HYS-MAX67 (Hayashi Ultimate PM)

Reference sectionHYS-MAX67

Quick look

• Hardness window: 67 HRC—industry first (業界初) for professional styling scissors.
• Toughness: Two-piece welded construction bonds a tough base to an HRC 67 blade edge, solving the brittleness problem that has historically made ultra-hard steels impractical for scissors.
• Corrosion profile: Stainless-grade matrix maintains salon-level corrosion resistance despite the extreme hardness.
• Weight/feel: Welded construction allows optimized weight distribution—tough spine, hard edge, balanced hand.

DetailEngineering breakthrough — two-piece welding

HYS-MAX67 represents years of R&D by Hayashi Scissors to solve a fundamental metallurgical problem: steel at HRC 67 is extremely hard but also extremely brittle. A full-tang blade at this hardness would shatter on impact. Hayashi’s solution was two-piece welding (二枚構造溶接)—a tough, resilient base is precision-welded to an HRC 67 cutting blade. The base absorbs shock and provides structural integrity while the HRC 67 blade forms the cutting edge. This welded approach is not a compromise; it is a deliberate engineering decision that allows each section of the scissor to be optimized independently for its specific function.

Why it matters

At HRC 67, HYS-MAX67 reaches a hardness level that no single-piece scissor steel can safely achieve. Hayashi describes the cutting experience as 全てを超えるなめらかさ—”smoothness that surpasses everything.” Hayashi frames the aspiration directly: “Scissors must be sharpened regularly. So, maintenance-free would be dream scissors.” HYS-MAX67 is their closest approach to that dream. The achievement was recognized with a プレミア和歌山 (Premier Wakayama) award.

Pairing contextShear pairing & edge compatibility

• Hayashi flagship convex shears: HYS-MAX67 is reserved for Hayashi’s top-tier models.
• Specialist dry-cutting tools: The extreme hardness is most meaningful in dry precision work where edge degradation is most perceptible.

Process routeTechnique map

• Ultra-precision dry cutting and editorial work where any edge degradation affects the quality of the finished shape.
• Low-to-moderate volume studios where the time between sharpenings is valued more than raw speed.
• Platform and competition work where maintaining factory-level sharpness through a full show day is critical.

Claims to evaluateReal-world stress tests

• Edge retention: Hayashi says its HYS scissors need maintenance “incomparably” less often than standard scissors. It publishes no cut count or interval.
• Impact/drop resilience: The welded construction mitigates but does not eliminate brittleness risk at the edge. Tip damage from drops onto hard surfaces remains possible and would require specialist repair. The tough base prevents catastrophic blade failure.
• Weight & in-hand feel: The two-piece construction allows tuned balance—Hayashi can control weight distribution in ways that monolithic blades cannot.

Care and serviceMaintenance notes

When sharpening is eventually required, this is strictly specialist territory. HRC 67 powder metal demands diamond or CBN abrasives and a technician who understands the welded construction. Do not allow a standard sharpener to service these scissors—improper technique could damage the weld zone or overheat the blade. Routine maintenance is standard: wipe after every client, dry thoroughly, oil the pivot as the maker directs.

ContextIndustry snapshot

• Hayashi Scissors (林シザース): HYS-MAX67 is Hayashi’s flagship material, exclusive to their premium lines and manufactured entirely in-house in Japan.

DetailHow it compares

Trade-offs

• Among the most expensive scissor steels in production—materials, R&D, and manufacturing complexity all contribute.
• Extremely limited sharpening options; plan maintenance well in advance and budget for specialist service.
• The two-piece welded construction, while ingenious, introduces a weld zone that requires quality control beyond what single-piece blanks demand.
• Overkill for high-volume wet cutting, where extreme hardness matters less.

  DetailManufacturer data (Hayashi Scissors, Wakayama)

Hayashi documents two HYS variants:

The powder metallurgy (粉末冶金) process eliminates the uneven distribution problems of conventional cast alloys — raw materials are reduced to microscopic particles, mixed uniformly, then sintered under heat and pressure.

Source: Hayashi Scissors — Materials (Japanese)

Related: HYS • SG Powder High Metal • Scissor Maintenance

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