# RF bulkhead connectors BNC, N, TNC, F: IEC 61169 parts, thread, hex, panel thickness and mounting hole (as printed per drawing)

> What size hole does a BNC, N, TNC or F bulkhead connector need, and what thread does each use?

- Category: Electronic components › Connectors
- Kind: Standard part
- Basis: Maker and distributor-hosted drawings for specific parts (Amphenol RF, TE, Pasternack, Fairview, e-sonic, Farnell-hosted, Cmpter) and the IEC 61169 titles; numbers only, no files
- Page: https://xemstudio.com/objects/rf-bulkhead-connectors-bnc-n-tnc-f/ · JSON: https://xemstudio.com/api/geometry?object=rf-bulkhead-connectors-bnc-n-tnc-f · Plain text: https://xemstudio.com/objects/rf-bulkhead-connectors-bnc-n-tnc-f/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- There is no single panel hole for a connector type: each drawing prints its own 'recommended mounting hole', and parts of the same type differ (a front-mount BNC with a 3/8-32 thread, a 1/2-28 sealed BNC, a PCB right-angle BNC). Every row is one drawing, with its numbers as printed. Use the drawing of the part you buy; the rows show the spread, they are not a standard.
- IEC 61169 parts (titles read): Part 8 BNC, inner diameter of outer conductor 6,5 mm (0,256 in), bayonet lock, 50 ohm; Part 16 type N, 7 mm (0,276 in), screw coupling, 50 ohms (75 ohms); Part 17 type TNC, screw coupling, 50 ohm; Part 24 type F, screw coupling, 75 ohm cable networks. SMA is on sma-bulkhead-connector (1/4-36 UNS) and U.FL on u-fl-connector.
- Threads printed on the drawings read: N 5/8-24 UNEF-2A, TNC 7/16-28 UNEF-2A (one TNC drawing prints 7/16-28 and 1/2-28 without saying which is which), F 3/8-32 UNEF-2A. A BNC couples by bayonet and has no coupling thread; the 3/8-32 and 1/2-28 threads in the BNC rows belong to the bulkhead body.
- Disagreements kept: the RP-TNC mounting hole is .480 in (12.19 mm) in the Pasternack product name and .476 +.005/-.000 in (12.09 mm) on its drawing; a TNC with a different drawing prints Ø11.43, another 11.80 REF. The two Amphenol/Cmpter BNC drawings both show a .382 in (9.70 mm) figure, the one value that appears twice for BNC.
- IEC 61169-24 sample pages (female socket, Table 1): port minimum full thread length 7.50 mm, thread relief not to exceed two full threads, reference plane opening inner diameter 3.90 to 7.4 mm, outer diameter 7.50 to 8.50 mm; male plug (Table 2): length of nut 4.00 to 7.29 mm, inner conductor length 6.35 to 8.63 mm, seal-ring surface diameter 10.41 to 11.04 mm. The sample prints no thread diameter or pitch.
- Several drawings label a recommended hole with no value in the text layer (the numbers sit in the drawing image), so those cells say so and nothing is guessed. No file: the D-flat width is not readable as a labelled number on any drawing, so no hole gauge is drawn.

