{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "sma-bulkhead-connector",
 "name": "SMA and RP-SMA bulkhead jack: thread and D-flat panel cutout",
 "kind": "standard",
 "category": "Electronic components",
 "group": "Connectors",
 "year": null,
 "question": "What size hole does an SMA bulkhead connector need?",
 "tags": [
  "sma",
  "rp-sma",
  "antenna",
  "fpv",
  "connector",
  "panel cutout"
 ],
 "aliases": [
  "sma bulkhead hole size",
  "sma panel cutout",
  "rp-sma bulkhead dimensions",
  "sma thread size",
  "1/4-36 uns",
  "fpv antenna mount"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/sma-bulkhead-connector/",
 "sheet_txt": "https://xemstudio.com/objects/sma-bulkhead-connector/sheet.txt",
 "sheet": {
  "basis": "Maker drawings (Samtec, Amphenol RF)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "FPV antennas and VTX pigtails pass through a frame or canopy on an SMA (or RP-SMA, same body and thread, reversed pin) bulkhead jack.",
   "Both maker drawings give the recommended mounting hole as a 6.60 mm (.260 in) hole with one D flat paired with 6.10 mm (.240 in); the text of the drawings does not label 6.10 explicitly as the flat-to-opposite-edge distance, so no cutout file is drawn from it. Check the drawing of your exact part before cutting.",
   "Panel thickness limits differ by part (3.80 mm max on the Samtec part); long-thread bulkheads take thicker panels.",
   "U.FL pigtails to SMA bulkheads are on the U.FL page."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "coupling thread",
     "1/4-36 UNS-2A (jack) / 1/4-36 UNS-2B (nut), interface MIL-STD-348 series SMA"
    ],
    [
     "recommended panel cutout (Samtec)",
     "6.60 mm (.260 in) round hole and 6.10 mm (.240 in) dimension, with a single D flat"
    ],
    [
     "max panel thickness (Samtec SMA-J-C-X-ST-BH4)",
     "3.80 mm (.150 in)"
    ],
    [
     "hex (Samtec)",
     "8.00 mm (.315 in) REF"
    ],
    [
     "Amphenol RF 132397 cutout",
     "same 6.60 / 6.10 pair, one 'D' flat"
    ]
   ]
  }
 },
 "sheet_text": "SMA and RP-SMA bulkhead jack: thread and D-flat panel cutout — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/sma-bulkhead-connector/  (sheet CC BY 4.0)\nBasis: Maker drawings (Samtec, Amphenol RF)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- FPV antennas and VTX pigtails pass through a frame or canopy on an SMA (or RP-SMA, same body and thread, reversed pin) bulkhead jack.\n- Both maker drawings give the recommended mounting hole as a 6.60 mm (.260 in) hole with one D flat paired with 6.10 mm (.240 in); the text of the drawings does not label 6.10 explicitly as the flat-to-opposite-edge distance, so no cutout file is drawn from it. Check the drawing of your exact part before cutting.\n- Panel thickness limits differ by part (3.80 mm max on the Samtec part); long-thread bulkheads take thicker panels.\n- U.FL pigtails to SMA bulkheads are on the U.FL page.\n\ndimension  value\ncoupling thread  1/4-36 UNS-2A (jack) / 1/4-36 UNS-2B (nut), interface MIL-STD-348 series SMA\nrecommended panel cutout (Samtec)  6.60 mm (.260 in) round hole and 6.10 mm (.240 in) dimension, with a single D flat\nmax panel thickness (Samtec SMA-J-C-X-ST-BH4)  3.80 mm (.150 in)\nhex (Samtec)  8.00 mm (.315 in) REF\nAmphenol RF 132397 cutout  same 6.60 / 6.10 pair, one 'D' flat\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Samtec: SMA-J-C-X-ST-BH4 bulkhead jack drawing (recommended panel cutout) — web — Publisher's page; dimensions are facts — https://suddendocs.samtec.com/prints/sma-j-c-x-st-bh4-mkt.pdf\n- Amphenol RF (via TestEquity): SMA straight bulkhead jack, front mount, customer drawing 132397 — web — Publisher's page; dimensions are facts — https://assets.testequity.com/te1/Documents/pdf/amphenol/amphenol_132397-connector_customer-drawing.pdf\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=sma-bulkhead-connector\n",
 "sources": [
  {
   "publisher": "Samtec",
   "title": "SMA-J-C-X-ST-BH4 bulkhead jack drawing (recommended panel cutout)",
   "url": "https://suddendocs.samtec.com/prints/sma-j-c-x-st-bh4-mkt.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Amphenol RF (via TestEquity)",
   "title": "SMA straight bulkhead jack, front mount, customer drawing 132397",
   "url": "https://assets.testequity.com/te1/Documents/pdf/amphenol/amphenol_132397-connector_customer-drawing.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "u-fl-connector",
  "panel-cutouts",
  "fpv-cameras-and-air-units"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "What thread is SMA?",
   "a": "1/4-36 UNS (2A on the jack, 2B in the nut)."
  },
  {
   "q": "What hole does an SMA bulkhead need?",
   "a": "A 6.60 mm (.260 in) hole with one D flat, paired with 6.10 mm (.240 in) on the Samtec and Amphenol drawings; check your part's drawing."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/sma-bulkhead-connector/index.md"
}