Spiral Binding and Wire-0 ™ Binding are often spoken of interchangeably, but there are some minor differences between the 2 styles. (See photo above)
Wire-O Binding

This binding is also sometimes referred to as Wiro, twin loop binding, or mechanical binding to name a few. The wire mechanism comes in a few standard colors such as Black, White, Brass ( or gold) and Silver. The mechanism is clamped shut with pressure to a semi-permanent method of binding. There are other variations of wire- o binding in terms of material (painted metal, or plastic coated).
The benefit of Wire-O style binding is all pages layflat and the sheets can flip a full 360 degrees.
Wire-o comes in a range of standard diameters from 5/16″ to 1.25″
There are 2 main types of binding, it should be something worth checking with your binder before specifiying wire-o binding. It’s called the “pitch” . Some machines are 2:1 pitch and others are 3:1. It refers to how many loops/holes per inch. (pictured above is 2:1 pitch on a workbook).

means 3 twin loops per inch
Spiral Binding

Spiral Binding is also sometimes called coil binding or plastic coil binding. The plastic binding is one continuous spiral shaped piece that winds on to pre- punched holes and is secured off at top and bottom. Most often, Spiral binding is considered the lesser or the 2 styles in terms of professionalism or perceived value.
Both spiral and wire-0 bound books lay flat and flip over 360 degress. The Spiral bound book will have a slight offset to left and right pages as shown in the picture below. The Wire-o bound book will open with no offset on left and right pages (slight difference that may not matter, depending on the end use.
Generally speaking as the production cost between the 2 styles may be fairly close in price, but there are some subjective or “other reasons” for choosing one binding method over the next. Spiral bound workbooks are quick and easy to produce and they may be suitable for children’s educational booklet and other types of seminar information, etc. Both spiral and Wire-O are used in cookbooks, planners, journals, workbooks, music books and more. The spiral mechanism is generally plastic coated, but there are fancier stainless steels and copper spiral mechanisms that are very fancy.


I do hope you have found this helpful. The final end use of your book usually predicates the route to go on binding and finishing. We are here to help answer any questions on your next project. Let me know how we can be of any assistance!
Sincerely,
Martin Pugh
Book Publishing Manager
martinp@marathonpress.net