Pipe Nipple Size Chart: ½" to 4" in Inches and mm
Pipe sizes in India are written in two ways: in inches (like 1”) and as nominal bore in millimetres (like 25 NB). Both mean the same pipe size. This chart shows how they match.
Size chart
| Size (inch) | Nominal bore (mm) |
|---|---|
| ½” | 15 |
| ¾” | 20 |
| 1” | 25 |
| 1¼” | 32 |
| 1½” | 40 |
| 2” | 50 |
| 2½” | 65 |
| 3” | 80 |
| 4” | 100 |
We make both GI and MS Pipe Nipples in every size on this chart.
Nominal bore is a name, not a measurement
“Nominal” means “in name”. A 25 NB pipe is not exactly 25 mm across on the outside or the inside. Nominal bore is simply the standard name for that pipe size. When you order, the size name is enough. You do not need to measure the pipe.
Size is fixed, length is your choice
Pipe nipples are made from standard pipe, so the size always matches the chart above. What changes from order to order is the length. We make nipples in standard lengths and in any custom length you need.
How to order
Send us the size, the length of each nipple, the quantity, and whether you need GI or MS. We will reply with a quote.
