Dark Green Spiral Binding Coils

Coil diameter should be based on the thickness of the complete document, including front and back covers, inserts, tabs, and heavier sheets. Assemble the entire book, compress it gently at the punched edge, and measure the thickness. Select a coil that provides enough clearance for pages to turn without squeezing the book tightly. A coil that is too small can make the pages difficult to turn and place stress on the holes. A coil that is much too large may look loose and allow the contents to shift. Keep a sizing guide near the binding area and verify unusual paper stocks with a test book.

Coil length should correspond to the punched binding edge, not simply the paper name. Standard letter-size sheets bound on the 11-inch edge need a different length from landscape documents bound on the 8.5-inch edge. Ledger, legal, half-letter, and custom books require coils long enough to pass through every hole while leaving a small amount at each end for finishing. Longer plastic coils can often be trimmed to size using suitable tools. The main spiral coil binding supplies range includes options organized by length, pitch, diameter, and color, so each measurement should be confirmed before ordering.

Crimping cuts the coil to the correct length and bends each end inward, helping prevent it from rotating out of the punched holes during use. Simply trimming the coil without forming the bend can leave sharp ends and allow the spine to unwind gradually. Use proper coil-crimping pliers and orient them correctly so each end turns toward the document rather than away from it. Leave enough coil beyond the first and last holes to form a secure bend without creating excessive overhang. Test the finished book by turning every section and checking that the crimped ends do not catch on pages or covers.

The color can remain consistent across a document series, but the coil diameter must change with the book thickness. Thin reports need smaller diameters to keep the spine neat, while thick manuals require more clearance for smooth page turning. Do not use one diameter for every job merely to maintain visual consistency. Coil length and pitch must also remain correct for the punched edge and machine. When a workload includes many document thicknesses, MyBinding coil binding supplies provide multiple diameter and color choices that can help maintain a consistent appearance without sacrificing proper fit.