What’s the tolerance of your cast iron bar?

OD at 25-100mm, 0-2.5mm
OD at 100-200mm, 0-4mm
OD at 200-300mm, -1-6mm
OD at 300-450mm, -2-10mm

What's the tolerence of your cast iron tube?

OD at 60-100mm, (OD +3mm,ID -6mm)
OD at 100-200mm,(OD +4mm,ID -7mm)
OD at 200-280mm,(OD +5mm,ID -8mm)
OD at 280-320mm,(OD +6mm,ID -10mm)

Do you have stock material in different sizes?

The solid bars most sizes available, the tube need custom made.