Plastic Spiral / Coil Binding Capacity & Diameter Guide

Spiral Coil Binding SuppliesMany modern day spiral binding machines feature measurement guides to help determine which diameter coil is needed for a stack of paper. Many machines do not offer this feature though, so here is a quick reference guide to help you estimate how many sheets you can bind with your spiral coils.

Remember, there are two different pitches involved in spiral coil binding. One format is 4:1 pitch (four holes per inch) and the other is 5:1 pitch (five holes per inch). I will provide a quick reference guide for both hole patterns. Be aware that 4:1 pitch coils are available up to 1 ¼-inch (32mm) in diameter and 5:1 pitch is available in sizes up to 13/32-inch (20mm) in diameter.

Spiral Binding Quick Reference Diameter / Capacity Guide

(Based on 20# Paper)

1/4″ (6mm) – 20 Sheets
9/32″ (7mm) – 30 Sheets
5/16″  (8mm) – 40 Sheets
11/32″  (9mm) – 50 Sheets
13/32″ (10mm) – 60 Sheets
7/16″  (11mm) – 70 Sheets
15/32″ (12mm) – 80 Sheets
1/2″ (13mm) – 90 Sheets
9/16″ (14mm) – 100 Sheets
19/32″ (15mm) – 110 Sheets
5/8″ (16mm) – 120 Sheets
11/16″ (18mm) – 138 Sheets
13/16″ (20mm) – 152 Sheets
7/8″ (22mm) – 170 Sheets
1″ (25mm) – 200 Sheets
1 1/8″ (28mm) – 220 Sheets
1 3/16″ (30mm) – 225 Sheets
1 ¼” (32mm) – 230 Sheets

You can find our entire selection of spiral binding coil supplies here. You can also find our spiral coil binding machines here.

Keith Barlow

Keith is a third generation office equipment expert. ABC Office was started by his grandfather back in 1980 and he is proud to be caring on the values that made ABC Office what it is today… unsurpassed selection, detailed information, low prices, and courteous support.

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