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The FN Big 1000 Butchering & Taiwan Tuna Knife is hand forged by Master Kuo from spring steel and has a RC hardness of 60-61. It is a supersized G-4 and fits between the G-5 3XL and the larger FN Big 1400 knives. On larger fish like Tuna, Mahi, Grouper, etc., this knife is used to zip through long lateral, sectioning cuts. The 1000 can also cut through the fish’s spine when cutting steaks. It can also be used for cutting pork and beef.

The FN Big series is a collaboration between Jende and Master Kuo to make some seriously large Taiwan Tuna Knives. The black scale from the forge forms a natural protective coating that keeps the blade from rusting. It gives them a more rugged, rustic, and all around more manly look, too.


  •  Blade Length: 290 x 190 x 5 mm / 11.4″ x 7.5″ x 0.20″
  • Handle Length: 100 mm x 4″
  • Overall Length: 365mm / 14.5″
  • Weight: 1400 g. / 50 oz. (1.4 kg / 3.1 lbs .)

Knife care: Keep clean with warm water and soap. Towel dry immediately. Do not put into dishwasher. The edge steel can show signs of surface rust over time. Most surface rust can be removed by sharpening the edge or using a scotchbrite pad.

Master Kuo knives are some of the sharpest factory sharp knives we’ve ever seen, but they are capable of even more after our professional sharpening services. We recommend the 2000 and 5000 Grit services for this knife. You can also add a custom made leather sheath.


Weight 3.5 lbs
Dimensions 16 × 12 × 3 in

Master Kuo


Master Kuo FN Big series

2 reviews for Master Kuo FN Big 1400 Taiwan Tuna Knife, Big Fish Knife

  1. ferb

    The quality of sharpness is what one gets from Taiwan knives. One should be comfortable with extremely sharp knives to use this one.

  2. Edward

    U will not regret ,very sharp loved it♥️♥️

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Shipping to USA

Most Domestic USA orders ship within 72 hours of ordering from our Colorado location via USPS. You can track your order from this Link

Shipping International/ outside of USA

Most International orders ship within 72 hours of ordering from our Taiwan location via Chunghwa Post. You can track your order from your countrys postal website or from this Link

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