{
  "metadata": {
    "id": "fasparts-1-2npt-to-1-4npt",
    "name": "1/2\" NPT to 1/4\" NPT Reducing Coupling (F-F)",
    "type": "connector",
    "description": "Brass reducing coupler with 1/2\" female NPT and 1/4\" female NPT ends. Allows connection between a 1/2\" NPT male fitting and a 1/4\" NPT male fitting. Often used to step down pipe size in pneumatic, fuel, or hydraulic systems. Sturdy brass construction suitable for water, oil, gas (WOG) applications up to ~1000 PSI.",
    "manufacturer": "FasParts",
    "part_number": "N/A",
    "datasheet_url": "",
    "tags": [
      "adapter",
      "reducing",
      "coupling",
      "NPT",
      "brass",
      "fitting"
    ],
    "schema_version": "1.4.0",
    "version": "0.2.0",
    "taxonomy": [
      "mechanical.pneumatic",
      "mechanical.adapter"
    ]
  },
  "domains": [
    {
      "domain": "pneumatic",
      "resources": [
        {
          "id": "large_female_port",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "threaded_port",
          "thread_standard": "NPT",
          "thread_size": "1/2\"",
          "thread_gender": "female",
          "port_size": "1/2\"",
          "working_pressure_bar": 68.9,
          "max_pressure_bar": 68.9,
          "compatible_fluids": [
            "compressed_air",
            "water",
            "oil",
            "inert_gas"
          ],
          "fluid_temperature_C": [
            -10,
            80
          ],
          "seal_type": "thread_sealant",
          "description": "Female 1/2\"-14 NPT port (receives 1/2\" NPT male thread)"
        },
        {
          "id": "small_female_port",
          "functions": [
            {
              "name": "pneumatic_connection"
            }
          ],
          "connector_type": "threaded_port",
          "thread_standard": "NPT",
          "thread_size": "1/4\"",
          "thread_gender": "female",
          "port_size": "1/4\"",
          "working_pressure_bar": 68.9,
          "max_pressure_bar": 68.9,
          "compatible_fluids": [
            "compressed_air",
            "water",
            "oil",
            "inert_gas"
          ],
          "fluid_temperature_C": [
            -10,
            80
          ],
          "seal_type": "thread_sealant",
          "description": "Female 1/4\"-18 NPT port (receives 1/4\" NPT male thread)"
        }
      ],
      "interfaces": [
        {
          "id": "large_port_input",
          "protocol": {
            "type": "pneumatic",
            "role": "input"
          },
          "requires": [
            {
              "function": "pneumatic_connection",
              "count": 1
            }
          ],
          "constraints": [
            {
              "thread_standard": "NPT"
            },
            {
              "thread_size": "1/2\""
            },
            {
              "thread_gender": "male"
            },
            {
              "max_pressure_bar": "<=68.9"
            },
            {
              "compatible_fluids": [
                "compressed_air",
                "water",
                "oil",
                "inert_gas"
              ]
            }
          ],
          "max_instances": 1,
          "description": "1/2\" NPT female input for larger male fittings",
          "name": "Large Port Input"
        },
        {
          "id": "small_port_output",
          "protocol": {
            "type": "pneumatic",
            "role": "output"
          },
          "requires": [
            {
              "function": "pneumatic_connection",
              "count": 1
            }
          ],
          "constraints": [
            {
              "thread_standard": "NPT"
            },
            {
              "thread_size": "1/4\""
            },
            {
              "thread_gender": "male"
            },
            {
              "max_pressure_bar": "<=68.9"
            },
            {
              "compatible_fluids": [
                "compressed_air",
                "water",
                "oil",
                "inert_gas"
              ]
            }
          ],
          "max_instances": 1,
          "description": "1/4\" NPT female output for smaller male fittings",
          "name": "Small Port Output"
        }
      ],
      "metadata": {
        "working_medium": [
          "compressed_air",
          "water",
          "oil",
          "inert_gas"
        ],
        "max_pressure_bar": 68.9,
        "compatible_fluids": [
          "air",
          "water",
          "oil",
          "inert_gas"
        ]
      }
    },
    {
      "domain": "mechanical",
      "resources": [
        {
          "id": "coupling_body",
          "functions": [
            {
              "name": "mounting"
            }
          ],
          "material": "brass",
          "dimensions_mm": {
            "length": 25,
            "width": 20,
            "height": 15
          },
          "weight_g": 45,
          "description": "Brass reducing coupling body with hex flats"
        }
      ],
      "interfaces": [],
      "metadata": {
        "mounting_method": "threaded",
        "orientation": "any"
      }
    },
    {
      "domain": "thermal",
      "resources": [],
      "interfaces": [],
      "metadata": {
        "operating_temperature_C": [
          -10,
          80
        ],
        "storage_temperature_C": [
          -20,
          100
        ]
      }
    }
  ],
  "design_rules": [
    "Apply PTFE tape or thread sealant to male threads before screwing into each female port",
    "Tighten using the hexagonal section of the coupling to avoid twisting the connected pipes",
    "Use this adapter in a straight inline configuration (it's not an elbow or tee)"
  ],
  "validation_requirements": [
    "Ensure both connected male fittings are NPT standard (tapered) in the correct sizes",
    "Check that the reduction in diameter will not unduly restrict flow for the application",
    "Verify the adapter's material (brass) is compatible with the fluid and pressure"
  ],
  "usage_notes": "This fitting is useful for adapting a larger pipe or component (1/2\" NPT) to a smaller one (1/4\" NPT). For example, it can join a 1/2\" NPT outlet from a regulator or tank to a 1/4\" NPT hose or valve. The coupling has internal threads on both ends; no male threads on the adapter itself.",
  "application_examples": [
    "Connecting a 1/4\" NPT pressure hose to a 1/2\" NPT manifold outlet via reduction",
    "Adapting a large compressor tank port (1/2\" NPT) to fit a smaller 1/4\" NPT quick-connect coupling"
  ],
  "compatibility_notes": "Designed for NPT threads; do not mix with BSP threads without separate adapters. Both ends must have matching male NPT fittings to seal properly. The brass can handle common pneumatic pressures and moderate hydraulic pressures.",
  "warnings": [
    "Significant reduction in diameter can cause pressure drop or flow limitation; ensure it's acceptable in the system design",
    "Check for leaks especially when using with gas or fuel under pressure",
    "Not intended to bear structural loads—support the piping to prevent stress on the adapter"
  ]
}