1/4” Mortising Bit for Hollow Chisel Mortising Machines — 9-1/2” Long

The HMC250B is a 1/4-inch mortising bit for hollow chisel mortising machines, supplied in the 9-1/2-inch long length. In hollow chisel mortising, the drill bit and hollow chisel work together: the bit bores the round bulk of material while the hollow square chisel, which surrounds the bit, is simultaneously pressed in to produce clean square corners and flat cheeks. The 1/4-inch size is a standard mortise width for small furniture joinery, cabinet face frames, and light rail-and-stile work — accommodating 1/4-inch tenons, 1/4-inch loose tenon stock, and hardware that requires a 1/4-inch mortise slot. The 9-1/2-inch length suits deeper mortises and machines with greater spindle travel. This bit is for use inside the matching HMC250C hollow chisel; order HMC250S for the complete chisel and bit set. Confirm machine compatibility (chuck size, collet, and spindle travel) before ordering — mortising bits require the correct bit-to-chisel clearance for clean operation.