## Sizes

| connector (IEC 61169 part) | part as the drawing names it | thread(s) printed | hex / wrench / flats | max panel | mounting hole as printed | source |
|---|---|---|---|---|---|---|
| BNC (IEC 61169-8, bayonet, 50 ohm) | Amphenol RF 31-3376 straight front-mount bulkhead jack (MIL-C-39012/21-0002) | 3/8-32 NEF-2A | 1/2 in hex (12.70 mm) | 0.245 in (6.22 mm) | 'D' flat. Dimension list also prints 0.382 ±0.002 in (9.70 ±0.05 mm) and 0.348 +0.002/-0.001 in (8.84 +0.05/-0.03 mm); the text read does not tie them to the hole | Amphenol RF drawing via TestEquity |
| BNC (IEC 61169-8) | Cmpter drawing 10-02-8A1-027 Rev C: straight bulkhead female, solder end | 3/8-32 UNEF-2A | SW 12.7 (.500 hex) | 3.5 mm (.138 in), most likely reading of an ambiguous layout | Ø9.7 mm (.382 dia), under 'Recommended mounting hole'; layout ambiguous in the text read | Cmpter drawing |
| BNC (IEC 61169-8) | sealed bulkhead jack for RG-174 / RG316 (e-sonic 112517-10) | 1/2-28 UNEF-2A | 15.88 hex (5/8 in); 17.45 on flats; 11.79 'on the flat' | not stated | label 'Recommended mounting hole' with no readable value | e-sonic drawing |
| BNC (IEC 61169-8) | Amphenol RF 31-5486-10RFX right-angle PC-mount receptacle jack | 1/2-28 UNEF | 9/16 hex | 5 mm (.197 in) | section 'Recommended mounting hole dimensions' with no readable value | Amphenol RF via Mouser |
| N (IEC 61169-16, screw, 7 mm, 50 / 75 ohm) | N-type straight jack (Farnell-hosted drawing 3933910) | 5/8-24 UNEF-2A | 19 hex | 6.5 mm max | Ø16.1 recommended panel cutout; '13.45 on flats'. An unlabeled 13.7 is also printed in the cutout section | Farnell drawing 3933910 |
| TNC (IEC 61169-17, screw, 50 ohm) | TNC straight bulkhead jack, front mount, IP 67 (Farnell-hosted drawing 3931294) | 7/16-28 UNEF-2A and 1/2-28 UNEF-2A (the text does not say which is the panel thread) | 11/16 in and 16.00 mm wrench | 4.20 mm (0.165 in) | 'D' flat; 11.80 REF (0.465 in); the text read does not label it | Farnell drawing 3931294 |
| TNC (IEC 61169-17) | TE Connectivity 2503832-1 TNC female | 7/16-28 UNEF-2A | 14.0 hex; 10.33 flat (5 holes) | 2.37 max (unit not printed) | Ø11.43 under 'Recommended mounting hole dimensions' (unit not printed; 11.43 mm = 0.450 in) | TE drawing |
| RP-TNC (reverse-polarity TNC) | Pasternack RP-TNC female bulkhead, crimp / solder, RG58 | 1/2-28 UNEF and 7/16-28 UNEF both printed (role not labeled) | .630 in (16.00 mm) hex; 11/16 hex with 15/32 flat | .134 in (3.40 mm) | product name says '.480 inch D Hole' (12.19 mm); drawing prints .476 +.005/-.000 in (12.09 +0.13/-0.00 mm); note says 'for reference only'. Both shown | Pasternack drawing |
| F (IEC 61169-24, screw, 75 ohm) | Fairview Microwave FMCN44212 F female bulkhead | 3/8-32 UNEF-2A | 7/16 hex | .079 in (2.00 mm) | .380 +.005/-.000 in (9.65 +0.13/0.00 mm), labeled 'Recommended mounting hole' | Fairview drawing |

