鍛冶屋 · KAJIYA
Seki, JP

A·TELIER

刀 · KATANA
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N° 001 — 七本 / SEVEN
— A study in steel, wood & fire
HAND-FORGED IN
SEKI CITY · 関市
FIG. 01 — The Block
05 — Commission

A blade,
made for one hand.

Choose a steel core, a cladding, a handle wood, a pin material. Eighteen-month wait. Six hundred grams of correspondence. One knife.

STEEL CORE
Aogami #1
Blue Paper · 64 HRC
Shirogami #2
White Paper · 62 HRC
SG2 Powder
Stainless · 63 HRC
PIN MATERIAL
Mosaic Brass
Nickel Silver
Copper Pin
YOUR BLADE
N°  UNIQUE
CORE
Aogami #1
CLAD
Damascus 42
WOOD
Walnut Burl
PIN
Mosaic Brass
CLADDING
Damascus 42
Suminagashi pattern
Kurouchi
Black forge finish
Kasumi
Soft iron mist
HANDLE WOOD
Walnut Burl
Bog Oak · 4000 yr
Japanese Ho
02 — The Collection

Seven profiles, each
with a single purpose.

N° 01 / 07
牛刀
GYUTO
牛刀 — The Chef

The all-purpose hand of the kitchen. Long, slender, with a gentle belly for rocking and a fine tip for precision tasks. Forged in 42 layers of damascus over a SG2 powder-steel core.

Steel core
SG2 · powder · 1.4% C
Cladding
VG-10 damascus, 42 layers
Hardness
63 HRC ±0.5
Handle
Japanese oak · buffalo horn
Edge length
240 mm
Weight
198 g
240 mm HEEL TIP
FORGING · 1080°C
● LIVE FROM SEKI
HAMMER · 38 STROKES
三徳
N° 02 / 07
SANTOKU
三徳 — Three Virtues

Meat, fish, vegetable — the three virtues. A shorter, lighter blade with a sheepsfoot tip, ideal for the small Japanese kitchen and confident downward cuts.

Steel core
Aogami #2 · blue paper
Cladding
Soft iron · kasumi
Hardness
62 HRC
Handle
Magnolia · ebony ferrule
Edge length
175 mm
Weight
156 g
175 mm
N° 03 / 07
菜切
NAKIRI
菜切 — Leaf Cutter

A rectangular vegetable cleaver. Flat edge for full-contact slicing — push through a daikon in a single motion. Thin behind the edge for surgical clean cuts.

Steel core
Shirogami #1 · white paper
Cladding
Iron · kurouchi finish
Hardness
64 HRC
Handle
Walnut burl · brass mosaic
Edge length
165 mm
Weight
182 g
165 mm
筋引
N° 04 / 07
SUJIHIKI
筋引 — Slicer

A long, narrow blade for slicing fish, brisket, or roast in single confident strokes. Minimal friction — the cut is the surface.

Steel core
R2 · powder steel
Cladding
Stainless · mirror polish
Hardness
63 HRC
Handle
Rosewood · nickel-silver
Edge length
270 mm
Weight
172 g
N° 05 / 07
ペティ
PETTY
ペティ — Utility

The everyday small knife. Trim shallots, segment citrus, butterfly shrimp. Lives next to the cutting board and earns its keep daily.

Steel core
VG-10 · stainless
Cladding
Damascus · 33 layers
Hardness
61 HRC
Handle
Pakka · stabilised
Edge length
135 mm
Weight
88 g
骨スキ
N° 06 / 07
HONESUKI
骨スキ — Boning

A triangular, rigid blade engineered for poultry — pierces joints, separates tendon, lifts breast from bone with a single articulated motion.

Steel core
Ginsan · semi-stainless
Cladding
— monosteel
Hardness
62 HRC
Handle
Ho-wood · horn collar
Edge length
150 mm
Weight
142 g
N° 07 / 07
— FIN
PARING
小刀 — Paring

The smallest in the block. A blade that lives between thumb and finger. For tournée potatoes, strawberry hulls, the last quiet ten seconds before service.

Steel core
SG2 · powder
Cladding
Stainless · 11 layers
Hardness
63 HRC
Handle
Black walnut · pinned
Edge length
85 mm
Weight
52 g
03 — The Forge

A hammer falls
at four in the morning.

PL. 01 — Sparks
FIELD NOTE · 04:12

"The steel does not yet know what it will become. We strike it twenty-seven times before it begins to listen."

— 序 —

Kenji Tanaka is the fourth-generation master of a small forge tucked between two rivers in Seki city.

His grandfather's grandfather forged swords here. His grandfather forged bayonets, then refused. His father forged the first kitchen knife under this roof in 1947 — out of a wartime helmet and a piece of railway track.

Today Kenji forges seven shapes and seven shapes only. "More than seven," he says, "and you begin to lie."

"Raw steel is lifeless. It is the falling of the hammer, eighty-three thousand times across two days, that gives a blade its soul."

— Kenji Tanaka, fourth master of the Kajiya forge

Each blade leaves the forge with a single mark stamped into its tang: a small kanji, slightly off-centre, indicating which of the four sons of the house drew it from the fire. There are no serial numbers. The forge has never made the same knife twice.

CONTINUED ↓
PL. 02 — Kenji-san
PROCESS · STEP 04 OF 11
Folding the bar
42 folds yields 4,398,046,511,104 layers of differentiated carbon.
THE ELEVEN STEPS
選鋼
select
加熱
heat
鍛接
weld
折返
fold
延伸
draw
整形
shape
焼入
quench
焼戻
temper
研削
grind
研磨
polish
柄付
handle
04A — Sharpen
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研ぎ

The stone
remembers.

A blade is honed in three water-stones — coarse, medium, fine — at a constant fifteen degrees. Twenty strokes per side. Listen for the whisper, not the scrape.

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FILM · 02:14
15° · WATER
#1000
medium grit
15°
edge angle
20×
strokes / side
04B — Store
保管

Wood, leather,
or magnet.

Never the drawer. A blade kept loose against its siblings will dull within a week. We offer three sanctuaries — each treated, each numbered, each guaranteed for life.

PL. 03 — Leather Roll, hand-stitched
7
slot roll
N52
magnet block
lifetime resharpening

Seven blades. One hundred and one years.
Each knife begins as a black bar of tamahagane — and ends, after thirty-seven hands and forty-two folds, as an object asked to live in your kitchen for the next century.

101
years of forging
42
folds per blade
63+
HRC hardness
7
profiles, no more