Reference Guide

Binding Spine Sizing Guide

Finding the right size binding spine can be tricky. Use the charts below to select the perfect spine for your project — choose by type using the tabs, then match your page count to the correct size.

Plastic Comb Spine Sizing Guide

MyBinding offers plastic combs in a wide range of sizes. Use the chart below to find the right comb for your project based on page capacity. Or you can find out how many pages your current supply can hold. Looking for plastic combs? Click here.

Plastic Comb Spine
Comb Diameter Guide
Comb Diameter (Inches) Paper Capacity (20# Paper) Shape
3/16"10 SheetsRound
1/4"25 SheetsRound
5/16"40 SheetsRound
3/8"55 SheetsRound
7/16"70 SheetsRound
1/2"85 SheetsRound
9/16"105 SheetsRound
5/8"125 SheetsRound
3/4"150 SheetsRound
7/8"175 SheetsRound
1"200 SheetsRound
1 1/8"225 SheetsRound
1 1/4"265 SheetsOval
1 1/2"320 SheetsOval
1 3/4"375 SheetsOval
2"425 SheetsOval
Combs 3/16" through 1 1/8" are round-shaped. Larger sizes (1 1/4" and up) are oval to better accommodate the extra pages.

Spiral Coil Spine Sizing Guide

MyBinding offers spiral coil in a wide range of sizes. Use the chart below to find the right coil for your project based on page capacity. Or you can find out how many pages your current supply can hold. Looking for spiral coil? Click here.

Spiral Coil Spine
Spiral Coil Diameter Guide
Coil Diameter (mm) Fractional Equivalent (Inches) Max Document Thickness Paper Capacity (20# Paper)
6mm1/4"4mm (5/32")30 Sheets
7mm9/32"5mm (3/16")42 Sheets
8mm5/16"6mm (7/32")54 Sheets
9mm11/32"7mm (1/4")65 Sheets
10mm3/8"8mm (5/16")75 Sheets
11mm7/16"9mm (11/32")85 Sheets
12mm15/32"10mm (3/8")92 Sheets
13mm1/2"11mm (13/32")105 Sheets
14mm9/16"12mm (7/16")115 Sheets
15mm19/32"13mm (1/2")125 Sheets
16mm5/8"14mm (17/32")135 Sheets
17mm21/32"15mm (9/16")142 Sheets
18mm11/16"16mm (5/8")155 Sheets
19mm23/32"17mm (11/16")160 Sheets
20mm3/4"18mm (23/32")172 Sheets
22mm7/8"20mm (3/4")190 Sheets
23mm15/16"21mm (27/32")200 Sheets
25mm1"22mm (7/8")220 Sheets
28mm1 1/8"25mm (1")250 Sheets
30mm1 3/16"27mm (1 1/16")270 Sheets
32mm1 1/4"29mm (1 1/8")280 Sheets
33mm1 1/4"30mm (1 1/16")290 Sheets
35mm1 3/8"32mm (1 1/4")310 Sheets
38mm1 1/2"34mm (1 9/32")330 Sheets
40mm1 19/32"36mm (1 7/16")350 Sheets
42mm1 11/16"38mm (1 1/2")360 Sheets
45mm1 3/4"41mm (1 5/8")390 Sheets
50mm2"46mm (1 13/16")440 Sheets
Choose a coil slightly larger than your document thickness to ensure easy page turning.

Twin Loop Wire Spine Sizing Guide

MyBinding offers twin loop wire in a wide range of sizes. Use the chart below to find the right twin loop wire for your project based on page capacity. Or you can find out how many pages your current supply can hold. Looking for twin loop wire? Click here.

Twin Loop Wire
Twin Loop Wire Diameter Guide
Wire Diameter Pitch Available Paper Capacity (20# Paper)
3/16"3:1 (32 Loops)5-20 Sheets
1/4"3:1 (32 Loops) and 2:1 (21 Loops)20-30 Sheets
5/16"3:1 (32 Loops) and 2:1 (21 Loops)30-50 Sheets
3/8"3:1 (32 Loops) and 2:1 (21 Loops)50-60 Sheets
7/16"3:1 (32 Loops) and 2:1 (21 Loops)60-80 Sheets
1/2"3:1 (32 Loops) and 2:1 (21 Loops)80-100 Sheets
9/16"3:1 (32 Loops) and 2:1 (21 Loops)100-120 Sheets
5/8"2:1 (21 Loops)110-140 Sheets
3/4"2:1 (21 Loops)140-160 Sheets
7/8"2:1 (21 Loops)160-190 Sheets
1"2:1 (21 Loops)190-220 Sheets
1 1/8"2:1 (21 Loops)220-250 Sheets
1 1/4"2:1 (21 Loops)250-280 Sheets
1 1/2"2:1 (21 Loops)280-310 Sheets
3:1 pitch (32 holes) is standard for most documents. Use 2:1 pitch (21 holes) for thicker, heavier documents.

