{
  "name": "Hypodermic needle gauge dimensions (OD, ID, wall thickness, dead volume)",
  "description": "The physical dimensions behind a needle gauge number: nominal outer diameter, inner diameter, wall thickness, and dead volume per 25.4 mm of needle. Gauge number alone is not enough to answer 'will this needle prime my 10 uL syringe' or 'what is the ID of a 26s needle' \u2014 the wall marker ('s', 'RW') changes the ID at the same gauge, and dead volume is what actually determines whether a small-volume syringe can be primed. Two independent publishers are cited and they agree where they overlap: Hamilton, a syringe maker, covers 34 gauge down to 10 gauge with dead volumes; New England Small Tube, a tube manufacturer, covers 6 to 27 gauge in regular wall with millimetre figures of its own. Each keeps its own naming, so the same needle can appear twice \u2014 as '18 gauge needle' and as '18 RW' \u2014 with a separate quote behind each.",
  "url": "https://referencesource.org/syringe-needle-gauge-dimensions/",
  "licence": "Dimensional facts (a physical tolerance table) are not copyrightable; cited with attribution to the publishing vendor's technical reference page. No page content beyond the per-gauge figures is reproduced.",
  "last_verified": "2026-08-27",
  "stale_after": "2029-08-26",
  "sources": [
    "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
    "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf"
  ],
  "records": [
    {
      "gauge_number": "6 RW",
      "outer_diameter_mm": "5.15",
      "inner_diameter_mm": "4.39",
      "wall_thickness_mm": ".381",
      "id": "6-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/6-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "6      RW   5.15   5.13/5.18   .381   4.39     4.32/4.47",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "7 RW",
      "outer_diameter_mm": "4.57",
      "inner_diameter_mm": "3.81",
      "wall_thickness_mm": ".381",
      "id": "7-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/7-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "7      RW   4.57   4.57/4.60   .381   3.81     3.73/3.89",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "8 RW",
      "outer_diameter_mm": "4.19",
      "inner_diameter_mm": "3.43",
      "wall_thickness_mm": ".381",
      "id": "8-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/8-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "8      RW   4.19   4.17/4.22   .381   3.43     3.35/3.51",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "9 RW",
      "outer_diameter_mm": "3.76",
      "inner_diameter_mm": "3.00",
      "wall_thickness_mm": ".381",
      "id": "9-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/9-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "9      RW   3.76   3.74/3.78   .381   3.00     2.92/3.07",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "10 gauge needle",
      "outer_diameter_mm": "3.404",
      "inner_diameter_mm": "2.693",
      "wall_thickness_mm": "0.356",
      "dead_volume": "144.641 \u00b5L/25.4 mm",
      "id": "10-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/10-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "10 gauge needle | 3.404 | 2.693 | 0.356 | 144.641 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "10 RW",
      "outer_diameter_mm": "3.40",
      "inner_diameter_mm": "2.69",
      "wall_thickness_mm": ".356",
      "id": "10-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/10-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "10     RW   3.40   3.38/3.43   .356   2.69     2.64/2.74",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "11 gauge needle",
      "outer_diameter_mm": "3.048",
      "inner_diameter_mm": "2.388",
      "wall_thickness_mm": "0.33",
      "dead_volume": "113.728 \u00b5L/25.4 mm",
      "id": "11-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/11-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "11 gauge needle | 3.048 | 2.388 | 0.33 | 113.728 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "11 RW",
      "outer_diameter_mm": "3.05",
      "inner_diameter_mm": "2.39",
      "wall_thickness_mm": ".330",
      "id": "11-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/11-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "11     RW   3.05   3.02/3.07   .330   2.39     2.34/2.44",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "12 gauge needle",
      "outer_diameter_mm": "2.769",
      "inner_diameter_mm": "2.159",
      "wall_thickness_mm": "0.305",
      "dead_volume": "93 \u00b5L/25.4 mm",
      "id": "12-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/12-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "12 gauge needle | 2.769 | 2.159 | 0.305 | 93 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "12 RW",
      "outer_diameter_mm": "2.77",
      "inner_diameter_mm": "2.16",
      "wall_thickness_mm": ".305",
      "id": "12-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/12-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "12     RW   2.77   2.74/2.79   .305   2.16     2.11/2.21",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "13 gauge needle",
      "outer_diameter_mm": "2.413",
      "inner_diameter_mm": "1.804",
      "wall_thickness_mm": "0.305",
