Process connections
Most Alicat pressure and flow instruments come with threaded female NPT process connections by default, but we offer many customization options so you can easily integrate your new Alicat into your existing setup. After you select a port type, an applications engineer will recommend a specific port size in order to minimize dead volume and ensure your full-scale flow rate can be achieved.
NPT female threads
| NPT Size | M-Series | Whisper |
| 1/8” | 100 SCCM to 20 SLPM | 50 SCCM to 5 SLPM |
| 1/4″ | 50 to 100 SLPM | 10 to 20 SLPM |
| 1/2″ | 250 SLPM | 40 SLPM |
| 3/4″ | 500 to 2000 SLPM | 50 to 500 SLPM |
| 1” | – | – |
| 1-1/4” | 3000 SLPM | – |
| 1-1/2” | – | – |
| 2” | 4000 to 5000 SLPM | 1000 SLPM |
*Flow rates below 100 SCCM for M-Series use M5. Flow rates below 20 SCCM for Whisper use M5.
Alicat also offers threaded compression fittings for our default NPT process ports.
SAE threads
| Dash Size | O-Ring Thread | M-Series |
| M5 (10-32 UNF) | – | 0.5 to 10 SCCM |
| 2 | 5/16-24 | 10 to 50 SCCM |
| 4 | 7/16-20 | 100 SCCM to 10 SLPM |
| 6 | 9/16-18 | 20 to 100 SLPM |
| 8 | 3/4-16 | 250 SLPM |
| 10 | 7/8-14 | 500 to 1000 SLPM |
| 12 | 1-1/16-12 | 1500 to 2000 SLPM |
| 16 | 1-5/16-12 | 3000 SLPM |
| 24 | 1-7/8-12 | 4000 to 5000 SLPM |
BSPP “G” threads
| BSPP Size | M-Series |
| 1/8” | 100 SCCM to 20 SLPM |
| 1/4” | 50 to 100 SLPM |
| 3/8” | 50 to 250 SLPM |
| 1/2” | 250 SLPM |
| 3/4” | 500 to 2000 SLPM |
| 1.5” | 4000 to 5000 SLPM |
Compression fittings (Swagelok compatible)
| Compression Size | M-Series |
| 1/4″ compression | 100 SCCM to 100 SLPM |
| 3/8” compression | 50 to 250 SLPM |
| 1/2″ compression | 50 to 500 SLPM |
VCR fittings
| VCR Size and Gender | M-Series |
| 1/8” VCR female | 0.5 to 50 SCCM |
| 1/4” VCR male | 100 SCCM to 100 SLPM |
| 1/2″ VCR male | 50 to 250 SLPM |
| 1” VCR male | 500 to 3000 SLPM |
VCO fittings
| VCO Size | M-Series |
| 1/8” VCO | 0.5 to 50 SCCM |
| 1/4″ VCO | 100 SCCM to100 SLPM |
| 1” VCO | 500 to 3000 SLPM |
- NeSSI-compliant down port (NESSI)
- Down port, mounting screws thread from below (DPORT)
- Down port, mounting screws thread from above (TMDPORT)