What materials are zipper moulds made of?

Modern zipper moulds are CNC-machined from titanium-aluminium alloy (most commonly TC-4 / Ti-6Al-4V) or hardened tool steel. TC-4 is the industry standard for slider dies because it combines hardness, dimensional stability and corrosion resistance — slider dies must stamp millions of cycles without losing tolerance.

How long does a zipper mould last?

A well-made TC-4 slider mould produces between 500,000 and 2,000,000 sliders before re-grinding is required, depending on slider size and tape thickness. Stop-moulds (top stop, bottom stop) typically last longer because each operation is less mechanically demanding.

How long does a custom zipper mould take to produce?

A custom OEM slider mould — from drawing to first sample — typically takes 25–40 days at a competent China factory. Stop and accessory moulds are simpler and can be produced in 15–25 days. Expedited timelines are possible but add cost.

What precision tolerance should a zipper mould hold?

Industry standard for slider die cavities is ±0.01 mm on critical dimensions. Anything looser produces sliders that jam, slip or fail pull-strength testing. Always confirm the supplier's CMM (coordinate measuring machine) inspection report.

Zipper Mould Buyer's Guide: Slider Dies & Custom Tooling (2026)

TL;DR — A zipper line lives or dies by the quality of its moulds. The default standard is TC-4 titanium-alloy CNC tooling at ±0.01 mm tolerance. Slider dies are the highest-stress moulds; stop and accessory moulds are simpler. A custom OEM slider mould takes 25–40 days from drawing to first sample.

What "zipper mould" actually covers

Buyers often use "zipper mould" loosely. In practice the term covers four distinct tool families, each with its own life and precision profile:

Mould family	What it produces	Stress level
Slider die	The zipper slider body (the part you pull)	Highest — stamps millions of cycles
Top stop mould	The metal stop at the top of the zipper	High
Bottom stop mould	The metal stop at the bottom (open-end or closed)	High
Accessory / puller mould	Decorative pull tabs, custom shapes	Lower — design-driven, not high-cycle

For full-line zipper production, you need at least the slider die plus one stop mould; pullers are optional but often customised for brand differentiation. Explore Jeso's zipper mould catalogue for the standard range.

The standard material: TC-4 titanium alloy

For slider dies and stop moulds, the industry default is TC-4 (Ti-6Al-4V) CNC-machined alloy. Why TC-4 and not steel?

Hardness without brittleness — TC-4 holds an edge under millions of stamping cycles where hardened steel can crack.
Dimensional stability — thermal expansion is low, so the mould stays in tolerance across long production runs.
Corrosion resistance — important for moulds used near brass-stamping or in humid factory environments.

Some budget factories still use hardened tool steel — it costs less upfront but typically delivers half the life and tighter maintenance schedules. For mid-volume or higher production, TC-4 is the lower total cost of ownership.

Precision: ±0.01 mm on critical dimensions

The single specification that separates a useful mould from a paperweight is tolerance on critical cavity dimensions. Industry standard is ±0.01 mm. Anything looser produces:

Sliders that jam mid-zipper or slip past the tape
Stops that don't hold under pull-strength testing
Visible cosmetic defects on premium product runs

Always ask the mould supplier for a CMM (coordinate measuring machine) inspection report on the first article. If they cannot provide one, you do not want their moulds.

Custom OEM moulds: realistic timelines

Mould type	Lead time (drawing → first sample)	Notes
Custom slider die	25 – 40 days	Most complex — multi-cavity design + sampling
Custom stop mould	15 – 25 days	Simpler geometry
Custom puller mould	15 – 30 days	Depends on artwork complexity
Modification of existing mould	7 – 15 days	Often the cheapest path to a "custom" look

Expedited timelines are possible at a 30–60% premium. Most experienced buyers do not rush — a hastily produced mould that fails first-article inspection costs more than the delay it saved.

What to verify before placing a mould order

Material certificate — request the alloy specification on the steel or TC-4 stock.
CNC machining type — 5-axis CNC for complex slider geometries; 3-axis is usually enough for stops.
Inspection report — CMM report on first article, with measurements at the critical cavity points.
Sample stamping — ask for a sample of zippers/sliders produced from the new mould before final acceptance.
Cycle-life guarantee — a competent supplier will warrant a minimum number of stamping cycles before re-grind.

How to choose a mould supplier (China)

Direct factory, not trader — moulds are technical; you need the engineer reachable, not a middleman.
Years of operation — mould engineering is craft knowledge; experience compounds.
In-house CMM — if they outsource measurement, they cannot iterate quickly on tolerance issues.
Existing reference customers — ideally in your region or your zipper family.
Sample policy — willingness to ship sample sliders for your line trial before bulk production.

Need a custom slider die or accessory mould?

Jeso (Primo Zipper Group) has manufactured zipper moulds for 40+ years — TC-4 CNC tooling, ±0.01 mm tolerance, in-house CMM inspection, OEM/ODM service. Direct from a China factory.

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Frequently asked questions

What materials are zipper moulds made of?: Modern zipper moulds are CNC-machined from TC-4 titanium-aluminium alloy or hardened tool steel. TC-4 is the industry standard for slider dies — hardness, dimensional stability and corrosion resistance under millions of stamping cycles.
How long does a zipper mould last?: A well-made TC-4 slider mould produces 500,000–2,000,000 sliders before re-grinding, depending on slider size and tape thickness. Stop-moulds typically last longer because each operation is less mechanically demanding.
How long does a custom zipper mould take?: A custom OEM slider mould from drawing to first sample typically takes 25–40 days. Stop and accessory moulds: 15–25 days. Expedited possible but adds cost.
What precision tolerance should a zipper mould hold?: Industry standard for slider die cavities is ±0.01 mm on critical dimensions. Anything looser produces sliders that jam or fail pull-strength testing. Always confirm the CMM inspection report.