminum Cap Quality Control | HC Aluminum implements a strict quality control system during production, including: |
| Dimensional Inspection: Key dimensions such as cap diameter, height, and thread structure are measured online or by sampling to ensure they meet design standards. | |
| Surface Inspection: Manual or automated visual inspection systems are used to detect surface defects such as scratches, dents, or stains. | |
| Seal Integrity Testing: Vacuum or air-tightness tests are conducted to verify the reliability of the liner seal. | |
| Lubrication/Cleaning/Sterilization Steps (Depending on Application): For caps used in pharmaceutical and medical packaging, additional processes such as anti-scratch lubrication, high-pressure spray degreasing, high-temperature sterilization, or irradiation sterilization are carried out to meet cleanliness and biosafety requirements. |
Advantages of Aluminium Screw Caps
- Cost-Effective: Compared to other metal bottle caps, aluminium screw caps are more cost-effective to produce.
- High Safety: Easy to unscrew without the need for additional tools, making it user-friendly.
- Design Flexibility: Supports various shapes, sizes, and surface treatments to meet personalized customization needs.
- Durability: The durability of the aluminium material ensures that the screw caps are not easily damaged during transportation and storage.
- Moisture Resistance: Excellent sealing performance effectively prevents moisture from entering, protecting the quality of the contents.
- Versatility: Suitable for food, beverages, pharmaceuticals, personal care, and chemical products.
- Customization: Multiple size, color, and liner options are available to meet different needs.
- Aesthetic Appeal: The surface of the aluminium caps can be treated with various processes such as spraying and anodizing to increase visual attractiveness.
Why Choose HC Bottle Cap Manufacturing Co., Ltd.?
At HC Bottle Cap Manufacturing Co., Ltd., our aluminum screw caps undergo strict quality testing to ensure that each product meets customer needs and industry standards. We not only focus on the functionality and safety of the caps, but we are also dedicated to enhancing their aesthetic design and user experience, so every bottle of product showcases high quality in detail.
Our products are widely used in various industries, including beverages, cosmetics, pharmaceuticals, and more, and have received global recognition from customers. We understand that only through high-standard quality control can we provide reliable packaging solutions and help our clients stand out in the market.
Choosing HC Bottle Cap Manufacturing Co., Ltd. means choosing quality, innovation, and trust. We look forward to working with you to provide the best aluminum screw cap solutions for your products.
Aluminium screw caps, due to their light weight, excellent sealing properties, and strong recyclability, have become an important choice in modern packaging.
The following bottle caps may interest you
Further reading : Aluminum ROPP CapBeer Aluminum Anti-counterfeiting Bottle CapLiquor Aluminum CapWhite Aluminum Bottle CapAluminum roll-printing and milling anti-counterfeiting bottle capWine Aluminum CapROPP Aluminum Caps for WaterBeverage Bottle Aluminum CapAluminum Caps for VinegarVodka Bottle Aluminum CapsBlack Aluminum Bottle CapRum Aluminum Screw Caps 30x35mmOlive Oil Aluminum CapAluminum Cap for Whiskey Alcohol Spirit Glass Bottle31.5x24mm embossing and milling Aluminum Cap for Alcohol Whisky VodkaAluminum Bottle Cap 30x60mm for Wine and Spirits Bottles30x35mm Aluminum Bottle Cap for Spirits and Alcoholic Beverages30x43mm Wine Aluminum Cap25x43mm Aluminium Pilfer Proof Bottle Cap30x44mm Aluminum Bottle Cap for Spirits28x18mm Aluminium Closure30x35mm Aluminium ROPP Cap30x60mm Hot Stamping Cover Wine Bottle Lids - Alcohol Whiskey Vodka Aluminum Bottle Cap28mm Beverage Drinks Aluminum Cap38mm Beverage Drinks Aluminum CapBeer Aluminum Bottle CapAluminum anti-counterfeiting bottle capPull-Off Aluminum Bottle CapTamper-Evident Aluminum Bottle Cap28mm Aluminum ROPP Cap28mm Aluminum Cap28x18mm aluminum bottle cap for Vodka28x18mm Aluminium Ropp Cap38mm Aluminum ROPP Cap38mm Aluminum Cap28mm Black Aluminium ROPP Tamper Evident Screw Cap with EPE Liner28mm Silver Aluminium ROPP Cap with Liner28mm 28-400 Aluminum Metal Cap with Pulp & Poly Liner28mm/410 Aluminium Cap with EPE Liner28x15mm Aluminium ROPP Cap26mm 42mm Ring Pull Aluminum Cap30x60mm Aluminum Vodka Tequila Caps30x60mm Aluminum ROPP Caps for Wine Glass BottlesPull Ring Easy Open Aluminum Crown Caps30×60 mm Aluminum ROPP Caps for Whiskey Glass Bottles250 ml Bottles 28×15 mm MCA Aluminum CapsBlue Aluminum Caps33x47mm Side Emboss Aluminum Lids