Nakahashi 1/2" Japanese Mortise Chisel & Bit

Scott & Sargeant stock these Japanese-manufactured mortice chisels and auger bits because, in direct comparison testing, they consistently outperform alternatives. The steel quality and finishing standard are the reason — not a marketing claim.

The auger bit features a single cutting spur and single spiral, which clears chips efficiently and cuts evenly at speed, even in dense hardwoods. The single-spur geometry is straightforward to resharpen without specialist equipment.

The heat-treated chisel body is precision finished by hand and ground to a sharper cutting angle than the traditional English pattern, reducing the effort required at the machine.

Augers are supplied over length to suit a range of machines and may require trimming with a hacksaw to match the specific depth of your mortiser.

Applications: morticing in hardwood, morticing in softwood

Key Features:

— Japanese manufacture from high-grade steel — consistent quality and edge retention that outperforms alternatives in direct testing
— Single-spur auger geometry — cuts evenly and quickly, including in dense hardwoods, without grabbing or wandering
— Single spiral flute design — efficient chip clearance reduces heat build-up and keeps the cut clean
— Single-spur configuration — straightforward to resharpen without specialist tooling, reducing downtime
— Heat-treated chisel body — hardness is maintained through demanding production use without deformation
— Hand-finished precision grinding — tighter tolerances than machine-finished alternatives, ensuring accurate mortice walls
— Sharper cutting angle than English pattern — reduced effort at the machine and less stress on the drive system
— Supplied over length — compatible with a range of mortising machines — trim to suit your specific spindle depth
— Maximum mortise depth 80mm — suitable for structural joinery and deep tenon work
— Chisel body width 12.7mm, overall length 152mm — standard sizing for compatibility with conventional hollow chisel mortisers