Description
Two common systems used to measure thread thickness are the Aught and Denier systems. Understanding these systems is key to choosing the right thread for your fly tying projects.
The Aught System
The Aught system, denoted as “/0” (e.g., 6/0, 8/0), is a traditional method used primarily in fly tying. In this system, the higher the number before “/0”, the thinner the thread. For example, 6/0 is thicker than 8/0. However, it’s important to note that the Aught system is not standardized. The thickness for a given aught size can vary between manufacturers. This system is more about relative thickness and is deeply rooted in the tradition of fly tying.
The Denier System
On the other hand, the Denier system offers a more scientific approach. Denier measures the linear mass density of fibers and is defined as the mass in grams of 9,000 meters of thread. A higher denier means a thicker thread. This system is widely used in the textile industry and provides a consistent and quantitative measure of thread thickness. For instance, a 70-denier thread is thinner than a 210-denier thread.
Understanding the Aught and Denier systems is essential for fly tiers of all levels. While the Aught system remains popular due to its historical use in fly tying, the Denier system provides a more precise measurement. By familiarizing themselves with both systems, fly tiers
Chart below provides Aught and Denier specifications for HENDS Nano thread.
| Nano Thread – HENDS | ||
| Aught | Denier | Approx Breaking Strain Grams |
| 22 | 20 D | 750 grams |
| 18 | 30 D | 1140 grams |
| 16 | 40 D | 1550 grams |
| 12 | 50 D | 1900 grams |
| 8 | 75 D | 3250 grams |
| 2 | 100 D | 3800 grams |
