Crimps & End Caps: How to Choose Sizes for Cords & Wires
Why Crimps & End Caps Matter
When finishing jewellery, a secure and neat ending makes all the difference. Crimps and end caps are essential for attaching clasps, securing beads, or neatly finishing corded designs. But using the wrong size can lead to slipping, fraying, or bulky ends.
The key rule? Match the internal diameter (ID) of the crimp or end cap to the cord diameter plus 0.1–0.2 mm clearance.
Sizing Table for Crimps & End Caps
Here’s a quick reference guide to help you match the right findings with your cord or wire type:
| Cord Type | Typical Diameter (Ø) | Recommended Crimp / End-Cap ID |
|---|---|---|
| Tigertail / beading wire | 0.38–0.46 mm | 1.0 mm crimp tube or bead |
| Nylon-coated wire (heavy) | 0.5–0.6 mm | 1.3–1.5 mm |
| Elastic (0.5–0.8 mm) | 0.5–0.8 mm | 1.2–1.5 mm (use glue assist) |
| Leather/cotton cord 1 mm | 1.0 mm | 1.2–1.5 mm end cap |
| Leather cord 2 mm | 2.0 mm | 2.2–2.5 mm end cap or fold-over |
Pro Tips
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For heavy duty projects: Choose crimp tubes (longer) instead of crimp beads, then add a crimp cover for a polished look.
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Elastic cords: Always add a dab of glue inside the crimp or end cap for extra hold.
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Fold-over ends: Great for thicker cords like 2 mm leather—just flatten with pliers for a secure grip.
Frequently Asked Questions
Tube or bead crimps?
Crimp tubes provide more surface area, making them stronger and better for heavy-duty projects. Crimp beads are smaller and neater, ideal for lightweight or delicate designs.
Do I need glue?
For elastic and end caps, yes—glue helps improve security and reduce slipping. For beading wire and tigertail, it’s best to rely on proper crimping with crimping pliers rather than glue.
Final Thoughts
The right crimp or end cap size ensures your jewellery designs are both secure and professional-looking. Use the sizing table above as your go-to guide, and don’t forget to finish neatly with crimp covers or fold-over ends when needed.