This 7mm Black spiral binding coil is designed for use in any 4:1 pitch spiral coil binding machine. ColorCoil offers a quality, professional look while binding documents up to 2" thick. Although these particular coils are Black we carry 4:1 pitch coil in more than 47 different colors and in sizes up to 32mm in diameter. These 7mm coils are designed to bind documents that are up to 5mm (3/16") including covers. Spiral Coil Binding is the perfect answer for documents that are frequently mailed or handled because of its durability: with Color Coil pages turn easily, books can lay flat or can be folded back-to-back.
| Coil Diameter | Fractional Equivalent (approx.) | Maximum Thickness of Document including Covers | Sheet Capacity (20# Bond) |
|---|---|---|---|
| 6mm | 1/4" | 4mm - 5/32" | 30 |
| 7mm | 9/32" | 5mm - 3/16" | 42 |
| 8mm | 5/16" | 6mm - 7/32" | 54 |
| 9mm | 11/32" | 7mm - 1/4" | 65 |
| 10mm | 3/8" | 8mm - 5/16" | 75 |
| 11mm | 7/16" | 9mm - 11/32" | 85 |
| 12mm | 15/32" | 10mm - 3/8" | 92 |
| 13mm | 1/2" | 11mm - 13/32" | 105 |
| 14mm | 9/16" | 12mm - 7/16" | 115 |
| 15mm | 19/32" | 13mm - 1/2" | 125 |
| 16mm | 5/8" | 14mm - 17/32" | 135 |
| 17mm | 21/32" | 15mm - 9/16" | 142 |
| 18mm | 11/16" | 16mm - 5/8" | 155 |
| 19mm | 23/32" | 17mm - 11/16" | 160 |
| 20mm | 3/4" | 18mm - 23/32" | 172 |
| 22mm | 7/8" | 20mm - 3/4" | 190 |
| 23mm | 15/16" | 21mm - 27/32" | 200 |
| 25mm | 1" | 22mm - 7/8" | 220 |
| 28mm | 1-1/8" | 25mm - 1" | 250 |
| 30mm | 1-3/16" | 27mm - 1 1/16" | 270 |
| 32mm | 1-1/4" | 29mm - 1 1/8" | 280 |
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