## Where the files are

- Amphenol RF (via TestEquity): [BNC straight bulkhead jack, front mount, drawing 31-3376 (MIL-C-39012/21-0002): thread 3/8-32 NEF-2A, 1/2 in hex, max panel 0.245 in](https://assets.testequity.com/te1/Documents/pdf/amphenol/amphenol_031-336-rfx-connector_customer-drawing.pdf) — web — Publisher's page; dimensions are facts
- Cmpter (BNC drawing 10-02-8A1-027 Rev C): [BNC straight bulkhead female, solder end: 3/8-32 UNEF-2A, SW 12.7, recommended mounting hole](https://www.cmpter.com/uploadfile/rf-connector/BNC/10-02-8A1-027(REV.C).pdf) — web — Publisher's page; dimensions are facts
- e-sonic (maker drawing 112517-10): [BNC jack, sealed bulkhead for RG-174 / RG316: 1/2-28 UNEF-2A, 15.88 hex, 17.45 on flats](https://www.e-sonic.com/upload/parts/datasheets/mf-ah/112517-10.pdf) — web — Publisher's page; dimensions are facts
- Amphenol RF (via Mouser): [BNC right-angle PC mount receptacle jack 31-5486-10RFX: 1/2-28 UNEF, 9/16 hex, max panel 5 mm](https://www.mouser.com/datasheet/2/18/1/c031_5486_10rfx-2308708.pdf) — web — Publisher's page; dimensions are facts
- Farnell (hosted drawing 3933910): [N-type straight jack: 5/8-24 UNEF-2A, 19 hex, panel 6.5 mm max, recommended panel cutout](https://farnell.com/cad/3933910.pdf) — web — Publisher's page; dimensions are facts
- Farnell (hosted drawing 3931294): [TNC straight bulkhead jack, front mount, IP 67: 7/16-28 and 1/2-28 UNEF-2A, panel 4.20 mm max](https://www.farnell.com/cad/3931294.pdf) — web — Publisher's page; dimensions are facts
- TE Connectivity (drawing 2503832-1): [TNC female: 7/16-28UNEF-2A, 14.0 hex, recommended mounting hole](https://sigma.octopart.com/188938539/technical_drawing/TE-Connectivity-2503832-1.pdf) — web — Publisher's page; dimensions are facts
- Pasternack (drawing PE4696): [RP-TNC female bulkhead, crimp / solder, RG58, ".480 inch D hole"](https://static.dajiqun.com/product-medias/coaxial-connector-rf-assemblies/pasternack/PE4696/20372459-19133871.pdf) — web — Publisher's page; dimensions are facts
- Fairview Microwave: [FMCN44212 F female bulkhead (75 ohm): 3/8-32 UNEF-2A, 7/16 hex, recommended mounting hole .380 in](https://www.fairviewmicrowave.com/content/dam/infinite-electronics/product-assets/fairview-microwave/2d-drawings/FMCN44212_2D.PDF) — web — Publisher's page; dimensions are facts
- iTeh Standards (IEC): [IEC 61169-8:2007 Part 8: RF coaxial connectors with inner diameter of outer conductor 6,5 mm (0,256 in) with bayonet lock, 50 ohm (type BNC)](https://standards.iteh.ai/catalog/standards/iec/a59beddf-7070-48bc-aed3-9c0e38aafcd9/iec-61169-8-2007) — web — Publisher's page; dimensions are facts
- IEC webstore: [IEC 61169-16:2006 Part 16: RF coaxial connectors with inner diameter of outer conductor 7 mm (0,276 in) with screw coupling, 50 ohms (75 ohms) (type N)](https://webstore.iec.ch/publication/4727) — web — Publisher's page; dimensions are facts
- IEC webstore: [IEC 61169-17:2022 Part 17: sectional specification for RF coaxial connectors, screw coupling, 50 ohm, type TNC (full title not shown in the text read)](https://webstore.iec.ch/publication/67903) — web — Publisher's page; dimensions are facts
- iTeh Standards (IEC): [IEC 61169-24 sample pages: RF coaxial connectors with screw coupling, 75 ohm cable networks (type F); interface tables 1 and 2](https://cdn.standards.iteh.ai/samples/101346/e258bbe37f7a4e399ce9c66ca4f78693/IEC-61169-24-2019.pdf) — web — Publisher's page; dimensions are facts

## Questions

**What thread does a BNC bulkhead jack have?**

On the drawings read it is 3/8-32 UNEF-2A (Amphenol RF 31-3376, a Cmpter BNC) or 1/2-28 UNEF (a sealed BNC and a PCB right-angle jack). The plug side couples by bayonet.

**What hole for an F connector bulkhead?**

Fairview's FMCN44212 drawing prints a recommended mounting hole of .380 +.005/-.000 in (9.65 +0.13/0.00 mm) for a 3/8-32 UNEF-2A thread, 7/16 hex, panel up to 2.00 mm.

**What is the N connector thread?**

5/8-24 UNEF-2A on the drawing read, with a 19 mm hex, panel up to 6.5 mm and a recommended Ø16.1 cutout.

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