      "dead_volume": "64.895 \u00b5L/25.4 mm",
      "id": "13-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/13-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "13 gauge needle | 2.413 | 1.804 | 0.305 | 64.895 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "13 RW",
      "outer_diameter_mm": "2.41",
      "inner_diameter_mm": "1.80",
      "wall_thickness_mm": ".305",
      "id": "13-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/13-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "13     RW   2.41   2.39/2.44   .305   1.80     1.75/1.85",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "14 gauge needle",
      "outer_diameter_mm": "2.109",
      "inner_diameter_mm": "1.6",
      "wall_thickness_mm": "0.254",
      "dead_volume": "51.076 \u00b5L/25.4 mm",
      "id": "14-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/14-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "14 gauge needle | 2.109 | 1.6 | 0.254 | 51.076 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "14 RW",
      "outer_diameter_mm": "2.11",
      "inner_diameter_mm": "1.60",
      "wall_thickness_mm": ".254",
      "id": "14-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/14-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "14     RW   2.11   2.08/2.13   .254   1.60     1.55/1.65",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "15 gauge needle",
      "outer_diameter_mm": "1.829",
      "inner_diameter_mm": "1.372",
      "wall_thickness_mm": "0.229",
      "dead_volume": "37.529 \u00b5L/25.4 mm",
      "id": "15-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/15-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "15 gauge needle | 1.829 | 1.372 | 0.229 | 37.529 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "15 RW",
      "outer_diameter_mm": "1.83",
      "inner_diameter_mm": "1.37",
      "wall_thickness_mm": ".229",
      "id": "15-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/15-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "15     RW   1.83   1.82/1.84   .229   1.37     1.33/1.41",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "16 gauge needle",
      "outer_diameter_mm": "1.651",
      "inner_diameter_mm": "1.194",
      "wall_thickness_mm": "0.229",
      "dead_volume": "28.444 \u00b5L/25.4 mm",
      "id": "16-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/16-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "16 gauge needle | 1.651 | 1.194 | 0.229 | 28.444 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "16 RW",
      "outer_diameter_mm": "1.65",
      "inner_diameter_mm": "1.19",
      "wall_thickness_mm": ".229",
      "id": "16-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/16-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "16     RW   1.65   1.64/1.66   .229   1.19     1.16/1.23",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "17 gauge needle",
      "outer_diameter_mm": "1.473",
      "inner_diameter_mm": "1.067",
      "wall_thickness_mm": "0.203",
      "dead_volume": "22.715 \u00b5L/25.4 mm",
      "id": "17-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/17-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "17 gauge needle | 1.473 | 1.067 | 0.203 | 22.715 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "17 RW",
      "outer_diameter_mm": "1.47",
      "inner_diameter_mm": "1.07",
      "wall_thickness_mm": ".203",
      "id": "17-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/17-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "17     RW   1.47   1.46/1.49   .203   1.07     1.03/1.10",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "18 gauge needle",
      "outer_diameter_mm": "1.27",
      "inner_diameter_mm": "0.838",
      "wall_thickness_mm": "0.216",
      "dead_volume": "14.011 \u00b5L/25.4 mm",
      "id": "18-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/18-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "18 gauge needle | 1.27 | 0.838 | 0.216 | 14.011 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "18 RW",
      "outer_diameter_mm": "1.27",
      "inner_diameter_mm": "0.84",
      "wall_thickness_mm": ".216",
      "id": "18-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/18-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "18     RW   1.27   1.26/1.28   .216   0.84     0.80/0.88",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "19 gauge needle",
      "outer_diameter_mm": "1.067",
      "inner_diameter_mm": "0.686",
      "wall_thickness_mm": "0.191",
      "dead_volume": "9.389 \u00b5L/25.4 mm",
      "id": "19-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/19-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "19 gauge needle | 1.067 | 0.686 | 0.191 | 9.389 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "19 RW",
      "outer_diameter_mm": "1.07",
      "inner_diameter_mm": "0.69",
      "wall_thickness_mm": ".191",
      "id": "19-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/19-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "19     RW   1.07   1.05/1.08   .191   0.69   0.65/0.72",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "20 gauge needle",
      "outer_diameter_mm": "0.908",
      "inner_diameter_mm": "0.603",
      "wall_thickness_mm": "0.152",
      "dead_volume": "7.255 \u00b5L/25.4 mm",