Paper Weight & Cover Thickness Guide

Our sales staff are commonly asked about the thicknesses of the binding covers that we carry on our site. Understanding the way that cover stocks are measured can be somewhat tricky since several different measuring standards are used. This chart is designed to give you a quick overview of the different measuring standards used for the cover stocks that we carry.

Binding Covers
Cover Thickness Guide
Bond (Ledger) Offset (Text) Cover Tag Index Points / Mil Caliper (In) Millimeters Metric (g/m²)
16402237333.20.00320.08160.2
18452441373.60.00360.09267.72
20502846423.80.00380.09775.2
24603356504.80.00480.1290.3
28703964585.80.00580.147105.35
297340626060.0060.152109.11
31814573666.10.00610.155116.63
35904880746.20.00620.157131.68
35905082756.80.00680.173135.45
391005490817.20.00720.183146.73
401005693837.30.00730.185150.5
4311060100907.40.00740.188161.78
4411061102927.60.00760.193165.55
4712065108977.60.00760.198176.83
53135741221108.50.00850.216199.41
541377512511390.0090.229203.17
58146801341209.20.00920.234218.22
65165901501359.50.00950.241244.56
6717093156140100.010.25252.08
72183100166150110.0110.289270.9
76192105175158130.0130.33285.95
82208144189170140.0140.356308.52
87220120200180150.0150.38312
10526714624422017.50.01750.445385.06
Standard copy paper is 20# Bond (50# Text). Most binding covers are 80# Text or heavier. For premium covers, look for 10pt-12pt stock.

Fastback Strips Sizing Guide

Fastback binding strips are available in a variety of types and sizes. Each strip is capable of holding a range of the number of pages in your project. Consult the chart below to find the right size strip for your needs.

Fastback Strips
Size Super & Comp Strips Perfectback Strips CP Strips LX & LX Comp Strips Image Blanks
Narrow 0.5" Thick
~10-125 Sheets		 0.5" Thick
~10-125 Sheets		 0.3" Thick
~60 Sheets		 0.4"-0.7" Thick
~10-125 Sheets		 —
Medium 0.5"-1.0" Thick
~126-250 Sheets		 0.5"-1.0" Thick
~126-250 Sheets		 0.3"-0.5" Thick
~61-125 Sheets		 0.7"-1.0" Thick
~126-250 Sheets		 —
Wide 1.0"-1.5" Thick
~251-350 Sheets		 1.0"-1.5" Thick
~251-350 Sheets		 — — 1.5" Thick
~350 Sheets
Fastback uses thermal adhesive — the machine heats the strip to bind your document in seconds. No punching required.

Velobind / Surebind Sizing Guide

Velobind and Surebind spines are a fast and secure way to bind your documents. MyBinding offers multiple sizes to hold a range of page counts. Use the chart below to find the right size binding spine for your project.

Velobind Spine
Pin Length Capacity (20# Paper)
1" Pin250 Sheets
2" Pin500 Sheets
3" Pin750 Sheets
Velobind creates a tamper-evident bind — ideal for legal and archival documents. Pins lock into the strip and cannot be removed without a special tool.

ProClick Sizing Guide

MyBinding carries ProClick binding spines in a range of sizes. Use the chart below to find the right size for your job.

ProClick Spine
Size Capacity (20# Paper)
5/16"45 Sheets
1/2"85 Sheets
5/8"110 Sheets
ProClick spines are reusable and re-openable — perfect for presentations and documents you update regularly.

Metal Binding Spine Sizing Guide

Metal binding spines are available in a range of sizes that hold between 20 and 300 pages. Use the chart below to find the right size spine for your project.

Metal Spine
Size Capacity (20# Paper)
5mm20-35 Sheets
7mm35-50 Sheets
10mm50-75 Sheets
13mm75-110 Sheets
16mm110-150 Sheets
20mm150-190 Sheets
24mm190-230 Sheets
28mm230-265 Sheets
33mm265-300 Sheets
Always size up if your page count is near the top of a range — overfilling causes binding problems.

Thermal Cover Sizing Guide

Thermal covers are a fast and easy way to bind projects in a range of sizes. Use the chart below to find the right sized cover for your needs.

Thermal Cover
Size Capacity (20# Paper)
1/16"10 Sheets
1/8"25 Sheets
1/4"50 Sheets
3/8"75 Sheets
1/2"100 Sheets
Thermal binding requires a thermal binding machine. The glue in the cover spine melts and bonds to your pages in about 60 seconds — no punching needed.