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Outside to Inside Diameter Conversion Chart

Wire Gauge

Outside Diameter (OD)

Inside Diameter (ID)

14g

8mm

4.74mm

10mm

6.74mm

16g

6mm

3.42mm

7mm

4.42mm

8mm

5.42mm

10mm

7.42mm

12mm

9.42mm

17g

6mm

3.7mm

7mm

4.7mm

8mm

5.7mm

8.5mm

6.2mm

18g

4.5mm

2.46mm

6mm

3.96mm

7mm

4.96mm

8mm

5.96mm

10mm

7.96mm

19g

4.3mm

2.476mm

6mm

4.176mm

7mm

5.176mm

20g

4mm

2.374mm

5mm

3.374mm

6mm

4.374mm

22g

5mm

3.714mm