The Parker CPI / A-LOK Long Male Connector SAE/MS Straight Thread (ZH3BA / ZH3LA) is a long male connector that connects a fractional tube to an SAE/MS straight male thread. It comes in 5 size combinations with tube outer diameters from 1/4" to 1". CPI uses a single ferrule and A-LOK a double ferrule.
| Type | Long male connector, SAE/MS straight thread |
| Part Numbers | CPI 4-4 ZH3BA, A-LOK 4-4 ZH3LA ~ CPI 16-16 ZH3BA, A-LOK 16-16 ZH3LA |
| Size Numbers | Tube size numbers in the part number are in sixteenths of an inch (for example 1/2" tube = 8) |
| 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 |
| O-Rings | NBR O-rings are supplied as standard; for fluorocarbon O-rings add the suffix -VO to the part number (other O-rings available upon request) |
| Sizes (inches): tube O.D., thread size by CPI Part Number (A-LOK Part Number) | 4-4 ZH3BA (4-4 ZH3LA): tube 1/4", thread size 7/16-20 / 6-6 ZH3BA (6-6 ZH3LA): tube 3/8", thread size 9/16-18 / 8-8 ZH3BA (8-8 ZH3LA): tube 1/2", thread size 3/4-16 / 12-12 ZH3BA (12-12 ZH3LA): tube 3/4", thread size 1-1/16-12 / 16-16 ZH3BA (16-16 ZH3LA): tube 1", thread size 1-5/16-12 |