Choosing the Right Zipper

Sailrite^® stocks zippers in the following sizes:

Size #4.5: Used for small home décor projects such as cushions, pillows and purses.

Size #5: Used for medium-sized projects such as cushions and upholstery, duffle/tote bags, backpacks and jackets.

Size #10: Used for large projects such as sail packs, boat covers, marine enclosures and tents.

Size #12: Used for large projects such as marine canvas, outdoor gear and portable shelters.

Size #15: Used for very large projects such as oversized sail packs and covers, large tents, and portable buildings and greenhouses.

Let’s start with molded tooth. The molded tooth zippers we carry are made from DuPont Delrin^® Acetal Resins molded onto zipper tape. (YKK^® molded tooth zippers are called VISLON^®; Lenzip^® doesn't use a special term.) This construction makes them strong and practically weatherproof. Molded tooth zippers are the most common option for marine projects because they’re UV and corrosion resistant. We stock molded tooth zippers in sizes #5, #10, #12 and #15.

Coil zippers feature nylon teeth that, as the name implies, look coiled. The teeth are sewn onto the side tape with polyester thread. Coil zipper teeth are stronger and more flexible than molded tooth zippers, making them a great choice for indoor and outdoor projects with curves. Just note that polyester thread breaks down in the sun, so coil zippers should be kept covered to protect them from UV exposure in outdoor projects. We stock coil zippers in sizes #4.5, #5 and #10.

Metal zippers have polished metal teeth that secure together on the zipper chain. Because they can corrode, we recommend not using metal zippers for outdoor projects. They are ideal for bags and purses, backpacks, interior cushions and upholstery, and more. You'll find a selection of metal zippers on our website.

"Continuous" and "finished" are terms that refer to the length and style of a zipper as a whole. Finished zippers are called this because they come with stops, sliders, and sometimes a starter box and pin preinstalled. You don’t have to add any parts to a zipper like this — it’s already finished. Within the category of finished zippers, there are separating and non-separating zippers.

Separating zippers are sometimes also called "jacket zippers" because they are most commonly used on coats and jackets. They feature a starter box and pin at one end of the zipper tape and stops at the other end. These zippers are used for applications where the sides of the zipper should separate completely, such as on a coat, a genoa sleeve or the side panels of a cockpit enclosure. You can even get water-repellent separating zippers!

On the other hand, the two halves of non-separating finished zippers don’t come completely apart. They have preinstalled sliders and stops, but no starter box or pin. Sailrite carries two varieties of non-separating finished zippers: bridge top and bag style. Both of these zipper types have permanent stops at both ends, but bridge top zippers have one slider while bag style zippers have two. Non-separating finished zippers are good for bags, jacket pockets and more.

All styles of finished zippers come in preset lengths, but you can cut them shorter if needed. Just make sure you add stops to the cut end or sew it into your application so you don’t lose your slider!

A continuous zipper is a little different. These zippers do not have a beginning or end point (no preinstalled starter box or zipper stops). You can order continuous chain in preset lengths and cut it to the length you need for your project. These zippers do not come with sliders, so you will have to purchase one separately and add it to the zipper chain. Continuous zippers are usually sewn into a project — like a bag, tent or cushion — at one or both ends. If you don’t sew one or both ends of your continuous zipper shut, you can add stops to the chain to keep the slider from falling off the end(s).

Now that we've covered zipper chain, let's turn to sliders — the piece that zips and unzips the chain. Locking zipper sliders have a small lock mechanism that keeps the slider in place unless the tab is pulled. This prevents the slider from moving on its own even if the zipper tape is forced apart or if the center of the slider is pushed. Locking sliders are great for trousers, jacket fronts or any other application where you need the slider to stay put until you unzip it.

Non-locking sliders, on the other hand, allow the zipper to separate by pushing or pulling on any part of the slider or even by pulling the zipper teeth apart. This is useful for applications where you need to be able to quickly separate the zipper, like a genoa sleeve or spinnaker sock.

We stock locking sliders for coil and molded tooth zippers, as well as non-locking sliders for coil, molded tooth and metal zippers. You can get metal or plastic zipper sliders, which both have their pros: Metal sliders are stronger, but plastic sliders resist corrosion.

Single-pull sliders have a pull on just one side. The zipper can only be opened or closed from the side that has the pull on it. Think of most jackets, cushions, purses and other similar items. You’d only need to open and close these zippers from the outside, so there’s no need to have two pulls on the slider.

On the other hand, double-pull sliders do have two pulls — one on the front of the slider and one on the back. This allows the zipper to open from either side. Double-pull sliders are great for projects like tents and enclosures, which you would need to unzip from both the inside and the outside.

We stock single-pull sliders for all three zipper chain types and double-pull sliders for coil and molded tooth zippers.