6mm Spiral Binding Coils

Move up when the assembled document fills the 6mm coil too tightly or when covers and tabs prevent smooth turning. A proper fit leaves enough space for the sheets to rotate without pulling at the punched holes. Assemble the exact paper, front cover, back cover, and inserts, then measure the stack at the binding edge. Do not base the decision on paper count alone because heavier stock changes the stack thickness. If the larger coil leaves excessive space and looks loose, reduce the diameter. The right size supports free movement while keeping the document neat and controlled. It is better to allow a small amount of working room than to compress the stack into a coil that causes bowing or stress around the punched holes.

Pitch must match exactly. A 4:1 coil requires paper punched with four holes per inch along the binding edge. A coil cannot be made compatible with a different pitch by stretching it, skipping holes, or forcing it through the document. Confirm the pitch marked on the punch, die, or machine instructions before ordering. The available 4:1 spiral coil binding supplies include compatible coil options across multiple diameters. Also verify the coil length and the edge being punched because letter, landscape, and specialty formats may require different lengths. If the existing sample is unmarked, count the holes over one inch rather than judging the spacing visually. Exact pitch alignment prevents difficult insertion and distorted holes.

The coil should be slightly longer than the punched binding edge so there is enough material to trim and crimp at both ends. Twelve-inch coils are commonly used for letter-size sheets bound along the 11-inch edge. After insertion, leave a short extension at each end, cut away the excess, and finish both ends so the coil cannot unwind. A landscape document bound along a shorter edge may use the same stock coil with more trimming, while oversized formats may require a longer coil. Coil diameter and coil length solve different fit issues, so changing length will not correct a coil that is too tight around the document stack. Confirm both measurements before ordering, especially when several document formats share the same binding equipment.

Both ends should be cut and crimped after the coil has passed completely through the punched document. Crimping bends the tip inward toward the sheets, which helps prevent the coil from rotating out during use. Fine control matters with a small diameter because excessive pressure can flatten the coil or cut it too close to the first hole. Coil binding accessories include hand crimpers and fine-tip options for finishing spiral documents. Hold the tool in the correct orientation so the cutting jaw removes the excess while the crimping jaw turns the remaining end inward. Test the technique on a spare coil before processing a large batch, then inspect both ends for a smooth bend without sharp projections.