Japanese Wood Chisel Set Yasuki White Steel No.2 Triple-Hollow Back A-4
VAT, import taxes, customs duties, tariffs, and related fees are NOT included in our prices. The shipping company charges you these fees, after shipment.
Manufacturer's lead time is usually 1-4 weeks.
Acual handle color is different from the photo, depending on handle materials.
SUMMARY
Miki craftsmanship. White Steel sharpness. A back designed to guide the cut.
Bring Japanese blade-making expertise to your workbench with the Koyama A-4 Nomikatsu chisel set. Made by Koyama Hardware Co., Ltd. in Miki, Japan, this oire chisel series combines White Steel No.2 (Shirogami No.2) cutting edges with a triple-hollow back design. For woodworkers who value a keen edge, straightforward sharpening, and the details of traditional Japanese chisel construction.
FEATURES
- White Steel No.2 cutting edges: Yasuki White Steel No.2 (Shirogami No.2) is valued for its ease of sharpening and ability to take a keen edge.
- Triple-hollow back design: Three hollow-ground recesses are separated by flat lands that help guide the chisel during cutting. The term describes the back design, not three layers of steel or a three-piece set. The hollow layout on individual narrow sizes should be confirmed before ordering.
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U-shaped steel reinforcement: The steel is formed into a U-shaped section (kasugai), increasing the blade's strength and toughness.
- Black back finish: The manufacturer describes the Nomikatsu triple-hollow model with a black back finish.
- Oire chisel format: A traditional Japanese woodworking chisel type for joinery and detailed fitting work.
SET CONTENTS
The A-4 series is offered in the following configurations. Each listed blade width is included once per set.
- 5 pcs set: 9, 15, 24, 30, 36 mm
- 10 pcs set: 3, 6, 9, 12, 15, 18, 24, 30, 36, 42 mm
Series handle choices: Red oak, Silverberry (gumi), or Ebony.
The lead time will be confirmed after receiving your order.
ABOUT KOYAMA
Founded in 1955 in Miki, Hyogo, Japan, Koyama Hardware Co., Ltd. manufactures chisels, hand planes, saws, and circular saw blades. The company combines traditional blade-making skills with precision forging, machining, and laser processing.
Its chisels are produced in-house through forge welding, forging, heat treatment, grinding, sharpening, and handle fitting. This integrated approach brings Miki's blade-making tradition to the woodworking tools you use at the bench.
Blade-making process
Koyama's chisel-making process includes forge welding and hot forging of blade steels such as Yasuki steel and special high-speed steel, followed by spheroidizing annealing under a nitrogen purge. The blades are coated with tonoko powder and quenched in water, as in Japanese swordmaking. They are then tempered, ground, and sharpened.