Circlip – carbon spring steel.
Washer – steel, zn plated.
Body – s.g. iron.
‘O’ rings – nitrite rubber .
Spindle – steel, e.ni plated.
The NHP Swivel Joint is the simplest form of swivel joint used mainly for very slow occasional movements
| Nominal size |
Part No. |
| 8 (¼”) | 16899 |
| 10 (3/8″) | 16900 |
| 15 (½”) | 16901 |
| 20 (¾”) | 16902 |
| 25 (1″) | 16903 |
| 32 (1¼”) | 16904 |
| 40 (1½”) | 16905 |
| 50 (2″) | 16906 |
N.H.P. Swivel Joint – Dimensions
‘G’ is the designation for parallel pipe threads to BS2779 and ISO 228/1
| Nominal size |
A & B | C | D | E | F | G | H | |||||||
| 8 (¼”) | G.¼” | 29 | 48 | 35 | 8 | 18 | 6 | |||||||
| 10 (3/8″) | G.3/8″ | 30 | 49 | 35 | 10 | 18 | 10 | |||||||
| 15 (½”) | G.½” | 49 | 84 | 57 | 16 | 32 | 12 | |||||||
| 20 (¾”) | G.¾” | 56 | 90 | 57 | 19 | 32 | 17 | |||||||
| 25 (1″) | G.1″ | 70 | 116 | 76 | 22 | 43 | 22 | |||||||
| 32 (1¼”) | G.1¼” | 76 | 122 | 76 | 25 | 43 | 30 | |||||||
| 40 (1½”) | G.1½” | 87 | 149 | 95 | 25 | 64 | 36 | |||||||
| 50 (2″) | G.2″ | 94 | 156 | 95 | 32 | 64 | 45 | |||||||
| Dimensions in millimetres | ||||||||||||||
Operational Guidelines
Fluids : Water, mineral oils and lubricated compressed air.
All fluids must be clean and free from abrasive and corrosive particles.
Pressure : 85 bar maximum.
Vacuum : 740 mm Hg.
Temperature : 100°C maximum.
Speed : slow intermittent rotary movement.
| Flow capacity | |||
| Nominal size |
Liquids* m³/h |
Liquids* l/min |
Air** m³/h |
| 8 (¼”) | 0.3 | 5 | 10 |
| 10 (3/8″) | 0.8 | 14 | 30 |
| 15 (½”) | 1.2 | 20 | 42 |
| 20 (¾”) | 2.4 | 41 | 85 |
| 25 (1″) | 4.1 | 68 | 142 |
| 32 (1¼”) | 7.6 | 127 | 264 |
| 40 (1½”) | 11.0 | 183 | 380 |
| 50 (2″) | 17.2 | 283 | 594 |
| * Flow at a velocity of 3 m/s (applies also to other liquids) ** Flow at a velocity of 15 m/s and a pressure of 6 bar |
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