Table of Contents
Content Information
This section provides pipe thickness tables designers can use for estimation purposes. The values for concrete pipe are based on the AASHTO specifications in effect at the time of publication of this section.
Refer to DR-202 for concrete arch and elliptical pipe thicknesses.
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inside diameter
(inches)
wall thickness
(inches)
inside Class 1 Class 2 Class 3 4 ⅝ ¾ ¾ 6 ⅝ ¾ ⅞ 8 ¾ ⅞ 1⅛ 10 ⅞ 1 1¼ 12 1 1⅜ 1¾
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Class 1500D to Class 3750D (ASTM C 76/AASHTO M 170, Wall B) inside diameter
(inches)
wall thickness
(inches)
12 2 15 2¼ 18 2½ 21 2¾ 24 3 27 3¼ 30 3½ 33 3¾ 36 4 42 4½ 48 5a 54 5½a 60 6a 66 6½a 72 7a 78 7½a,b 84 8a,b 90 8½a,b 96 9a,b 102 9½a,b 108 10a,b a 3750D Requires special design.
b 3000D Requires special design.
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(Materials IM 440 ) nominal diameter
(inches)
nominal thickness
(inches)
3¾ and under 0.188 14 0.250 16 0.281 18 0.312 20 and 22 0.344 24 0.375 26 0.406 28 0.438 30 0.469 32 0.500 34 and 36 0.531 38 0.562 40 0.594 42 0.626 44 and 46 0.656 48 0.688 50 0.719 52 0.750 54 0.781 56 and 58 0.812 60 0.844 62 0.875 64 0.906 66 and 68 0.938 70 0.969 72 1.000
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Chronology of Changes Date Revision Description 1/20/2026 New 2026 Update
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Book navigation for 1B-5: Pipe Thickness Tables
