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Metric to Imperial Pipe Conversion

When the industry moved from imperial to metric sizing it was done in an uncoordinated fashion. Consequently sizes are different for plastic and steel products! The following is a quick conversion chart showing sizes of stainless steel, mild steel, plastic and copper tube or pipe.

Metric to Imperial Pipe Conversion
Imperial Nominal Bore
Mild & Stainless Steel
Metric Nominal Bore
Mild & Stainless Steel
Metric Actual O.D.
PVC, ABS, MDPE,POLY PHILMAC
Metric O.D.
Copper Tube
Metric
Thickness
1/32"0.80mm
1/16"1.59mm
1/8"6mm6mm3.18mm
1/4"8mm12mm8mm6.30mm
3/8"10mm16mm10mm9.50mm
1/2"15mm20mm15mm12.70mm
3/4"20mm25mm22mm19.05mm
1"25mm32mm28mm25.40mm
1 1/4"32mm40mm35mm31.75mm
1 1/2"40mm50mm42mm38.10mm
2"50mm63mm54mm50.80mm
2 1/2"65mm75mm67mm63.50mm
3"80mm90mm76mm76.20mm
4"100mm110mm108mm101.60mm
5"125mm125mm133mm127.00mm
6"150mm140/160mm159mm152.40mm
7"175mm160mm
8"200mm200mm
9"225mm225mm
10"250mm250mm
11"275mm280mm
12"300mm315mm
14"350mm
16"400mm
18"450mm
20"500mm
22"550mm
24"600mm

Conversions are based on a nominal 25mm or exact 25.4mm to 1 inch

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