CR Pipe 1CR Pipe 2CR Pipe 3CR Pipe 4CR Pipe 5 Weight Chart We manufacture from 9 mm (3 sut) to 38.1 mm (12 sut) wall thickness starting from 0.25 mm to 0.4 mm 1. Our CR Pipe Product range comprises various sizes from 3 sut to 3″ with 9 mm to 38.1 mm.2. We make Steel Tubes of thickness ranging from 0.25 mm to 0.4 mm Weight for 12 foot length. Wall thickness in mm