Kanjo Tsukahara HAP40 Petty 150mm, Octagonal Handle

Kanjo Tsukahara HAP40 Petty 150mm, Octagonal Handle

This petty knife comes from Kanjo Tsukahara, a young blacksmith based in Seki City, Japan, a region with 700 years of knife-making heritage. Kanjo comes from a family of master sharpeners and has built a reputation for working with advanced steels like HAP40 and ZDP-189, materials only a handful of Japanese makers handle with confidence. The blade is forged from Hitachi's HAP40, a powder high-speed steel known for exceptional hardness and outstanding edge retention, ground into a hamaguri-ba, or clam shell, convex profile that cuts smoothly while staying strong against chipping. At 150mm, this petty knife is the ideal size for fine dicing, mincing, peeling, and other small or off-board tasks where a full-size chef's knife is too much. It comes fitted with a gray octagonal handle made from reinforced laminated wood, giving it a comfortable, secure grip with a clean, modern look.

Specifications
Blacksmith: Kanjo Tsukahara
Origin: Seki City, Japan
Knife type: Petty / utility knife, double bevel
Blade steel: HAP40, powder high-speed semi-stainless steel
Hardness: approximately 65 HRC Blade construction: Hamaguri-ba (convex grind)
Blade length: approximately 150mm (5.9")
Total length: approximately 272mm (10.7")
Weight: approximately 77g
Handle: octagonal

Care notes
HAP40 is semi-stainless and may develop a light patina over time, which is normal and does not affect performance. Hand wash and dry the blade immediately after use, and avoid leaving it wet. Not dishwasher safe. Avoid cutting frozen food or bone, and avoid twisting the blade, as the edge is ground thin for sharpness. Use a sharpening stone to maintain the edge.