Yu Kurosaki Kokusen AS Petty 150mm with Rosewood Octogon Wa Handle

Overview

The Yu Kurosaki Kokusen AS Petty 150mm with Rosewood Octagon Wa Handle is a nimble, high-performance Japanese utility knife made for cooks who want precision, edge retention, and standout forged character in a practical everyday size. At 150mm, this petty gives you more reach than a smaller paring-style utility knife while still feeling controlled for detail work, trimming, slicing fruit, preparing herbs, breaking down smaller proteins, and handling quick board tasks where a gyuto may feel too large.

The Kokusen line pairs Aogami Super carbon steel with stainless cladding, giving the knife excellent edge life while reducing some of the maintenance required compared with fully reactive carbon steel blades. Yu Kurosaki’s hammered Kokusen finish gives the blade a bold, dark, textured look while helping with food release during prep. The rosewood octagon wa handle keeps the knife light, balanced, and comfortable for both pinch grip and handle-focused cutting styles.

This is a strong choice for anyone looking for a premium Japanese petty knife that can work as a small prep knife, line knife, or everyday utility blade. Because the exposed Aogami Super edge is reactive, wipe the knife dry during use, avoid soaking it, and never put it in the dishwasher. A natural patina may form over time. For storage or humid environments, a thin coat of Tsubaki oil can help protect the carbon steel edge.

Common Questions

Q: What is a 150mm petty knife best used for?

A: A 150mm petty knife is excellent for small-to-medium prep jobs such as slicing shallots, trimming proteins, cutting citrus, preparing garnishes, mincing garlic, and working with herbs. It is longer than a paring knife but easier to control than a full-size chef knife.

Q: Is the Yu Kurosaki Kokusen AS Petty good for home cooks?

A: Yes. This knife is a great fit for home cooks who want a premium utility knife with excellent sharpness and edge retention. It is especially useful if you cook often and want one small knife that can handle a wide range of everyday prep tasks.

Q: How should I maintain the edge on this petty knife?

A: Use a knife-friendly cutting board, wipe the blade dry after use, and avoid hard materials like bone, frozen food, and glass boards. Regular stropping on the Tokushu Knife Premium XL Buffalo Strop can help keep the edge crisp between sharpenings. For the best cutting surface, pair it with a Hasegawa Pro Cutting Board.

Specifications

• Brand/Blacksmith: Yu Kurosaki
• Knife Type: Petty / Utility Knife
• Core Steel: Aogami Super / Blue Super carbon steel
• Cladding Type: Stainless cladding with hammered Kokusen finish
• Blade Length: 53mm
• Overall Length: 280mm
• Blade Height at Heel: 33.3mm
• Spine Thickness (Heel): 1.9mm
• Weight: 78g
• Handle Material: Octagonal rosewood wa handle with black pakkawood ferrule
• Hardness (HRC): 65
• Bevel: Double bevel / 50/50 edge
• Origin: Echizen, Fukui, Japan
• Care: Carbon steel edge; hand wash and dry immediately