Process connections

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.

Contact an applications engineer for support

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)