The Parker CPI / A-LOK NPT Female Bulkhead Connector (GH2BZ / FBC) connects a fractional tube to an NPT female thread as a bulkhead connector. It comes in 13 size combinations with tube outer diameters from 1/8" to 1". CPI uses a single ferrule and A-LOK a double ferrule.
| Type | NPT female bulkhead connector: connects a fractional tube to an NPT female thread |
| Part Numbers | CPI 2-2 GH2BZ, A-LOK 2FBC2N ~ CPI 16-16 GH2BZ, A-LOK 16FBC16N |
| Thread | NPT |
| Size Numbers | Size numbers in the part number are in sixteenths of an inch (for example 1/2" tube = 8, 1/4" thread = 4) |
| Connection Method | CPI: single ferrule / A-LOK: double ferrule |
| Material | 316 stainless steel (heat code traceable) is standard / Other materials: steel, brass, aluminum, nickel-copper, Hastelloy C, Alloy 600, titanium, 6Mo, Incoloy 625 and 825 |
| Material Codes | Material code added to the end of the part number after a hyphen: B brass / SS or 316 = 316 stainless steel / S steel / A aluminum / M Alloy 400 / HC Hastelloy C-276 / IN Alloy 600 / SS20 Carpenter 20 / 6MO 6Mo / 625 / 825 / T titanium |
| Sizes (inches): Tube O.D. and NPT Thread Size by CPI Part Number (A-LOK Part Number) | 2-2 GH2BZ (2FBC2N): tube 1/8" x NPT 1/8" / 3-2 GH2BZ (3FBC2N): tube 3/16" x NPT 1/8" / 4-2 GH2BZ (4FBC2N): tube 1/4" x NPT 1/8" / 4-4 GH2BZ (4FBC4N): tube 1/4" x NPT 1/4" / 5-2 GH2BZ (5FBC2N): tube 5/16" x NPT 1/8" / 5-8 GH2BZ (5FBC8N): tube 5/16" x NPT 1/2" / 6-4 GH2BZ (6FBC4N): tube 3/8" x NPT 1/4" / 8-6 GH2BZ (8FBC6N): tube 1/2" x NPT 3/8" / 8-8 GH2BZ (8FBC8N): tube 1/2" x NPT 1/2" / 10-8 GH2BZ (10FBC8N): tube 5/8" x NPT 1/2" / 12-12 GH2BZ (12FBC12N): tube 3/4" x NPT 3/4" / 14-12 GH2BZ (14FBC12N): tube 7/8" x NPT 3/4" / 16-16 GH2BZ (16FBC16N): tube 1" x NPT 1" |