5:1 Spiral Coil Binding Supplies

Measure your finished stack thickness with covers and any tabs included, not just the printed page count, since paper weight and add-ons change the real thickness more than people expect. 5:1 pitch is generally used for larger coil diameters on thicker documents, so if you're already working in this pitch, you're likely binding something substantial enough to benefit from the tighter hole spacing it provides. Lay the full stack flat, measure it without pressing it down, and add a small margin so the coil isn't forcing its way through a stack that's actually a bit thicker than it looks compressed.

No. Even though both are plastic spiral coils that look similar sitting side by side, the hole spacing is different enough that a coil built for one pitch will not thread cleanly through paper punched for the other. Forcing it usually results in a coil that catches, buckles, or simply won't spin all the way through the stack. If you're regularly running low on 5:1 coil, it's worth keeping a small buffer stock on hand specifically, since there's no quick substitute available from a standard 4:1 supply.

Generally no, as long as the crimper you have is rated for the coil diameter you're finishing, since crimpers respond to the physical size of the coil end rather than the pitch of the holes it was threaded through. What does matter is diameter range, so check the rated range on your tool, or browse crimpers for coil binding machines if you're finishing larger 5:1 coils and aren't sure your current crimper is rated for the size. Cutting the coil without a proper crimp leaves the ends free to unwind, which defeats the purpose of finishing the bind carefully in the first place.

Match the coil length to the binding edge, then add a bit extra for insertion and crimping room on both ends, the same rule that applies across every coil pitch. Standard coil comes in 12 inch lengths for letter-size binding edges, with longer options available for legal-size or oversized work, so check your actual binding edge length rather than assuming a standard length will stretch to fit. If your machine's punch itself is the limiting factor on document size, it's worth reviewing options in coil binding machines to confirm your punch length matches the documents you're binding, not just the coil.