The standard specifications of pipe fittings that are globally accepted are Metric and Standard English.

Given below are a variety of choices available according to industry standards and customer advantage.

Metric Sizes
Metric sizes measure in millimeter and vary from as small as 10mm to as large as1000mm.

<10mm
10mm - 20mm
20mm - 30mm
30mm - 40mm
40mm - 50mm
50mm - 100mm
100mm - 200mm
200mm - 500mm
500mm - 1000mm
>1000mm

Standard English Sizes:
Standard English sizes are calibrated in inches and their size ranges from 1/8" to 36".

MMmET
1/8"	2"	10"	26"
1/4"	2 1/2"	12"	28"
3/8"	3"	14"	30"
1/2"	3 1/2"	16"	32"
3/4"	4"	18"	34"
1"	5"	20"	36"
1 1/4"	6"	22"	Other Size <36"
1 1/2"	8"	24"	Other Size >36"