Products

Standard Pipe Sizes

Except for specialist applications, commercially available pipe comes in standard sizes.  Pipes in a variety of materials - including carbon steel, steel alloys, as well as some plastics - are manufactured in these standard sizes.

The pipe size is specified with two numbers: the nominal pipe diameter (or bore) and the pipe schedule.  This then sets the outside pipe diameter, the wall thickness (and hence the internal diameter).   A list of common standard pipe sizes are given below.

A Table of the Most Common Standard Pipe Sizes

Nominal Bore 1/2 inch (DN 15 mm), Outside Diameter 21.34 mm

Schedule		Sch. 5		Sch. 10			STD		XS		Sch. 160		XXS
Wall Thickness (mm)		1.65		2.11			2.77		3.73		4.78		7.47
Internal Diameter (mm)		18.04		17.12			15.80		13.90		11.78		6.40

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 3/4 inch (DN 20 mm), Outside Diameter 26.67 mm

Schedule		Sch.5		Sch. 10		STD		XS		Sch.160		XXS
Wall Thickness (mm)		1.65		2.11		2.87		3.91		5.56		7.82
Internal Diameter (mm)		23.37		22.45		20.93		18.85		15.55		11.03

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS. 

Nominal Bore 1 inch (DN 25 mm), Outside Diameter  33.40 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 160		XXS
Wall Thickness (mm)		1.65		2.77		3.38		4.55		6.35		9.09
Internal Diameter (mm)		30.1		27.86		26.64		24.3		20.7		15.22

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 1.5 inch (DN 40 mm), Outside Diameter  48.3 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 160		XXS
Wall Thickness (mm)		1.7		2.8		3.7		5.1		7.1		10.2
Internal Diameter (mm)		45.0		42.7		40.9		38.1		34.0		27.9

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 2 inch (DN 50 mm), Outside Diameter 60.3 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 160		XXS
Wall thickness (mm)		1.7		2.8		3.9		5.5		8.7		11.1
Internal Diameter (mm)		56.9		54.7		52.5		49.3		42.9		38.1

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 3 inch (DN 80 mm), Outside Diameter 88.9 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 160		XXS
Wall thickness (mm)		2.1		3.0		5.5		7.6		11.1		15.2
Internal Diameter (mm)		84.7		82.9		77.9		73.7		66.7		58.5

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 4 inch (DN 100 mm), Outside Diameter 114.3 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch.120		Sch. 160		XXS
Wall thickness (mm)		2.1		3.0		6.0		8.6		11.1		13.4		17.1
Internal Diameter (mm)		110.1		108.3		102.3		97.1		92.1		87.5		80.1

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 5 inch (DN 125 mm), Outside Diameter 141.3 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 120		Sch. 160		XXS
Wall thickness (mm)		2.8		3.4		6.6		9.5		12.7		15.9		19.0
Internal Diameter (mm)		135.7		134.5		128.1		122.3		115.9		109.5		103.2

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS.

Nominal Bore 6 inch (DN 150 mm), Outside Diameter 168.3 mm

Schedule		Sch. 5		Sch. 10		STD		XS		Sch. 120		Sch. 160		XXS
Wall thickness (mm)		2.8		3.4		7.1		11.0		14.3		18.3		22.0
Internal Diameter (mm)		162.7		161.5		154.1		146.3		139.7		131.7		124.3

Schedule 40 has same dimensions as STD.  Schedule 80 has same dimensions as XS. 

Nominal Bore 8 inch (DN 200 mm), Outside Diameter 219.1 mm

Schedule		Sch. 5		Sch. 10		Sch. 20		Sch. 30		Sch. 40		Sch. 60		Sch. 80
Wall thickness (mm)		2.8		3.8		6.4		7.0		8.2		10.3		12.7
Internal Diameter (mm)		213.5		211.5		206.3		205.1		202.7		198.5		193.7

Schedule		Sch. 100		Sch. 120		Sch. 140		Sch. 160		XXS
Wall thickness (mm)		15.1		18.2		20.6		23.0		22.2
Internal Diameter (mm)		188.9		182.7		177.9		173.1		174.7

Nominal Bore 10 inch (DN 250 mm), Outside Diameter 273.0 mm

Schedule		Sch. 5		Sch. 10		Sch. 20		Sch. 30		Sch. 40		Sch. 60		Sch. 80
Wall thickness (mm)		3.4		4.2		6.4		7.8		9.3		12.7		15.1
Internal Diameter (mm)		266.2		264.6		260.2		257.4		254.4		247.6		242.8

Schedule		Sch. 100		Sch. 120		Sch. 140		Sch. 160		XXS
Wall thickness (mm)		18.2		21.4		25.4		28.6		25.4
Internal Diameter (mm)		236.6		230.2		222.2		215.8		222.3

Nominal Bore 12 inch (DN 300 mm), Outside Diameter 323.9 mm

Schedule		Sch. 5s		Sch. 5		Sch. 10		Sch. 20		Sch. 30		Sch 40s		Sch. 40
Wall thickness (mm)		4.0		4.2		4.6		6.4		8.4		9.5		10.3
Internal Diameter (mm)		315.9		315.5		314.7		311.1		307.1		304.9		303.3

Schedule		Sch. 60		Sch. 80		Sch. 100		Sch. 120		Sch. 140		Sch. 160
Wall Thickness (mm)		14.3		17.5		21.4		25.4		28.6		33.3
Internal Diameter (mm)		295.3		228.9		281.1		273.1		266.7		257.3

Nominal Bore 14 inch (DN 350 mm), Outside Diameter 355.6 mm

Schedule		Sch. 5s		Sch. 10S		Sch. 10		Sch. 20		Sch. 30		Sch 40		XS
Wall thickness (mm)		4.0		4.8		6.4		7.9		9.5		11.1		12.7
Internal Diameter (mm)		347.7		346.0		342.9		339.8		336.6		333.3		330.2

Schedule		Sch. 60		Sch. 80		Sch. 100		Sch. 120		Sch. 140		Sch. 160
Wall Thickness (mm)		15.1		19.1		23.8		27.8		31.8		35.7
Internal Diameter (mm)		325.4		317.5		308.0		300.0		292.1		284.2

STD has same dimensions as Schedule 30.