The standard connection threads are ‘G’ pipes threads to BS.2449 and ISO.228/1 (formerly B.S.P. Parallel). We can supply variations on these to suit the machine requirements. The regular variations are shown below. If these are required add the Rotary Union part number.
All rotary connections (dimension “A”) can be provided with RH or LH threads to suit the direction of rotation.
TYPE B.E.
Type S.T.
Type R.S.
| Code | Spindle thread ‘A’ (-R ou -L) |
Adaptor threads ‘B’ ‘N’ & ‘O’ |
| F | ‘G’ pipe thread (parallel) Female | ‘G’ pipe thread (parallel) |
| M.B. | Metric thread* | ‘G’ pipe thread (parallel) |
| M.N. | Métric thread* | N.P.T. |
| N.P.T. | N.P.T. | ‘G’ pipe thread (parallel) |
| N.P.T.2 | N.P.T. | N.P.T. |
| N.P.T.3 | ‘G’ pipe thread (parallel) | N.P.T. |
| P.P. | A.P.P.T./NPSM | ‘G’ pipe thread (parallel) |
| P.P.N. | A.P.P.T./NPSM | N.P.T. |
| T.R. | ‘R’ pipe thread (taper) | ‘G’ pipe thread (parallel) |
| T.R.2 | ‘R’ pipe thread (taper) | ‘R’ pipe thread (taper) |
| U | Unified thread* | ‘G’ pipe thread (parallel) |
| M.B. | Unified thread* | N.P.T. |
*See sizes below
Spindle thread ‘A’ (-R ou -L)
| Nominal size | Unified (code U) | Metric (code M) |
| 8 (¼”) | ½” – 20 UNF | M12 x 1.25 |
| 10 (3/8″) | 5/8″ – 18 UNF | M15 x 1.50 |
| 15 (½”) | ¾” – 16 UNF | M22 x 1.50 |
| 20 (¾”) | 1″ – 14 UNS | M30 x 1.50 |
| 25 (1″) | 1½” – 12 UNF | M35 x 1.50 |
| 32 (1¼”) | 1¾” – 12 UN | M40 x 1.50 |
| 40 (1½”) | 2″ – 12 UN | M50 x 1.50 |
| 50 (2″) | 2½” – 12 UN | M60 x 2.00 |
| 65 (2½”) | 3″ – 12 UN | M76 x 2.00 |
| 80 (3″) | 3½” – 12 UN | M90 x 2.00 |
