When selecting a hose and coupling for a specific application, it is crucial to consider both dimensions and tolerances. Incorrect dimensions or an inadequate fit can lead to leaks, pressure losses, equipment damage or even downtime. Therefore, accuracy in selection is paramount - especially in systems where high pressures, temperature fluctuations or aggressive media are present.
Below you will find a table with different dimensions and tolerances that are important to consider when selecting hose and fittings for a specific application.
| Size designation | Slang ID | R-thread (BSP) | NPTF | JIC37°. UNF thread | SAE45 UNF thread | DKL o. DKO-L | Pipe spigot Pressure class L | DKS o. DKO-S | Pipe spigot Pressure class S | DKM | DKF |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -2 | 1/8″ | 1/8″-28 | 1/8″-27 | 5/16″-24 | 5/16″-24 | - | - | - | - | - | M16x1.5 |
| -3 | 3/16″ | - | - | 3/8″-24 | 3/8″-24 | M12x1,5 | 6 | M16x1.5 | 8 | M12x1,5 | - |
| -4 | 1/4″ | 1/4″-19 | 1/4″-18 | 7-16″-20 | 7/16″-20 | M14x1.5 | 8 | M18x1.5 | 10 | M14x1.5 | M20x1.5 |
| -5 | 5/16″ | - | - | 1/2″-20 | 1/2″-20 | M16x1.5 | 10 | M20x1.5 | 12 | M16x1.5 | - |
| -6 | 3/8″ | 3/8″-19 | 3/8″-18 | 9/16″-18 | 5/8″-18 | M18x1.5 | 12 | M22x1.5 | 14 | M18x1.5 | M24x1.5 |
| -7 | 13/32″ | - | - | 5/8″-18 | 11/16″-16 | - | - | - | - | - | - |
| -8 | 1/2″ | 1/2″-14 | 1/2″-14 | 3/4″-16 | 3/4″-16 | M22x1.5 | 15 | M24x1.5 | 16 | M22x1.5 | M30x1.5 |
| -10 | 5/8″ | 5/8″-14 | - | 7/8″-14 | 7/8″-14 | M26x1.5 | 18 | M30x2 | 20 | M26x1.5 | - |
| -12 | 3/4″ | 3/4″-14 | 3/4″-14 | 1 1/16″-12 | 1 1/16″-14 | M30x2 | 22 | M36x2 | 25 | M30x1.5 | M36x1.5 |
| -14 | 7/8″ | 7/8″-14 | - | 1 | 3/16″-12 | 1 1/4″-12 | - | - | - | - | - |
| -16 | 1″ | 1″-11 | 1″-11 1/2 | 1 5/16″-12 | 1 3/8″-12 | M36x2 | 28 | M42x2 | 30 | M38x1.5 | M45x1.5 |
| -18 | 1 1/8″ | - | - | 1.1/2″-12 | - | - | - | - | - | - | - |
| -20 | 1 1/4″ | 1 1/4″-11 | 1 1/4″-11 1/2 | 1 5/8″-12 | - | M45x2 | 35 | M52x2 | 38 | M45x1.5 | M52x1,5 |
| -24 | 1 1/2″ | 1 1/2″-11 | 1 1/2″-11 1/2 | 1 7/8″-12 | - | M52x2 | 42 | - | - | M52x1,5 | M58x2 |
| -32 | 2″ | 2″-11 | 2″-11 1/2 | 2 1/2″-12 | - | - | - | - | - | M65x2 | - |
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