      "id": "20-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/20-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "20 gauge needle | 0.908 | 0.603 | 0.152 | 7.255 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "20 RW",
      "outer_diameter_mm": "0.91",
      "inner_diameter_mm": "0.61",
      "wall_thickness_mm": ".152",
      "id": "20-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/20-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "20     RW   0.91   0.90/0.91   .152   0.61   0.58/0.62",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "21 gauge needle",
      "outer_diameter_mm": "0.819",
      "inner_diameter_mm": "0.514",
      "wall_thickness_mm": "0.152",
      "dead_volume": "5.271 \u00b5L/25.4 mm",
      "id": "21-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/21-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "21 gauge needle | 0.819 | 0.514 | 0.152 | 5.271 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "21 RW",
      "outer_diameter_mm": "0.81",
      "inner_diameter_mm": "0.51",
      "wall_thickness_mm": ".152",
      "id": "21-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/21-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "21     RW   0.81   0.81/0.83   .152   0.51   0.50/0.53",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "22 gauge needle",
      "outer_diameter_mm": "0.718",
      "inner_diameter_mm": "0.413",
      "wall_thickness_mm": "0.152",
      "dead_volume": "3.403 \u00b5L/25.4 mm",
      "id": "22-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/22-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "22 gauge needle | 0.718 | 0.413 | 0.152 | 3.403 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "22 RW",
      "outer_diameter_mm": "0.71",
      "inner_diameter_mm": "0.41",
      "wall_thickness_mm": ".152",
      "id": "22-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/22-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "22     RW   0.71   0.71/0.72   .152   0.41   0.39/0.43",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "22s gauge needle",
      "outer_diameter_mm": "0.718",
      "inner_diameter_mm": "0.152",
      "wall_thickness_mm": "0.279",
      "id": "22s-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/22s-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "22s gauge needle | 0.718 | 0.152 | 0.279",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "23 gauge needle",
      "outer_diameter_mm": "0.642",
      "inner_diameter_mm": "0.337",
      "wall_thickness_mm": "0.152",
      "dead_volume": "2.266 \u00b5L/25.4 mm",
      "id": "23-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/23-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "23 gauge needle | 0.642 | 0.337 | 0.152 | 2.266 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "23 RW",
      "outer_diameter_mm": "0.64",
      "inner_diameter_mm": "0.33",
      "wall_thickness_mm": ".152",
      "id": "23-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/23-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "23     RW   0.64   0.64/0.65   .152   0.33   0.32/0.36",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "23s gauge needle",
      "outer_diameter_mm": "0.642",
      "inner_diameter_mm": "0.116",
      "wall_thickness_mm": "0.267",
      "dead_volume": "0.268 \u00b5L/25.4 mm",
      "id": "23s-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/23s-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "23s gauge needle | 0.642 | 0.116 | 0.267 | 0.268 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "24 gauge needle",
      "outer_diameter_mm": "0.566",
      "inner_diameter_mm": "0.311",
      "wall_thickness_mm": "0.127",
      "dead_volume": "1.93 \u00b5L/25.4 mm",
      "id": "24-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/24-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "24 gauge needle | 0.566 | 0.311 | 0.127 | 1.93 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "24 RW",
      "outer_diameter_mm": "0.56",
      "inner_diameter_mm": "0.31",
      "wall_thickness_mm": ".127",
      "id": "24-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/24-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "24     RW   0.56   0.56/0.57   .127   0.31   0.29/0.33",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "25 gauge needle",
      "outer_diameter_mm": "0.515",
      "inner_diameter_mm": "0.26",
      "wall_thickness_mm": "0.127",
      "dead_volume": "1.349 \u00b5L/25.4 mm",
      "id": "25-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/25-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "25 gauge needle | 0.515 | 0.26 | 0.127 | 1.349 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "25 RW",
      "outer_diameter_mm": "0.51",
      "inner_diameter_mm": "0.25",
      "wall_thickness_mm": ".127",
      "id": "25-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/25-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "25     RW   0.51   0.51/0.52   .127   0.25   0.24/0.28",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "25s gauge needle",
      "outer_diameter_mm": "0.515",
      "inner_diameter_mm": "0.153",
      "wall_thickness_mm": "0.178",
      "dead_volume": "0.464 \u00b5L/25.4 mm",
