SMA and RP-SMA bulkhead jack: thread and D-flat panel cutout — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/sma-bulkhead-connector/  (sheet CC BY 4.0)
Basis: Maker drawings (Samtec, Amphenol RF)
Catalog version: 2026-10-20

Sizes: see table below
- 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.

dimension  value
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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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
- 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

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=sma-bulkhead-connector