Comprehensive Technical Analysis of 2925 Bottle Caps

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Commodity name: Comprehensive Technical Analysis of 2925 Bottle Caps

The 2925 bottle cap is a mainstream standard one-piece plastic screw cap in the bottled water and non-carbonated beverage industry. Named after its adaptation to the 2925 standard bottleneck (29mm outer diameter of the bottleneck, 25mm thread diameter), it is commonly known as "Xiaokang Kou" (widely adopted by leading brands such as Master Kong and Ganten) and is a core choice under the trend of lightweight packaging. Its entire process of design, production, and inspection strictly complies with the National Standard GB/T17876-2010 "Packaging Containers - Plastic Tamper-Evident Caps", which not only has market-oriented advantages of lightweight and low cost but also meets the safety and compliance requirements of food packaging. The comprehensive analysis is carried out from multiple dimensions as follows:

I. Basic Attributes and National Standard Positioning

1. Core Definition and Classification

What is a 2925 bottle cap?

Standard name: 2925 Plastic Tamper-Evident Cap (29/25 mm neck finish closure, in line with the definition of 3.1 in the national standard: made of plastic, unable to restore the original packaging form after opening)

National standard classification:

Cap structure: Linerless cap (mainstream design)

Manufacturing process: One-time molding cap

Application: Non-carbonated beverage cap (core adaptation to non-carbonated drinks such as bottled water and tea beverages)

Market positioning: Lightweight alternative cap, more in line with the cost optimization and environmental protection needs of modern packaging compared with the traditional 3025 cap

2. Core Specification Parameters (Market Conventional Values and National Standard Tolerances)

Parameter Item	Market Conventional Design Value	National Standard Requirements(Corresponding to 24-30mm Size Range)	Remarks
Adapted bottleneck	29mm outer diameter, 25mm thread diameter	Complies with the adaptation principle of "standard bottleneck" in Appendix A of the national standard; needs to be accurately matched with the bottleneck size	Not an explicitly specified specification in the national standard, but an industry-general adaptation standard
Cap Type	One-piece cold-fill cap with tamper-evident band (drop-off type / connected type)	Complies with the definition of tamper-evident band in 3.4 of the national standard (bridge connection, broken after opening)	tamper-evident band is a mandatory safety structure
Number of knurl	72 teeth	No explicit quantity requirement; needs to meet the needs of gripping and torque transmission	Mainstream market design to improve opening convenience
Standard Weight	1.25-1.30g (lightweight), 1.5g for heightened version	No direct weight requirement; needs to be optimized under the premise of meeting physical and mechanical properties	Lightweight design conforms to environmental protection trends and reduces costs
Maximum Outer Diameter (M)	29.0mm	Tolerance MT6a, allowable deviation ±0.70mm	Measured with a measuring tool with accuracy ≥0.02mm according to 6.2 of the national standard
Cap Height (H)	11.0mm (≤12mm)	Tolerance MT6b, allowable deviation ±0.90mm	Corresponding to the subdivided requirements of opening torque in the national standard
Thread Major Diameter (E)	25.0mm	Tolerance MT6a, allowable deviation ±0.70mm	Accurate meshing with the bottleneck thread is the key to sealing
Inner Plug Outer Diameter (P)	22.5mm	Tolerance MT6a, allowable deviation ±0.70mm	Core size of the double sealing structure

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