24mm Aluminium Screw Cap
The 24mm aluminium screw cap is a widely used metal sealing accessory in industries such as personal care, cosmetics, food and beverage. It features lightweight design, corrosion resistance, and customizability.
The 24mm aluminium screw cap (also known as 24/410 or PP24) is a crimped closure widely used for PET, glass, and other types of bottles and containers. Made from aluminium alloy, it typically comes with EPE (expanded polyethylene) or pulp and polyethylene liners to ensure leak-proof sealing. Both the interior and exterior of the cap are coated to prevent corrosion and can be customized with color coating or decorative finishes. The screw thread design (24/410 continuous thread) complies with industry standards and is compatible with a wide variety of containers.
This screw cap is made from high-quality aluminium, offering excellent durability, lightweight structure, as well as resistance to corrosion, rust, and chemical degradation. It is ideal for environments requiring long lifespan and high reliability.
Customization options for the 24mm aluminium screw cap include embossing or debossing, perforated vents, multiple liner materials (such as heat-seal or pressure-sensitive liners), and various surface finishes (glossy, matte, brushed, metallic paint). These caps comply with food contact and pharmaceutical standards, and are typically packed in bulk cartons, making them suitable for high-volume applications.
24mm Aluminium Screw Cap Specifications
| Item | Specification Description |
| Nominal Diameter | 24mm (24/410 thread) |
| Thread Standard | Continuous 24/410 (also referred to as PP24 or SP410) |
| Overall Height | Approx. 12mm (depending on liner thickness) |
| Outer Diameter (OD) | 24mm (standard size, referring to the external width of the cap) |
| Inner Thread Diameter | Approx. 22mm (based on 1mm wall thickness; actual size depends on wall thickness) |
| Thread Type | Continuous thread (standard pitch), ensuring compatibility with corresponding container necks; thread length can be customized |
| Branding Customization | Logo/text can be laser-engraved, embossed, or screen printed |
| Structural Customization | Pitch, height, or liner materials (e.g., high-temperature resistant silicone) can be adjusted |
24mm Aluminium Screw Cap Materials and Structure
- Cap Material: High-purity aluminium alloy (typically 8011 or similar grade)
- Crimped Edge: Provides smooth edges and structural rigidity
- Coating: Interior and exterior coated with clear lacquer for corrosion resistance and to prevent interaction between metal and product
24mm Aluminium Screw Cap Design Features
- Enhanced Grip: Knurled or ribbed edges ensure safe handling even in wet environments
- Profile Options: Available in flat-top or dome-top designs. Flat tops are suitable for standard sealing, while dome tops offer more internal space
- Sealing Mechanism: Optional integrated EPDM/PVC liner or O-ring groove for airtight/waterproof sealing. Tamper-evident bands available for added safety
24mm Aluminium Screw Cap Liners and Sealing System
- EPE Foam Liner: Expanded polyethylene liner located inside the cap forms a leak-proof seal upon closure
- Pulp and Polyethylene Liner: Combination of pulp and polyethylene enhances chemical resistance, suitable for food-grade applications
- Heat-Seal and Foil: Used for tamper-evident or airtight seals
- Pressure-Sensitive Liner: Offers a peelable seal, suitable for child-resistant or high-value products
- FDA-Certified LDPE Seal Liner: Commonly used in food-grade gold lacquer caps
24mm Aluminium Screw Cap Surface Finishing and Customization
- Standard Finishes: Glossy, matte, brushed, metallic coatings (silver, gold, black, multicolor)
- Colored Coating and Decoration: Full-body color, two-tone coatings, hot stamping, screen printing
- Embossing/Debossing: Custom logos or text embossed or debossed on the cap top or edge
- Perforation/Venting: Controlled venting for certain pharmaceutical or special applications
- Natural Finish: Polished or brushed aluminum, offering a smooth metallic texture
- Anodizing Options: Enhanced corrosion resistance with a variety of color choices (black, red, blue, etc.)
- Coatings: Powder coating or epoxy coating for special chemical resistance/UV protection
24mm Aluminium Screw Cap Applications
Industries: Food & Beverage, Pharmaceuticals, Cosmetics, Automotive Fluids, Chemicals.
Uses: Sealing bottles, jars, tubes, or industrial containers. Suitable for liquids, powders, or granules.
- Food & Beverage: Jam, honey, sauces, condiments (requires food-grade liners)
- Pharmaceuticals & Health Products: Tablets, syrups, powders (requires tamper-evident liners)
- Personal Care & Cosmetics: Creams, lotions, serums (brushed metal finish enhances premium appearance)
- Chemicals & Industrial: Solvents, adhesives (requires chemical-resistant liners)
24mm Aluminium Screw Cap Standards and Compliance
- Thread Standardization: 24/410 continuous thread complies with ISO and ASTM closure standards
- Food Contact Compliance: EPE, LDPE, and aluminum foil liners comply with FDA and EU food contact regulations
- Pharmaceutical Grade: Liner systems and bottle coatings certified for USP Class VI parenteral container use
Technical Selection Recommendations
- High Sealing Requirements: Prioritize models with aluminum foil liners or double-thread structures
- Automation Line Compatibility: Ensure match with equipment torque specifications
- Special Environmental Needs: Choose high-strength aluminum alloy material or increase anodized layer thickness for enhanced weather resistance
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