A small label hides two decisions
A maker requests a No.3 closed-end coil zipper. Another option is labelled No.5 VISLON open-end. These differ in more than size, yet the opening function cannot be deduced from coil versus VISLON. YKK’s standard No.3 coil matrix includes open-end and two-way forms as well as closed-end; its No.5 VISLON row also spans those functions. A shortened shop title has lost an important part of the specification.
Construction still matters after the function is settled
YKK describes standard coil as having coiled elements and being more flexible than metal or VISLON. VISLON uses resin elements moulded onto the tape. These give the maker a real construction choice to discuss for the garment, instead of treating every separating zipper as the same object in another colour.
A need for a more flexible closure may point the discussion toward a suitable coil option. It does not establish that the specific closed-end No.3 candidate can replace the open-end item requested by the garment plan. Resolve that mismatch independently rather than allowing the desirable construction to carry the wrong opening function into the purchase.
Keep the complete choice on the order
Keep the required family, size and opening form together when asking the maker or supplier for an exact option. If open-end coil is the intended solution, ask for that documented form instead of assuming VISLON is the only separating route. If the project deliberately requires VISLON, preserve that decision as well. The useful result is a named combination of function and construction, not a brand-family shortcut that silently changes one of them.
Sources & further reading
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