12mm (1/2") Neon Yellow Spiral Binding Coil [12" Long, 4:1 Pitch, 100 Sheet Capacity (approx)] (100/Box)
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12mm (1/2") Neon Yellow Spiral Binding Coil [12" Long, 4:1 Pitch, 100 Sheet Capacity (approx)] (100/Box)

Item #: 33P4NY1212
Brand: Binding101
  • 12mm (1/2") Diameter Neon Yellow Coils
  • Binds 91-100 Sheets (20 lb.) or a 13/32" Thick Stack
  • 4:1 Pitch (Standard) Hole Spacing
  • 12" Long Coils (Standard Letter Size)
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These 12mm spiral coils (1/2") will bind up to about 100 sheets of 20 pound bond paper, or about a 13/32" thick stack of pages. hey are blue coils that offer a bright, vibrant finish that goes well with many branding choices. They have standard 4:1 pitch hole spacing for perfect compatibility with any 4:1 pitch coil binding punch machine. These coil binders are 12" long for standard letter size pages measuring 11" on the binding edge; the extra 1/2" on each end is essential to allow for cutting/crimping-in of the ends. The plastic material makes them flexible, durable, and perfect for personal, education, or professional document bindings of all kinds. These spiraled binder spines are packaged with 100 coil spines per box.


Item # 33P4NY1212
Manufacturer Binding101
Manufacturer Item# P4NY1212
Color Neon Yellow
Size 12mm (1/2")
Sheet Capacity* 91-100 Sheets (20 lb. bond paper)
Recommended Book Thickness 13/32" (Loose Stack)
Pitch 4:1
Length 12"
Maximum Binding Edge 11"
Filament Diameter** 1.75mm
Binding Style Spiral Binding / Plastic Coil
Quantity 100 Coils / Box


Spiral binding plastic coils are one of the most popular traditional binding methods available. They consist of a continuous spiraled coil that is made of durable and flexible plastic and is rolled into holes along a binding edge. Spiral binding coils offer a more modern and durable way to bind books over the traditional comb spines, while still being affordable and simple to use. Another benefit of spiral binding coils over many other binding methods it that, coil bound books have the ability to flip pages completely around a full 360 degrees without damaging the contents, so they can lay flat and stay flat. This allows your book pages to flip all the way around from front to back for easy readability. They bounce-back to their original shape, even after heavy use and bending. Plus, the plastic material can easily be sanitized between users (just pair with contents that are laminated / fully encapsulated for an easy-to-clean solution).

If you are ready for one of the most durable binding spines available, then buy color spiral binding plastic coils online at Binding101 today. We have a huge selection of coil binders in-stock and ready for fast shipping to your home or office. Need some help choosing the right size for your individual needs? Read our guide below that can help you determine what kinds of coils you should select. Or, if you still need help, give our representatives a call at (866) 537-2244 .

What Kind of Coils Do I Need to Buy?

We offer a huge selection of spiral binding coils for you to choose from, most stocked in all our nation-wide USA warehouses for fast shipment and delivery. There are four different categories of coil to choose from, including the length of the coil, the pitch, the diameter (or coil size), and the color. Here are the steps to follow for how to choose the binding coils you need to buy.

1) Choose a Coil Length

First, choose your coil length. 12" coils are made for letter size pages and are the most popular choice. 36" length are a bit more specialty, primarily used by print shops are those wanting to make multiple books from one single coil spine. 36 inch length coils are also great for oversize and jumbo books.

Need a different length? You can easily cut down the above stocked coil lengths to the size you need, but sometimes that is not the most efficient option for larger quantities. If you need 100 or more coils of a specific length, consider custom cut coils instead. And remember to order 1" longer than your document length so you have that extra 1/2" on each end that allows for cutting/crimping in and finishing the bind.

2) Choose a Coil Pitch

Once you have chosen the length of your coil bind spine, choose your pitch. What is a binding pitch? Pitch refers to the holes per inch, or the hole spacing. They are reflected in a ratio that includes the number of holes, a colon punctuation, and then the inch measurement...for example, 4:1 is pronounced “four to one” and means that there are 4 holes for every 1 inch and 5:1 means there are 5 holes for every 1 inch.

4:1 pitch binding coil spines are by far the most popular, as it is the standard spacing for coils in the United States. About 98% of our customers order 4:1 pitch spiral bindings. The 5:1 is a specialty spacing that is manufactured primarily for print shops that have specialty equipment for punching the pattern, and users who may have machines manufactured in other countries where the 5:1 spacing is more common. You will want to check your spiral binding machine for compatibility before you buy spiral binders online.

