Rockstead SAI-ZDP (BL) Premium DLC Titanium Folding Knife

Handcrafted in Sakai, Japan, the Rockstead SAI-ZDP is an absolute masterpiece of luxury everyday carry (EDC knife). Designed for elite collectors, this premium folding knife features a Clad ZDP-189 powder stainless steel blade, hardened to an incredible 66.7 HRc for unmatched edge retention.

Unlike ordinary knives, the SAI showcases Rockstead’s legendary Honmizukuri (convex) geometry, meticulously hand-polished to a flawless mirror finish that eliminates cutting resistance. The ergonomic handle is precision-machined from solid titanium and finished with a striking, scratch-resistant DLC (Diamond-Like Carbon) coating. The Rockstead SAI is not just an investment; it is a functional work of art built to endure for generations.

Key Features

• Legendary Honmizukuri Convex Edge

Features a hand-polished, mirror-finished convex blade that delivers the ultimate cutting performance and a razor edge that lasts for years.

• Ultra-Hard ZDP-189 Steel

The core is forged from premium ZDP-189 powder steel (~66.7 HRc), providing the world's highest level of wear resistance.

• DLC-Coated Titanium Handle

The solid titanium handle features an ergonomic grip treated with a high-durability DLC coating, balancing luxury aesthetics with tactical toughness.

• Serialized Masterpiece

Proudly made in Sakai, Japan. Each knife comes with a unique serial number, granting the owner access to Rockstead's official maintenance and sharpening program.

Why the Rockstead SAI belongs in your collection:

• Honzukuri Convex Grind: The signature continuously varying blade angle maximizes both heavy slicing power and hair-splitting precision.

• Effortless Deployment: Dual thumb studs combined with perfectly tuned, micro-smooth washers ensure incredibly fluid, one-handed deployment.

• Lifetime Factory Backing: Each knife is individually serialized and eligible for Rockstead's world-class professional restoration and sharpening program in Japan.

ZDP189 Blade Introduction

ZDP-189 is a high-carbon, high-chromium powder metallurgy steel renowned for its extreme hardness, often exceeding 64 HRC, which delivers peerless edge retention and aggressive cutting performance. This performance comes at a cost; its massive carbide volume makes the steel notoriously difficult to sharpen and increases brittleness, posing a risk of chipping under heavy lateral impact. Furthermore, while technically stainless, its high carbon content necessitates diligent maintenance to prevent oxidation, making it a specialized choice for precision cutting tasks rather than rough, heavy-duty utility.

SAI-ZDP (BL) Related FAQ