The Parker CPI / A-LOK NPT Male Thermocouple Connector (FH4BZ / MTC) connects a fractional tube to an NPT male thread as a thermocouple connector. It comes in 22 size combinations with tube outer diameters from 1/16" to 1". CPI uses a single ferrule and A-LOK a double ferrule.
| Type | NPT male thermocouple connector: connects a fractional tube to an NPT male thread |
| Part Numbers | CPI 1-1 FH4BZ, A-LOK 1MTC1N ~ CPI 16-16 FH4BZ, A-LOK 16MTC16N |
| 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 |
| Note | Tube stop drilled out to allow the thermocouple to pass through |
| Sizes (inches): Tube O.D. and NPT Thread Size by CPI Part Number (A-LOK Part Number) | 1-1 FH4BZ (1MTC1N): tube 1/16" x NPT 1/16" / 1-2 FH4BZ (1MTC2N): tube 1/16" x NPT 1/8" / 1-4 FH4BZ (1MTC4N): tube 1/16" x NPT 1/4" / 2-1 FH4BZ (2MTC1N): tube 1/8" x NPT 1/16" / 2-2 FH4BZ (2MTC2N): tube 1/8" x NPT 1/8" / 2-4 FH4BZ (2MTC4N): tube 1/8" x NPT 1/4" / 3-2 FH4BZ (3MTC2N): tube 3/16" x NPT 1/8" / 3-4 FH4BZ (3MTC4N): tube 3/16" x NPT 1/4" / 4-2 FH4BZ (4MTC2N): tube 1/4" x NPT 1/8" / 4-4 FH4BZ (4MTC4N): tube 1/4" x NPT 1/4" / 4-6 FH4BZ (4MTC6N): tube 1/4" x NPT 3/8" / 4-8 FH4BZ (4MTC8N): tube 1/4" x NPT 1/2" / 5-4 FH4BZ (5MTC4N): tube 5/16" x NPT 1/4" / 6-4 FH4BZ (6MTC4N): tube 3/8" x NPT 1/4" / 6-6 FH4BZ (6MTC6N): tube 3/8" x NPT 3/8" / 6-8 FH4BZ (6MTC8N): tube 3/8" x NPT 1/2" / 6-12 FH4BZ (6MTC12N): tube 3/8" x NPT 3/4" / 8-8 FH4BZ (8MTC8N): tube 1/2" x NPT 1/2" / 8-12 FH4BZ (8MTC12N): tube 1/2" x NPT 3/4" / 10-12 FH4BZ (10MTC12N): tube 5/8" x NPT 3/4" / 12-12 FH4BZ (12MTC12N): tube 3/4" x NPT 3/4" / 16-16 FH4BZ (16MTC16N): tube 1" x NPT 1" |