Scientific Anglers Sonar Leader – Intermediate
Imagine a world where you need to get a fly down to the fish, but all you have is a floating fly line. In that world, the perfect solution would be our SONAR Sinking Leaders. Luckily for you, we live in such a world. These 10′ leaders attach to the end of a fly line and can put your fly anywhere in the water column. With five different densities, each weighing in at 50 grains, you’ll be able to cover the surface to the depths. Ideal for single-handed lines as well as light double-handed lines, no matter the scenario, you can Get Down with SONAR.
Key Features:
- 7′ & 10′ floating and sinking leaders for use with double- and single-handed lines
- Built on 25-lb. monofilament
- Weight: 35 & 50 grains
- Welded loop on butt end
- SA ID for quick identification of individual leaders
| Feature | Detail |
|---|---|
| Length | 7′, 10′ |
| Material | 25-lb. monofilament |
| Weight | 35 grains, 50 grains |
| End Type | Welded loop |
| Identification | SA ID marking |
FAQ
What is the difference between the 35-grain and 50-grain versions?
The 35-grain version is lighter and sinks more slowly, ideal for surface or mid-water presentations. The 50-grain version sinks faster and reaches deeper water, suitable for deeper fishing scenarios.
Can this leader be used with both single-handed and double-handed fly lines?
Yes, the SONAR Sinking Leaders are designed to work with both single-handed and light double-handed fly lines.
Is the leader durable under regular use?
Yes, built on 25-lb. monofilament, it is designed to withstand regular fishing conditions and maintain strength over time.


Nicola Berry –
This leader works great for getting flies down to deeper spots. The 50-grain version sinks quickly and stays stable. Easy to attach and identify with the SA ID mark. Used it on a single-handed line in a river and caught several trout.
Rose Hunter –
Felt like a solid addition to my fly fishing gear. The welded loop makes tying on easy. Sinks well and doesn’t tangle. A bit heavier than expected, but effective for deeper water fishing.
Joanne Lee –
Perfect for when I need to reach the bottom without using a sinking tip. The 35-grain version works well for surface feeding fish. Lightweight and reliable. Would recommend to any beginner or intermediate angler.