Stainless Steel Pipe Dimensions & Sizes Chart (Schedule 40, 80 Pipe)

Accurately understanding the sizing system and wall thickness grades (Schedule) of stainless steel pipes is a prerequisite for ensuring pressure resistance, flow rate matching, and compliant design. This article focuses on the commonly used Schedule 40 and Schedule 80 to help quickly establish selection logic.

Core Parameters of Stainless Steel Pipe Dimensions
NPS (Nominal Pipe Size): Nominal diameter in imperial units, such as NPS 2”.
OD (Outside Diameter): A fixed value, for example, NPS 2” corresponds to an OD of 60.3mm.
Schedule Wall Thickness Grade: Determines the actual wall thickness and pressure resistance, such as Sch 40 and Sch 80.

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