Scientific 135474 Fluorocarbon Line
- Fluorocarbon Line
- 5 lb
- 98.4 feet
- Fluorocarbon
A standard 5X fluorocarbon tippet spool sized for fly anglers building lighter leaders in clear water conditions.
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How it ranks among the 55 fluorocarbon lines we track
4.6★ across 432 Amazon ratings, Bayesian-smoothed toward the category average.
432 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
300+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 55 fluorocarbon lines we track - how the scorecard works · full fluorocarbon lines data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A 5X fluorocarbon tippet spool from Scientific measuring roughly 98 feet, sold clear for fly leader and tippet building.
The 13 inch length field appears to describe packaging rather than the line itself; the pieces field of 98.42 feet is the figure that matches a standard tippet spool size. 5X sizing places this in the lighter tippet range used for smaller flies and more leader-shy fish, and fluorocarbon material gives it lower underwater visibility and less stretch than nylon monofilament.
- 5X fluorocarbon tippet
- Approximately 98.42 feet per spool
- Clear color
- Scientific 135474
Who it's for
Fly anglers who tie their own leaders and tippets and need a 5X diameter in fluorocarbon for clearer water or leader-shy fish. Not the choice for anglers needing heavier tippet sizes or wanting nylon's extra stretch for shock absorption.
Strengths and trade-offs
Drawn from this product's published specifications.
- 5X diameter suited to smaller flies and clear water
- Fluorocarbon sinks and resists water absorption
- Roughly 98 feet per spool for repeated leader building
- Lower stretch than nylon means less shock absorption on strikes
- 5X is a lighter tippet size, not suited to larger or harder-fighting fish
Performance notes
Fluorocarbon has a refractive index closer to water than nylon, so it is less visible underwater at the same diameter, and it sinks rather than floats, which helps get subsurface flies down without added weight. The tradeoff is that fluorocarbon has less stretch than nylon, so tippet knots need to be tied carefully to avoid weak points.
Specifications
| Brand | Scientific |
|---|---|
| Model | 135474 |
| Line Weight | 5 lb |
| Pieces | 98.4 feet |
| Material | Fluorocarbon |
| Color | Clear |
How it compares
This product against the closest alternatives we track in fluorocarbon lines.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Scientific 135474 Fluorocarbon LineThis product | 4.6 / 5 | 432 | 4.2 / 5 |
| Seaguar 20FC25 Fluorocarbon LineSeaguar | 4.7 / 5 | 8,500 | 4.5 / 5 |
| Berkley VPS8-15 Fluorocarbon LineBerkley | 4.6 / 5 | 6,718 | 4.4 / 5 |
| Yo-Zuri HD 30LB DP Fluorocarbon LineYO-Zuri | 4.7 / 5 | 1,100 | 4.2 / 5 |
| KastKing FBA_KK-FK Fluorocarbon LineKastKing | 4.5 / 5 | 7,500 | 4.2 / 5 |
Similar fluorocarbon lines from other brands
Questions about the Scientific 135474
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What tippet size is the Scientific 135474 line?
It is sized 5X, a lighter diameter used for smaller flies and more leader-shy fishing conditions.
How much line is on the Scientific 135474 spool?
The listing states 98.42 feet per spool.
Is the Scientific 135474 fluorocarbon or nylon?
It is fluorocarbon, which sinks and is less visible underwater than nylon monofilament of the same diameter.