3) Choose a Coil Size / Diameter

Now choose your coil size (diameter) for your document. You can use the coil bind capacity chart below to help choose the best size based on your stack thickness or your sheet capacity. Just note that the sheet capacity was calculated using sheets (not pages) that were all 20 lb. bond copy paper, without any covers; this means it can vary significantly depending on the stock you are using, which is why we recommend the stack thickness method instead. And remember: having a coil that is slightly too large is better than having a coil that is too small; a small coil won't allow pages to flip smoothly and can pinch them, tear more easily. So if you are between sizes, we recommend you size-up.

There is also a general rule with three simple steps to get the proper fit for spiral binding that works as well:

1. Take the pages and covers being bound and lay the stack flat on a table.

2. Measure the thickness of the stack, but don’t press down; let it lay naturally loose.

3. Add 1/8" to the stack thickness - that will be the size of the binding coil recommended for your document thickness.

Size (Millimeter)Size (Inches)Stack Capacity (Inches)Sheet Capacity* (20 lb. Bond)Filament Diameter
6mm 1/4" 5/32" Thick Stack 5-35 Sheets 1.6mm
7mm 9/32" 3/16" Thick Stack 36-47 Sheets 1.6mm
8mm 5/16" 1/4" Thick Stack 48-60 Sheets 1.6mm
9mm 23/64" 9/32" Thick Stack 61-70 Sheets 1.75mm
10mm 3/8" 5/16" Thick Stack 71-80 Sheets 1.75mm
11mm 7/16" 3/8" Thick Stack 81-90 Sheets 1.75mm
12mm 1/2" 13/32" Thick Stack 91-100 Sheets 1.75mm
13mm 17/32" 7/16" Thick Stack 101-110 Sheets 2mm
14mm 9/16" 15/32" Thick Stack 111-120 Sheets 2mm
15mm 19/32" 1/2" Thick Stack 121-130 Sheets 2mm
16mm 5/8" 9/16" Thick Stack 131-140 Sheets 2mm
17mm 0.67" 0.55" Thick Stack 141-150 Sheets 2mm
18mm 23/32" 5/8" Thick Stack 151-160 Sheets 2.08mm
19mm 0.748" 0.62" Thick Stack 161-165 Sheets 2.08mm
20mm 3/4" 11/16" Thick Stack 161-170 Sheets 2.08mm
22mm 7/8" 3/4" Thick Stack 181-200 Sheets 2.08mm
23mm 9/10" 4/5" Thick Stack 201-210 Sheets 2.08mm
25mm 1" 13/16" Thick Stack 211-230 Sheets 2.36mm
28mm 1-1/8" 7/8" Thick Stack 231-250 Sheets 2.36mm
30mm 1-3/16" 1" Thick Book 251-270 Sheets 2.36mm
32mm 1-1/4" 1-1/16" Thick Stack 271-290 Sheets 2.36mm
35mm 1-3/8" 1-1/4" Thick Stack 291-300 Sheets 2.36mm
38mm 1-1/2" 1-3/8" Thick Stack 300-320 Sheets 2.4mm
40mm 1-9/16" 1-1/2" Thick Stack 321-350 Sheets 2.4mm
45mm 1-3/4" 1-9/16" Thick Stack 351-390 Sheets 2.4mm
50mm 2" 1 -3/4" Thick Stack 391-440 Sheets 2.6mm

4) Choose a Coil Color

Lastly, choose your coil binding comb color. Stocked colors for most sizes and pitches include black, white, clear, royal blue, navy blue, red, and silver. The colors are solid, not coated, so even with heavy use and scratching, they will remain. Black coils are the most popular choice, while white and clear are close behind. Maroon and navy blue are popular choices for professional institutions, as they often match corporate branding. Red and royal blue are brighter and more vibrant than the others, so are more common for schools and other organizations where brighter colored coil bindings are needed.

If you have any questions, or are still not sure what kind of coil to buy, please call us at (866) 537-2244 for help.

* The sheet capacity rating above was calculated using all 20 lb. bond paper, with no covers and no other paper stocks. The actual sheet capacity will vary depending on what paper stock and covers you are using. For this reason, we recommend you use the stack capacity for a more accurate fit. All of these capacities are approximations. If you are between sizes, we recommend you size-up to allow for easier page-turning.

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