      "id": "25s-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/25s-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "25s gauge needle | 0.515 | 0.153 | 0.178 | 0.464 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "26 gauge needle",
      "outer_diameter_mm": "0.464",
      "inner_diameter_mm": "0.26",
      "wall_thickness_mm": "0.102",
      "dead_volume": "1.349 \u00b5L/25.4 mm",
      "id": "26-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/26-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "26 gauge needle | 0.464 | 0.26 | 0.102 | 1.349 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "26 RW",
      "outer_diameter_mm": "0.46",
      "inner_diameter_mm": "0.25",
      "wall_thickness_mm": ".102",
      "id": "26-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/26-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "26     RW   0.46   0.46/0.47   .102   0.25   0.24/0.28",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "26s gauge needle",
      "outer_diameter_mm": "0.474",
      "inner_diameter_mm": "0.127",
      "wall_thickness_mm": "0.178",
      "dead_volume": "0.322 \u00b5L/25.4 mm",
      "id": "26s-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/26s-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "26s gauge needle | 0.474 | 0.127 | 0.178 | 0.322 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "27 gauge needle",
      "outer_diameter_mm": "0.413",
      "inner_diameter_mm": "0.21",
      "wall_thickness_mm": "0.102",
      "dead_volume": "0.876 \u00b5L/25.4 mm",
      "id": "27-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/27-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "27 gauge needle | 0.413 | 0.21 | 0.102 | 0.876 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "27 RW",
      "outer_diameter_mm": "0.41",
      "inner_diameter_mm": "0.20",
      "wall_thickness_mm": ".102",
      "id": "27-rw",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/27-rw/",
      "source": "https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf",
      "source_quote": "27     RW   0.41   0.41/0.42   .102   0.20   0.19/0.23",
      "verified_fields": [
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "28 gauge needle",
      "outer_diameter_mm": "0.362",
      "inner_diameter_mm": "0.184",
      "wall_thickness_mm": "0.089",
      "dead_volume": "0.675 \u00b5L/25.4 mm",
      "id": "28-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/28-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "28 gauge needle | 0.362 | 0.184 | 0.089 | 0.675 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "29 gauge needle",
      "outer_diameter_mm": "0.337",
      "inner_diameter_mm": "0.184",
      "wall_thickness_mm": "0.076",
      "dead_volume": "0.675 \u00b5L/25.4mm",
      "id": "29-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/29-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "29 gauge needle | 0.337 | 0.184 | 0.076 | 0.675 \u00b5L/25.4mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "30 gauge needle",
      "outer_diameter_mm": "0.312",
      "inner_diameter_mm": "0.159",
      "wall_thickness_mm": "0.076",
      "dead_volume": "0.504 \u00b5L/25.4 mm",
      "id": "30-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/30-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "30 gauge needle | 0.312 | 0.159 | 0.076 | 0.504 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "31 gauge needle",
      "outer_diameter_mm": "0.261",
      "inner_diameter_mm": "0.133",
      "wall_thickness_mm": "0.064",
      "dead_volume": "0.353 \u00b5L/25.4 mm",
      "id": "31-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/31-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "31 gauge needle | 0.261 | 0.133 | 0.064 | 0.353 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "32 gauge needle",
      "outer_diameter_mm": "0.235",
      "inner_diameter_mm": "0.108",
      "wall_thickness_mm": "0.064",
      "dead_volume": "0.233 \u00b5L/25.4 mm",
      "id": "32-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/32-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "32 gauge needle | 0.235 | 0.108 | 0.064 | 0.233 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "33 gauge needle",
      "outer_diameter_mm": "0.21",
      "inner_diameter_mm": "0.108",
      "wall_thickness_mm": "0.051",
      "dead_volume": "0.233 \u00b5L/25.4 mm",
      "id": "33-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/33-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "33 gauge needle | 0.21 | 0.108 | 0.051 | 0.233 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    },
    {
      "gauge_number": "34 gauge needle",
      "outer_diameter_mm": "0.159",
      "inner_diameter_mm": "0.051",
      "wall_thickness_mm": "0.051",
      "dead_volume": "0.052 \u00b5L/25.4 mm",
      "id": "34-gauge-needle",
      "url": "https://referencesource.org/syringe-needle-gauge-dimensions/34-gauge-needle/",
      "source": "https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart",
      "source_quote": "34 gauge needle | 0.159 | 0.051 | 0.051 | 0.052 \u00b5L/25.4 mm",
      "verified_fields": [
        "dead_volume",
        "gauge_number",
        "inner_diameter_mm",
        "outer_diameter_mm",
        "wall_thickness_mm"
      ]
    }
  ]
}