Scientific Anglers Frequency Intermediate
Scientific Anglers Frequency Intermediate is a slow-sinking, clear line designed for stillwaters, dams, and calm river pools where subtle depth control is essential. The 1.25 ips sink rate allows flies to settle slowly into the feeding zone, while the balanced taper loads easily and suits a wide range of rod actions. Ideal for nymphs and streamers in both moderate and cold climates.
Technologies
- AST – Slickness additive that reduces friction, improves shootability, and maintains clean performance.
- Welded Loops – Durable welded front loop for quick, reliable leader changes.
- Single-Strand Monofilament Core – Low-stretch core ideal for intermediate and sinking lines requiring sensitivity.
Temperature Rating
- Cold / Moderate – 0°C to 25°C
Target Species
- Trout
- Yellowfish
- Barbel
- Bass
- Carp
Types of Flies
- Nymphs
- Streamers
Additional Features
- Slow 1.25 ips sink rate for controlled presentations in stillwaters.
- Ideal for fishing mid-depths and suspending patterns just below the surface film.
- Easy-loading taper suitable for a wide range of rod actions.
Line Chart
| Line Weight | Head Length | Total Length | Grain Weight* |
|---|---|---|---|
| WF-5-S | 10.4 | 25.9 | 140 gr / 9.1 g |
| WF-6-S | 11.0 | 25.9 | 160 gr / 10.4 g |
| WF-7-S | 11.0 | 25.9 | 185 gr / 12.0 g |
| WF-8-S | 11.6 | 25.9 | 210 gr / 13.6 g |
*Grain weight measured at first 9.1 m.
Product Information
Product Information
Shipping & Returns
Shipping & Returns


Scientific Anglers Frequency Intermediate
Scientific Anglers Frequency Intermediate
Scientific Anglers Frequency Intermediate is a slow-sinking, clear line designed for stillwaters, dams, and calm river pools where subtle depth control is essential. The 1.25 ips sink rate allows flies to settle slowly into the feeding zone, while the balanced taper loads easily and suits a wide range of rod actions. Ideal for nymphs and streamers in both moderate and cold climates.
Technologies
- AST – Slickness additive that reduces friction, improves shootability, and maintains clean performance.
- Welded Loops – Durable welded front loop for quick, reliable leader changes.
- Single-Strand Monofilament Core – Low-stretch core ideal for intermediate and sinking lines requiring sensitivity.
Temperature Rating
- Cold / Moderate – 0°C to 25°C
Target Species
- Trout
- Yellowfish
- Barbel
- Bass
- Carp
Types of Flies
- Nymphs
- Streamers
Additional Features
- Slow 1.25 ips sink rate for controlled presentations in stillwaters.
- Ideal for fishing mid-depths and suspending patterns just below the surface film.
- Easy-loading taper suitable for a wide range of rod actions.
Line Chart
| Line Weight | Head Length | Total Length | Grain Weight* |
|---|---|---|---|
| WF-5-S | 10.4 | 25.9 | 140 gr / 9.1 g |
| WF-6-S | 11.0 | 25.9 | 160 gr / 10.4 g |
| WF-7-S | 11.0 | 25.9 | 185 gr / 12.0 g |
| WF-8-S | 11.6 | 25.9 | 210 gr / 13.6 g |
*Grain weight measured at first 9.1 m.
Original: $72.75
-70%$72.75
$21.82Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Scientific Anglers Frequency Intermediate is a slow-sinking, clear line designed for stillwaters, dams, and calm river pools where subtle depth control is essential. The 1.25 ips sink rate allows flies to settle slowly into the feeding zone, while the balanced taper loads easily and suits a wide range of rod actions. Ideal for nymphs and streamers in both moderate and cold climates.
Technologies
- AST – Slickness additive that reduces friction, improves shootability, and maintains clean performance.
- Welded Loops – Durable welded front loop for quick, reliable leader changes.
- Single-Strand Monofilament Core – Low-stretch core ideal for intermediate and sinking lines requiring sensitivity.
Temperature Rating
- Cold / Moderate – 0°C to 25°C
Target Species
- Trout
- Yellowfish
- Barbel
- Bass
- Carp
Types of Flies
- Nymphs
- Streamers
Additional Features
- Slow 1.25 ips sink rate for controlled presentations in stillwaters.
- Ideal for fishing mid-depths and suspending patterns just below the surface film.
- Easy-loading taper suitable for a wide range of rod actions.
Line Chart
| Line Weight | Head Length | Total Length | Grain Weight* |
|---|---|---|---|
| WF-5-S | 10.4 | 25.9 | 140 gr / 9.1 g |
| WF-6-S | 11.0 | 25.9 | 160 gr / 10.4 g |
| WF-7-S | 11.0 | 25.9 | 185 gr / 12.0 g |
| WF-8-S | 11.6 | 25.9 | 210 gr / 13.6 g |
*Grain weight measured at first 9.1 m.



















