Standard sizes for stainless steel (SS) pipe vary according to the specific standards that different countries and industries follow. However, some common standard sizes for stainless steel pipe include:- 1/8″ (3.175mm) OD to 12″ (304.8mm) OD- 0.035″ (0.889mm) wall thickness to 2″ (50.8mm) wall thickness – Standard lengths are typically 20 feet (6.096 m) to 24 feet (7.315 m) It is worth noting that these sizes are just some examples of commonly used stainless steel pipe sizes, and different industries or suppliers may provide variable or custom sizes according to specific requirements.