PIPE DIMENSIONS · TECHNICAL ANSWER

What is the difference between SCH 40 and SCH 40S?

Schedule 40 belongs to the general steel-pipe dimensional series, while Schedule 40S belongs to the stainless-steel schedule series. Their wall thicknesses match in some smaller sizes but are not identical across every NPS.

DETAILED EXPLANATION

Always check the actual wall thickness in the applicable dimensional standard instead of assuming the schedule number gives the same thickness.

Fitting bore and end preparation should match the ordered pipe wall.

Key points

  • SCH 40: ASME B36.10M series
  • SCH 40S: ASME B36.19M stainless series
  • Wall can match at some sizes
  • State NPS, schedule and dimensional standard
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