Pocket knife blades come in two slightly different sizes to match the blade housings of different pocket knife models. Though blade designs may differ, blade dimensions remain roughly the same; this is necessary to ensure a blade will fit most types of pocket knife.
There are two sizes of pocket knife blade commonly available in the UK at present;
The standard blade size, which fits most pocket knife models, is 60mm (2½in) from point to point, measured along the cutting edge, and 0.61mm (1/32in) thick.
Also available are blades measuring 50mm (2in) from point to point, and 0.43mm (1/64in) thick. These are designed for use with the very smallest pocket knives (such as those designed to fit on keychains)
The weight of a pocket knife blade is almost negligible, at around 5g (lighter than a ten pence piece!).