KAMsnaps KX8J Starter Snap Press Kit - Size 20 Plastic Snaps

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. 

Not sure? Try the variety size sampler kit which includes our most popular sizes / lengths.

------>>>>>> 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?


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 general applications including baby diapers, 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. Days for Girls menstrual pads are made with this size. This size has a strong grip so if you're working with more delicate fabric proned to 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 20 Extra Short (4.6mm prong) is good for thinner material where you still want a good, strong grip such as baby diapers made with just 1-2 layers of PUL.

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 14 (9.7mm or 3/8" cap diameter)

  • Size 14 Regular Length (3.5mm prong) is extremely short and should only be used on very thin material, usually single layers. 
  • Size 14 Extra Long (5.0mm prong) for situations when the regular length is not long enough such as when you have more layers or thickness.

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.
  • Click here to watch an overview of the KAMsnaps KX8J.

    The KX8J is the portable handheld version of our professional table press.  This starter bundle includes plastic snaps (size 20 regular length)and dies for all sizes of plastic snaps.  Click here for how-to videos instructions.

    IMPORTANT: The KX8J can install every plastic and metal snap, grommet, and rivet we carry, but if you want to install any size or style of fasteners not listed in this bundle, you will need to purchase additional die attachments that correspond to those added fasteners. For example, if you want to install size 20 fashion spring metal snaps, you will need to separately add dies for size 20 fashion spring snaps.  *Dies for the KX8J can also be used in the DK93 table press with a DK93-KX adapter should you ever want to use both tools.*

    Also recommended (you can add these from the drop-down menus above):
    • removal die set to quickly and safely remove plastic snaps incorrectly applied. See how it works.
    • additional size 20 regular length plastic snaps in black & white
    • set of color sampler charts with actual snap caps so you never have to guess which color best matches your fabric. Color cards may arrive with slight creases, wrinkles, etc.

    Note: Tools and fasteners on this site are made to work together and may not be compatible with those purchased elsewhere.

    International shipping: click here for international shipping discounts.
  • Everything you need to get started:
    • KX8J handheld press
    • Size 20 plastic snaps: 100 sets regular length in a rainbow assortment with matching dies
    • No-change dies for size 16, 20, 22, 24, heart, star, butterfly, and flower snaps
    • Hand awl to poke holes in fabric for snap placement
    • Screwdriver
    • Optional - from the drop-down menu above, you may choose to add:
      • removal die set to quickly and safely remove plastic snaps incorrectly applied. See how it works.
      • 200 sets white and black snaps in size 20 regular length
      • set of color sampler charts with actual snap caps to easily match snap colors with your fabric. Color cards may arrive with slight creases, wrinkles, etc.


  • Pliers and dies are industrial equipment and may have scratches, rust, oil or other cosmetic imperfections that will not hinder their function, and appearance may vary from images.  Remove any remaining oil on dies by attaching several snaps to scrap fabric. Returns or exchanges cannot be accepted unless a defect affects function.

    Warning:  Loose fasteners are a choking hazard - small parts. Not for children under 3 years.

    . eyelet grommet eyelets .

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