Standard plate thicknesses and round bar diameters

Common sizes held by European metal stockists. Check your supplier, since availability varies by alloy.

Plate thickness (mm)

1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200

Round bar diameter (mm)

3, 4, 5, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200

Designing to stock

Milled faces are usually skimmed, so allow about 0.5 mm below the plate thickness: design 19.5 mm for 20 mm plate. For turned parts, keep the largest diameter about 1 mm under a bar size. More in design around standard stock sizes.