3 Ring Binder Mechanisms Round Ring with Boosters [8-1/2" Binding Edge, Silver, 1", Round] 50 /Box

3 Ring Binder Mechanisms Round Ring with Boosters [8-1/2" Binding Edge, Silver, 1", Round] 50 /Box
98.250000 NewCondition InStock

3 Ring Binder Mechanisms Round Ring with Boosters [8-1/2" Binding Edge, Silver, 1", Round] 50 /Box

Item #: 113RBM85100R
Brand: Spiralbinding


If you've been looking for a way to make your own mini ring binders, then you've found the right place. At Spiral you can buy half size 3-ring binder mechanisms online and use them to make your own custom binders, unique swatches, journals, and so much more! These small ring binder spines are built specifically for a half-sheet of letter size paper, which measures 5 ½" wide and 8 ½" high. This is the exact measurement if you were to pull a regular piece of paper out of your printer and fold it in half, hence the name: half size!

Packaged in a box of 50 pieces, you can choose ring binder hardware in several different ring sizes from as small as 1/2" for a thin 1/4" stack, up to as thick as 2" for a thicker 1 ½" stack. Each mechanism features 3-rings for a traditional look, with the spacing adjusted to 2 ¾" between the rings. They feature boosters, which are the "ears" on each end that make opening and closing the rings easy and effortless, as well as a hole between the outside rings and the boosters that is the perfect fit for use with our binder rivets< to attach the mechanisms to a material of your choice. You will also need a rivet setter tool to bind the rivets and your mechanism firmly to the material of choice. Many customers choose to use a 90 point or so thick custom chipboard sheet.

Every application is unique, and we would love to see your creations; you can email photos of your finished projects to customerservice@spiralbinding.com.

Use the chart below to determine the best half size ring binder mechanisms for you.


Ring SizeSheet Capacity*Stack Capacity*
1/2"110 Sheets1/4" Thick Stack
3/4"150 Sheets3/8" Thick Stack
1"200 Sheets5/8" Thick Stack
1 ½"310 Sheets1" Thick Stack
2"450 Sheets1 ½" Thick Stack

* This is an approximation based on 20# bond copy paper. May vary depending on paper type. Stack thickness is the most accurate measure for ring capacities. Measure the stack without pressing it down.


ManufacturerUS Ring
Manufacturer Part NumberRINGMECHSHLF GRP
Quantity50 Mechanisms
Sheet SizeHalf Size [5 ½" W x 8 ½" H]
Number of Rings3-Rings
Ring ShapeRound Ring


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