Two-Toned Engraved Sewing Machine

Size Guide
Choosing the Right Plastic Snap Size

Snaps are not one-size-fits-all.  If your snaps are too long for your fabric, they won't close properly.  If they're too short, they'll fall off. For this reason, it's important to choose the proper size / length for your material.

Which size works best for you will depend on a number of variables, such as the fabric you are using, its density and compression levels, how hard you are able to press, and your own personal preference.  For these reasons, we are unable to provide specific size recommendations for every scenario. 

------>>>>>> Download a printable pdf file showing each snap in its true-to-life size.

Plastic KAM Snaps Fasteners Size Comparison Chart - What Size Snaps Do I Have?


Dimensions of Size 20 Snap Parts


The 3 most commonly used sizes, in the order of popularity, are:

    1. Size 20 regular length
    2. Size 20 extra long (for thicker material)
    3. Size 16 regular length (for thinner material)

Size 20 (12.4mm or 1/2" cap diameter)

  • Size 20 Regular Length (5.6mm prong) is often used for lightweight to mid-weight fabric that isn't prone to tearing including baby diapers, menstrual pads, bibs, regular clothing, and household projects.   This is the most popular size of plastic snaps and is a good size to start with for most projects since most commonly used fabric fall within the desired thickness for this length. This size has a strong grip so if you're working with more delicate fabric at risk of tearing, consider size 16.

    ------>>>>>> Click here for sizing tips for baby & toddler clothing.
  • Size 20 Extra Long (6.2mm prong) is recommended for slightly thicker & denser material like double layers of standard marine vinyl for key fobs, medium weight leather, and chinese prefold diapers. (Some versions of these material may be so thick that they'll need larger/longer snaps.)

Size 16 (10.7mm or 7/16" cap diameter)

  • Size 16 Regular Length (4.6mm prong) is most commonly used for  projects that require a looser grip, such as doll clothes or reinforced stretch jersey.
  • Size 16 Extra Long is available in lengths ranging from 5.2mm - 7.2mm long for thicker material.

Size 22 (14.1mm or 9/16" cap diameter, 7.0mm prong)

  • A larger snap which can be used in similar situations as size 20 long-prong, or in situations where size 20 long-prong is still a little too short.

Size 24 (14.8mm or 9/16" cap diameter, 7.5mm prong)

  • Our largest, strongest snap which should only be used in very heavy duty applications with thicker material such as canvas tote bags, nylon webbing, dense leather and thick jackets. Because the grip is so strong, it can tear through more commonly used fabric.

Limited run.

Available in:

  • 25 engraved caps only, or with 25 white plain caps, sockets & studs to make 25 complete sets
  • Size: 20 (12.5mm - 1/2")
  • Stem Length: (Regular 5.6mm)
  • Finish: Glossy CPSIA Compliant: Phthalate, Lead





Customer Reviews

Based on 2 reviews
Charlain D Jorgensen
Love making purses so...

I used to lug a large press my husband had into the house to install my rivets in my purse handles and most of the time they didn't line up and I would have to redo them - IF I could find the hole I made with an awl again. With this press, I bought the hole cutter and I have enjoyed the process of making purses so much more! It may seem heavy but it is around 1/4th of the weight of the press I was using. So far after making many purses, I haven't had any of the rivets that were misaligned! I really love this press! So easy to use - make a hole with the cutter (yes, it cuts very cleanly) and change to the rivet installer and you are done before you know it!

Judith Rich

bought big table model press, and lots of parts, sorta expensive, I'm not a company, just like to make things. When I got my order they included some of the cute snaps with pictures on I have to get more snaps with lots of pictures on them, Is that a way to sell more? It is working. But the press is so easy for me to use, doesn't hurt my hand like the hand held press. So I'll be ordering more stuff, please have more sales. Judith.

Back to the top