"Bi-Metal‚" blades are basically a spring steel blade with hardened teeth laser welded along the edge, allowing long cutting life of the teeth with a flexible blade. Various teeth pitches are also avail. for the hacksaw blades. So as the best power hacksaw blade tooth pitch is to be selected to suit the material to be cut. Ideally use a coarse tooth power hacksaw blade for softer materials (i.e.; alum, nylon) then use a fine tooth power hacksaw blade for cutting harder steels. Power hacksaw teeth pitch range from 4TPI ‚14 TPI generally.
Power hacksaw blades will vary in size from aprox. 300mm to 850mm blades. Power hacksaw blades are avail still at Miller's Tooling as HSS blades or the preferred Bi-Metal blades