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Zipper Knowledge

Learn zipper components, materials, structures, and sizes to align with production and inspection.

1. Basic Structure

Teeth
Key for side strength; metal, resin, or nylon.
Slider
Slides to engage or separate teeth.
Top / bottom stops
Limit slider travel.
Pin & box
For separating open-end zippers.
Tape
Flexible tape carrying the teeth.

The slider engages teeth on both sides; reverse motion separates them.

Zipper structure
Zipper structure diagram(click to enlarge)

2. By Material

Type Material Applications Pros Cons
Nylon zipper Coiled nylon monofilament teeth Dresses, shirts, light apparel Light, flexible, good concealment Lower strength, wears faster
Resin (plastic) zipper Injected polyester (e.g. POM) teeth Pockets, hoodies, sportswear Wear-resistant, colorful Poor heat resistance above 150°C
Metal zipper Brass, aluminum, nickel silver teeth Denim, leather, workwear Strong, durable, classic look Higher cost; may oxidize

Resin sits between nylon and metal in cost; metal needs moisture/acid protection.

Nylon zipper sample
Nylon zipper
Resin zipper sample
Resin (plastic) zipper
Metal zipper sample
Metal zipper

3. By Structure

Closed-end
Closed-end

Fixed bottom; bags and pouches.

Open-end
Open-end

Separates fully; jackets and coats.

Two-way open-end
Two-way open-end

Two sliders; sleeping bags, long coats.

4. Sizes & Selection

Size number is tooth width in mm (e.g. #2, #3, #5, #7, #8, #10).

#2–#4Light fabrics
#5General apparel
#7–#8Heavy coats
#10 and aboveIndustrial
Common zipper size examples
Common zipper size examples

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