Victorinox Fibrox Boning Knife Straight Blade 6 in (5.6413.15)
By Victorinox · Kitchen Knives · Kitchen & Cooking · More from Victorinox
- Extra-narrow flexible blade, length 5.9 in, straight edge, stamped
- Overall length 11.3 in, weight 3 oz
- TPE non-slip handle
- Dishwasher safe, made in Switzerland, lifetime warranty
Lowest price seen
$39.99
from $39.99 at Cutlery and More · Checked Oct 16, 2026
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Summary
A straight, extra-narrow 6 in flexible boning knife with a black TPE Fibrox handle, made for trimming and deboning poultry and fish. Check your cutting tasks before you buy: the flexible blade bows on tough beef and pork connective tissue.
Strengths
- Narrow flexible blade follows bones and joints closely on poultry and fish with little waste.
- Textured Fibrox handle stays grippy when wet or slippery with fat, owners report.
- America’s Test Kitchen named this exact model a Co-Best Buy after industrial sharpness testing and multi-tester butchery trials.
- Reviewed placed it in its top test group and praised the lightweight textured grip.
- Owners report long intervals between sharpening and easy resharpening, including one professional meat cutter citing 20 years without sharpening.
- Stamped construction with NSF certification and a sanitizable handle suits commercial kitchen use.
Weaknesses
- America’s Test Kitchen and Reviewed both found its edge less sharp than the top knives in their test groups.
- The flexible straight blade bows against tough beef and pork connective tissue and is the wrong match for stiff red-meat trimming.
- Several America’s Test Kitchen testers found the thicker handle unwieldy for changing grips, though large-handed testers preferred it.
- One exact-model buyer reported the blade did not pass a paper-cutting test out of the box and needed honing.
- No sheath or blade guard is included.
- The model number stamped on the blade can differ from the box and listing, so size, shape and handle color are the reliable match.
Verified specifications
| Item number | 5.6413.15. |
|---|---|
| Blade | 5.9 in, straight edge, extra narrow, flexible, stamped high-carbon stainless steel. |
| Overall length | 11.3 in. |
| Height | 0.9 in; width: 1.5 in. |
| Weight | 3 oz. |
| Handle | black thermoplastic elastomers (TPE) Fibrox handle. |
| Handle measurements by America’s Test Kitchen: 4.5 in handle length, 3.5 in handle circumference. | |
| Measured weight by America’s Test Kitchen: 3.2 oz. | |
| Measured edge angle by America’s Test Kitchen: 15°. | |
| Measured spine thickness by America’s Test Kitchen: 1.27 mm. | |
| Country of origin | Switzerland. |
| Certified | NSF Certified. |
| Dishwasher safe | yes. |
| Warranty | Victorinox lifetime warranty. |
| Legacy identifiers for the same knife | Forschner 40513 and 47513. |
Full research notes and sources
Sources
- Victorinox — Fibrox Boning Knife Straight Blade product page
- Victorinox — Lifetime warranty page
- Victorinox — Curved Fibrox Boning Knife product page
- WebstaurantStore — Flexible narrow boning knife listing
- KnifeCenter — Flexible boning knife listing
- Reviewed — Boning knives and fillet knives test
- Serious Eats — Boning knives guide
- CookingFlavour — Fibrox narrow boning knife review
- r/chefknives — Fibrox appreciation thread
- r/chefknives — Curved boning knife thread
- Victorinox Australia — Straight narrow flexible boning knife page
- Swiss-Knife — Safety Grip boning knife page
