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SMA and RP-SMA bulkhead jack: thread and D-flat panel cutout

What size hole does an SMA bulkhead connector need? · Standard part · basis: Maker drawings (Samtec, Amphenol RF)

Also called: sma bulkhead hole size, sma panel cutout, rp-sma bulkhead dimensions, sma thread size, 1/4-36 uns, fpv antenna mount

Exact dimensions. True size, with no printing tolerance added.

sizes
5 in table

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.

SMA and RP-SMA bulkhead jack: thread and D-flat panel cutout size chart

dimensionvalue
coupling thread1/4-36 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 cutoutsame 6.60 / 6.10 pair, one 'D' flat

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

SamtecSMA-J-C-X-ST-BH4 bulkhead jack drawing (recommended panel cutout)webPublisher's page; dimensions are facts
Amphenol RF (via TestEquity)SMA straight bulkhead jack, front mount, customer drawing 132397webPublisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

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Plain text: sheet.txt · JSON: /api/geometry?object=sma-bulkhead-connector

opening
Schematic, not to scale.

Fits with

opening
U.FL (IPEX MHF1 type) connector: mated heights and cable sizes6 sizes★ sheet
Panel cutouts: IEC inlet, rockers, barrel jack, USB-C, HDMI, LEDs, Neutrik D, isometric render of a generated part
Panel cutouts: IEC inlet, rockers, barrel jack, USB-C, HDMI, LEDs, Neutrik D11 sizes★ 10 files
FPV camera sizes (nano 14, micro 19, mini 22, full 28 mm) and DJI O3 / O4 air unit dimensions, isometric render of a generated part
FPV camera sizes (nano 14, micro 19, mini 22, full 28 mm) and DJI O3 / O4 air unit dimensions8 sizes★ 5 files

Questions

What thread is SMA?

1/4-36 UNS (2A on the jack, 2B in the nut).

What hole does an SMA bulkhead need?

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.