Referenced from the Foreword: "The nominal bores specified in this standard and the corresponding nominal sizes of pipe threads according to IS 554 : 1999/ISO 7-1 : 1994 ... are given in Annex A."
The source PDF encodes the fraction glyphs in column (2) below (rows viii, ix, xi, xiii) with a custom font mapping that has no Unicode equivalent, so they could not be extracted as text directly. They are reproduced here from IS 554's own standard nominal pipe-thread size progression (1/16, 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1¼, 1½, 2, 2½, 3, 3½, 4, 5, 6) cross-checked against this document's own Nominal Bore values, which repeat identically (6, 8, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, with no 90 mm size) in Table 1 and every other dimension table in this standard.
| Sl No. | Nominal Size of Pipe Threads (As per IS 554) | Corresponding Nominal Bore [As per IS 1239 (Part 1)] |
|---|---|---|
| i) | 1/16 | — |
| ii) | 1/8 | 6 |
| iii) | 1/4 | 8 |
| iv) | 3/8 | 10 |
| v) | 1/2 | 15 |
| vi) | 3/4 | 20 |
| vii) | 1 | 25 |
| viii) | 1¼ | 32 |
| ix) | 1½ | 40 |
| x) | 2 | 50 |
| xi) | 2½ | 65 |
| xii) | 3 | 80 |
| xiii) | 3½ | — |
| xiv) | 4 | 100 |
| xv) | 5 | 125 |
| xvi) | 6 | 150 |