6 Best Snap Fasteners For Alternative Closures To Try
Discover the top six snap fasteners for durable, stylish closures. This guide compares materials and applications to help you upgrade your sewing projects.
Choosing the right closure for a hand-knitted garment is just as critical as selecting the perfect yarn weight or needle size. While buttons are a classic choice, snaps offer a sleek, modern, and highly functional alternative for cardigans, baby clothes, and accessories. Understanding the mechanics of different snap types will save you from the heartbreak of a fastener pulling through your delicate stitches. This guide explores the best hardware options to ensure your hard work stays secure and looks professional.
Dritz Heavy Duty Snaps: Best for Outerwear
When you’ve spent weeks knitting a heavy wool coat or a structured jacket, you need a closure that can withstand significant tension. Dritz Heavy Duty snaps are built for exactly this kind of rugged use.
These snaps are designed to grip firmly, meaning they won’t pop open when you’re moving around in your winter gear. Because they feature a reinforced design, they are far less likely to warp or lose their "click" over time.
However, keep in mind that these require a specific setting tool. If you aren’t careful during installation, the metal can be unforgiving on your fingers. Always practice on a swatch of scrap yarn before committing to your finished garment.
Prym Sew-On Press Fasteners: Best for Knits
For those delicate cardigans where you don’t want to risk damaging the fiber with a hammer or heavy-duty press, sew-on fasteners are your best friend. Prym’s version is a staple in my notions bag for a reason.
Because you attach them with needle and thread, you can distribute the tension across a wider area of the knitting. This prevents the "puckering" effect that often happens when metal snaps are punched directly through a knit fabric.
They are particularly useful for fine-gauge sweaters where you want an invisible closure. Just ensure you use a strong, matching thread and take small, secure stitches to anchor the fastener deep into the garment’s structure.
KAM Snaps Plastic Sets: Best for Baby Gear
If you are knitting for infants, safety and comfort are your absolute priorities. KAM Snaps are made from durable plastic, which means they are lightweight, hypoallergenic, and won’t feel cold against a baby’s skin.
The real beauty here is the variety of colors and the ease of use. You can easily color-match them to your hand-dyed yarns to create a seamless, professional look that looks like it came straight from a boutique.
Be aware that these require a dedicated plastic snap press. While the initial investment for the tool is higher, the cost-per-snap is incredibly low, making them ideal for high-volume projects like baby onesies or bibs.
YKK FlexFix Snaps: Best for Heavy Fabrics
YKK is the gold standard for fasteners, and their FlexFix line is engineered for high-performance applications. If you are working with dense, felted wool or thick, double-stranded projects, these are the heavy hitters you need.
These snaps feature a unique design that allows for a smooth, consistent closure even after repeated use. They are designed to handle the "tug" of thicker fabrics without the metal fatigue that plagues cheaper alternatives.
The trade-off is that they are quite industrial in appearance. I recommend these for utilitarian pieces like heavy-duty vests or workwear-inspired cardigans rather than delicate lace or fine-weight garments.
Singer Metal Sew-On Snaps: Best for Linings
Sometimes the best way to secure a knit garment is to hide the hardware behind a lining. Singer’s metal sew-on snaps are perfect for this, as they are low-profile and incredibly reliable.
If you’ve lined your sweater with silk or cotton to add warmth or structure, these snaps provide a clean finish. They sit flat against the fabric, preventing the "bulge" that can sometimes occur with bulkier snap systems.
They are also excellent for securing inner pockets or overlapping plackets. Because they are hand-sewn, they are gentle on your yarn and won’t cause the snagging that can happen with pronged metal fasteners.
Snap Source Baby Snaps: Best for Delicate Items
When working with fine-weight yarns like lace or fingering, you need a snap that won’t overwhelm the fabric. Snap Source offers specialized baby snaps that are smaller and more refined than standard hardware.
These are perfect for delicate accessories like baby bonnets or light, airy cardigans. Their smaller footprint ensures that the weight of the snap doesn’t cause the knitting to sag or distort under the fastener.
Always remember to use a small scrap of interfacing or a piece of ribbon on the inside of the knit before setting these. This provides a stable anchor and prevents the snap from pulling through your fine stitches.
How to Choose the Right Snap Size for Your Knit
Matching your snap size to your gauge is the secret to a professional finish. If your knit is bulky, a tiny snap will be swallowed up and won’t hold the weight of the fabric.
- For Fingering/Lace Weight: Use 6mm to 8mm sew-on snaps.
- For Worsted/DK Weight: Use 10mm to 12mm snaps.
- For Bulky/Super Bulky Weight: Use 15mm+ heavy-duty snaps.
Always consider the "pull" of the garment. A cardigan that fits snugly will put more stress on the closure than a loose, oversized sweater.
Proper Stabilization for Snap Application
Never attach a snap directly to a single layer of knit fabric. Knitting is, by nature, elastic, and a snap will eventually stretch the hole into a gaping, unsightly mess.
Always use a piece of lightweight fusible interfacing or a strip of cotton ribbon on the wrong side of the fabric. This creates a "dead" zone that doesn’t stretch, giving the snap a solid foundation to grip.
If you don’t have interfacing, a small square of tightly woven fabric (like quilting cotton) works perfectly. Simply sandwich the knit between the snap and your stabilizer to ensure longevity.
Installing Snaps Without Damaging Knit Fabric
The biggest mistake knitters make is punching a hole through the yarn. Instead of cutting the fibers, use a blunt needle to gently push the yarn strands aside to create an opening.
If you must use a tool that pierces, make sure you have reinforced the area heavily with thread or interfacing first. If you hear a "pop" while installing, you have likely snapped a strand of yarn; stop immediately and reinforce the area.
When setting metal prongs, always use a scrap of felt or interfacing between the prong and the yarn. This acts as a buffer and prevents the metal from cutting the fibers over time.
Troubleshooting Common Snap Fastener Issues
If your snap is popping open too easily, it may be due to the fabric being too thick for the prong length. Ensure the snap components are fully seated before applying pressure with your setting tool.
If the snap is pulling out of the fabric, your stabilizer wasn’t strong enough or the hole was too large. You can often fix this by sewing a small patch of fabric over the back of the snap to distribute the tension.
Finally, if the metal is tarnishing or snagging, check that you aren’t using a cheap alloy. Investing in high-quality brass or stainless steel hardware is worth it to protect your hours of hard work.
Selecting the right snap is a final, vital step in honoring the time you spent at your needles. Whether you choose the industrial strength of YKK or the delicate touch of a sew-on fastener, always prioritize the health of your yarn. With proper stabilization and careful installation, your hand-knitted pieces will remain functional and beautiful for years to come. Happy knitting, and may your closures always be as secure as your stitches.
