{
  "metadata": {
    "id": "smc-kq2tw07-00a",
    "name": "SMC KQ2TW07-00A Union Cross (1/4\" OD)",
    "type": "connector",
    "description": "SMC KQ2 series union cross fitting for 1/4\" OD tubing. A four-way push-to-connect fitting that joins four 1/4\" tube lines at a single intersection, allowing one inlet to supply three outlets or interconnection of four lines. All ports accept 1/4\" outer diameter tubing, forming a plus-shaped junction.",
    "manufacturer": "SMC",
    "part_number": "KQ2TW07-00A",
    "datasheet_url": "https://www.smcusa.com/products/cross-kq2tw-00~177595",
    "tags": [
      "SMC",
      "cross",
      "push-to-connect",
      "1/4 OD tube",
      "fitting"
    ],
    "schema_version": "1.4.0",
    "version": "0.2.0",
    "taxonomy": [
      "mechanical.pneumatic"
    ]
  },
  "domains": [
    {
      "domain": "pneumatic",
      "resources": [
        {
          "id": "tube_port_A",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "quick_connect",
          "tube_od_inch": 0.25,
          "port_size": "1/4\" OD tube",
          "working_pressure_bar": 10,
          "max_pressure_bar": 10,
          "compatible_fluids": [
            "compressed_air"
          ],
          "fluid_temperature_C": [
            -5,
            60
          ],
          "seal_type": "o_ring",
          "description": "Push-in tube port (1/4\" OD) - side A"
        },
        {
          "id": "tube_port_B",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "quick_connect",
          "tube_od_inch": 0.25,
          "port_size": "1/4\" OD tube",
          "working_pressure_bar": 10,
          "max_pressure_bar": 10,
          "compatible_fluids": [
            "compressed_air"
          ],
          "fluid_temperature_C": [
            -5,
            60
          ],
          "seal_type": "o_ring",
          "description": "Push-in tube port (1/4\" OD) - side B"
        },
        {
          "id": "tube_port_C",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "quick_connect",
          "tube_od_inch": 0.25,
          "port_size": "1/4\" OD tube",
          "working_pressure_bar": 10,
          "max_pressure_bar": 10,
          "compatible_fluids": [
            "compressed_air"
          ],
          "fluid_temperature_C": [
            -5,
            60
          ],
          "seal_type": "o_ring",
          "description": "Push-in tube port (1/4\" OD) - side C"
        },
        {
          "id": "tube_port_D",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "quick_connect",
          "tube_od_inch": 0.25,
          "port_size": "1/4\" OD tube",
          "working_pressure_bar": 10,
          "max_pressure_bar": 10,
          "compatible_fluids": [
            "compressed_air"
          ],
          "fluid_temperature_C": [
            -5,
            60
          ],
          "seal_type": "o_ring",
          "description": "Push-in tube port (1/4\" OD) - side D"
        }
      ],
      "interfaces": [
        {
          "id": "four_way_splitter",
          "protocol": {
            "type": "pneumatic",
            "role": "splitter"
          },
          "requires": [
            {
              "function": "pneumatic_connection",
              "count": 4
            }
          ],
          "constraints": [
            {
              "tube_od_inch": 0.25
            },
            {
              "max_pressure_bar": "<=10.0"
            },
            {
              "compatible_fluids": "compressed_air"
            }
          ],
          "max_instances": 1,
          "description": "4-way tube splitter interface (connects four 1/4\" tube lines together in a cross junction)",
          "name": "Four Way Splitter"
        }
      ],
      "metadata": {
        "working_medium": "compressed_air",
        "max_pressure_bar": 10,
        "min_pressure_bar": -0.1,
        "fluid_temperature_C": [
          -5,
          60
        ],
        "connection_type": "union_cross"
      }
    },
    {
      "domain": "mechanical",
      "resources": [
        {
          "id": "cross_body",
          "functions": [
            {
              "name": "mounting"
            }
          ],
          "material": "pbt_plastic",
          "dimensions_mm": {
            "length": 20,
            "width": 20,
            "height": 20
          },
          "weight_g": 8,
          "description": "PBT plastic cross body with four tube ports"
        }
      ],
      "interfaces": [],
      "metadata": {
        "mounting_method": "tube_supported",
        "orientation": "any"
      }
    },
    {
      "domain": "thermal",
      "resources": [],
      "interfaces": [],
      "metadata": {
        "operating_temperature_C": [
          -5,
          60
        ],
        "storage_temperature_C": [
          -20,
          80
        ]
      }
    }
  ],
  "design_rules": [
    "Fully insert all tubes into the fitting; each should lock in place with an airtight seal",
    "Plan the routing so that the cross fitting is not under mechanical stress from bent tubes on all four sides",
    "If a port is not used, plug it with a proper 1/4\" push-to-connect plug to avoid leaks"
  ],
  "validation_requirements": [
    "Ensure all connected tubes are 1/4\" OD and are cut squarely for best sealing",
    "Confirm that all four ports have either a tube or a plug inserted (no open ports)",
    "After installation, perform a pressure test to ensure no leakage at any of the four connections"
  ],
  "usage_notes": "A union cross provides a convenient way to split a supply line into three directions or to interconnect multiple lines in a pneumatic circuit. It essentially creates a common node for four tubing connections. Common in complex pneumatic control systems where a single pressure source needs to feed several branches.",
  "application_examples": [
    "Distributing air from one inlet to three different pneumatic cylinders or valves",
    "Creating a common pressure node for four sensors that all need to measure the same source"
  ],
  "compatibility_notes": "Works with any standard 1/4\" OD tubing. All four connections are identical and share the same internal cavity, so pressure equalizes among them. Use only with recommended fluids (air or inert gases, and water if compatible with tubing).",
  "warnings": [
    "As with the union tee, all connected lines are common; an issue (leak or disconnect) on any one line will affect the whole system",
    "Not a flow control or directional device; it won't restrict or direct flow to specific branches without additional valves",
    "Keep the fitting clean and free of contaminants; internal O-rings could be compromised by dirt or oil leading to leaks"
  ]
}