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Letter Size 3-Ring Binder Mechanisms (Price per Box)


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Sometimes called ring binder parts or ring binder hardware, ring mechanisms are the spine pieces found on the inside of ring binders. These ring binder spines are letter size for standard 8 ½" x 11" sheets. They feature three rings with standard 4 ¼" spacing between the rings, two boosters for easy ring opening, and holes on each end for use with binder rivets and a rivet setter tool.

Ring binder mechanisms are a popular solution for making your own custom binders, unique display swatches, and much more. You can buy letter size 3-ring binder mechanisms online in ring sizes from 1/2" up to 4", some sizes available in both round and slant-d ring style options. All sizes are available in silver mechanisms, and several sizes are also available in black and brass colors. We sell ring binder mechanisms in full boxes; depending on the color and ring size, the quantity per box will vary. Make a selection below to see the packaged quantities.

Starting at: $41.50
Qty/Pack : Make a selection above to see pieces per box

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Binder Mechanism FAQs

Q: What capacity are the rings?
Sheet capacities vary depending on the ring size you choose. View the Chart in the product description for details.


Q: Do you have slant-d mechanisms?
Slant-D style rings are available on select sizes for the silver mechanisms.


Packaged Quantities:

  Mechanism     Ring Size     Qty/Bx  
  Silver     All Sizes     50  
  Black & Brass     1/2"     200  
  Black & Brass     3/4"     200  
  Black & Brass      1"     160  
  Black & Brass     1 ½"     144  
  Black & Brass     2"     54  


Product Description

Letter size ring binder mechanisms are the spine piece found on the inside of ring binders and work for 8 ½" x 11" standard letter sized papers. They feature 3-rings with traditional ring spacing of 4 ¼" between each ring, so work seamlessly with any traditional 3-hole punch. Use ring binder spines as a way to securely bind loose, hole-punched pages, or as a unique way to create swatch books and custom ring binders. You can pair with our binder rivets and rivet setter tool to bind the ring binder hardware onto a custom chip board sheet.

These metal binder parts are available in three colors: silver, black, and brass. Traditional silver binder mechanisms are available in the full range of ring sizes from 1/2" up to 4", many of those sizes also available in either round ring or slant-d ring options. They offer the most versatility, and are our most popular option because of their traditional and clean look, as well as their packaging with 50 mechanisms per box. Black and brass colored binder mechanisms are available in select sizes from 1/2" to 2", all with round ring styles. The packaging for colored ring binder spines varies depending on the ring size, but all you have to do is make a selection above to see the quantity per box. All colors are made of a durable metal material, and feature two boosters for easy ring opening and closing, as well as holes on each end that allow use with our binder rivets for binding the spine onto an item of your choice.

Below is a ring binder capacity chart that will help you determine what size ring you need, depending on the thickness of materials you need to bind. The sheet capacity is an approximation that was determined using standard 20 lb. bond copy paper; so please keep this in mind when looking at your own sheets. We have also rated each size with a "stack capacity" which is more accurate and won't change depending on the materials you are binding, because a 1" stack of 20 lb. paper is the same thickness as a 1" stack of 110 lb. index stock.


  Ring Size     Sheet Capacity*     Stack Capacity  
  1/2"     110 Sheets     1/4" Stack  
  3/4"     150 Sheets     3/8" Stack  
  1"     200 Sheets     5/8" Stack  
  1 ½"     310 Sheets     1" Stack  
  2"     450 Sheets     1 ½" Stack  
  2 ½"     540 Sheets     2" Stack  
  3"     650 Sheets     2 ½" Stack  
  4"     850 Sheets     3 ½" Stack  


* Approximation based on standard 20 lb. bond copy paper. May vary depending on paper stock.


Manufacturer US Ring
Quantity Make a selection above to see pieces per box
Product Type Binder Mechanisms
Sheet Size Letter Size [8 ½" W x 11" H]
Number of Rings 3-Rings
Ring Spacing 4 ¼" Between Rings [Center to Center]
Ring Shape Round Ring & Slant-D Ring Available
Sheet Capacity* [Stack Thickness] Varies Depending on Ring Size
Boosters Yes

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