Zwilling Four Star 5.5-inch Flexible Boning Knife

A worldwide best-seller, the Zwilling Four Star 5.5-inch Flexible Boning Knife is a model of safety, comfort, and precision. Developed in collaboration with professional chefs, its design is focused on providing exceptional performance for deboning fish, poultry, and meat. The long, thin blade is engineered for meticulous trimming, allowing you to separate meat from bone and skin with clean, precise cuts. Its flexibility is key to its performance, enabling the knife to bend and glide effortlessly along contours to minimize waste.


The knife is precision-forged from a single piece of Zwilling's special formula high-carbon stainless steel using the proprietary SIGMAFORGE process. This method ensures a perfectly balanced, sturdy, and flexible blade. The blade then undergoes Zwilling's signature FRIODUR ice-hardening process, which enhances the steel's molecular structure. This results in a blade with exceptional durability, high corrosion resistance, and superior, long-lasting sharpness.


The Four Star line is celebrated for its seamless, ergonomic handle, which provides a comfortable and secure grip for extended use. Molded from high-impact polypropylene, the handle is permanently bonded to the blade, eliminating gaps for improved hygiene and durability. A substantial bolster provides excellent balance while acting as a finger guard for added safety. Made in Solingen, Germany, this knife combines nearly three centuries of craftsmanship with modern technology to deliver a tool of unparalleled quality.

SKU: 1001601

Availability: In stock

$109.95
  • Details

    • Blade Length: 5.5 inches / 140mm
    • Blade Steel: Special formula high-carbon stainless steel
    • Hardness: 57 Rockwell Hardness
    • Manufacturing Method: SIGMAFORGE, precision-forged from a single piece
    • Hardening Process: FRIODUR ice-hardened blade for durability and corrosion resistance
    • Edge: Hand-sharpened and polished with a laser-controlled 15° angle per side
    • Handle: Ergonomic, seamless polypropylene
    • Construction: Full tang with safety bolster
    • Origin: Made in Germany
    • Warranty: ZWILLING Lifetime Warranty

    Additional Info

    Blade Length (Inches) 5.5 in.
    Blade Length (mm) No
    Blade Width (inches) 0.5
    Grind 50/50 Bevel
    Steel Type X50CrMoV15
    Rockwell Hardness 57
    Stainless Yes
    Handle Material Ergonomic Non-Slip Polypropylene
    Spine Thickness (mm) 1.7
    Brand Zwilling J.A. Henckels
    Country of Manufacture Germany
    SKU 1001601
    Manufacturer's Part Number 31086-143
    Manufacturer's Suggested Retail Price $137.00

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