# Neutrik D-size XLR and speakON panel cutouts: Ø24 mm hole, 19 x 24 mm screw holes, NL2MP / NL4MP / NL8MPR + cutout gauge

> What size hole does a Neutrik XLR chassis connector or speakON NL4MP need?

- Category: Electronic components › Panel cutouts
- Kind: Standard part
- Basis: Neutrik NL2MP / NL4MP / NL8MPR sheets (two copies that disagree on the main hole), distributor listings of the NC3FD-L-1, the NJ3FP6C datasheet and an Amplified Parts listing of the Switchcraft 112BX; one gauge file
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- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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## Overall (mm)

| length | width | height |
|---|---|---|
| 40.0 | 40.0 | 3.0 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- The Neutrik NC3FD-L-1 distributor listings print a 'Standardized D sized 24 mm panel cutout'. speakON NL2MP and NL4MP are D-shaped chassis parts: their sheets print 19.0 and 24.0 with ±0.1 mm, a main hole of at least Ø23.8 or Ø24.0, and a Ø3.2 minimum screw hole.
- Disagreement kept: the main hole of the NL2MP / NL4MP is '>= Ø23.8' on the IEWC copy of the sheet and '>= Ø24.0 (.945 in)' on the Farnell copy. The gauge uses Ø24.0, the D-size nominal; open it by your process clearance on either reading.
- The two numbers 19.0 and 24.0 are the spacing of the two screw holes. The text read does not say which is horizontal; the file puts the two Ø3.2 holes on the diagonal of that 19 x 24 rectangle, as on the D-series drawing summarised on panel-cutouts. Check your connector's drawing before cutting a one-off panel.
- NL8MPR (8-pole) prints a different set: >= Ø31.0, 29.2 and >= Ø3.5, not a D-size cutout.
- 1/4 in and 3.5 mm jacks: the Neutrik NJ3FP6C datasheet text says only 'dimensionally compatible with D Series (31 x 26 mm)' (its cut-out is a drawing image); the Switchcraft 112BX listing gives panel thickness 0.156 in, bushing ID 0.25 in and 3/8-32 UNEF-2A nuts but no mounting hole. A Switchcraft 3.5 mm jack (35RAPC4BH3) and the CUI SJ1-352xN sheets read give only PC-board layouts, no panel hole. No 1/4 in or 3.5 mm panel hole is tabulated for that reason.
- Maker CAD: Neutrik publishes drawings and STEP for each chassis connector on its product pages (linked, not copied).

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| panel hole 24 mm (file neutrik-d-size-panel-cutout-gauge-24mm) | round hole Ø24.0 mm, the D-size cutout (NL2MP / NL4MP sheets print >= Ø23.8 or >= Ø24.0) | Neutrik D-series XLR chassis connector body (NC3FD, NC3MD, NC4MD) and speakON NL2MP / NL4MP chassis | slide | neutrik-d-size-panel-cutout-gauge* |
| two screw holes Ø3.2 on a 19.0 x 24.0 rectangle (file neutrik-d-size-panel-cutout-gauge-24mm) | Ø3.2 min, spacing 19.0 and 24.0 mm (±0.1), placed on the diagonal | M3 or 4-40 machine screws through the connector flange (countersunk through holes per the NL4MP sheet) | slide | neutrik-d-size-panel-cutout-gauge* |

## Sizes

| part / family | main hole as printed | screw holes / spacing as printed | other as printed | source |
|---|---|---|---|---|
| Neutrik D-series XLR chassis (e.g. NC3FD-L-1, 3-pole female) | 'Standardized D sized 24 mm panel cutout' | not in the listing text (see the gauge file and panel-cutouts) | 16 A per contact, rated under 50 V (distributor listing) | e-sonic, Buerklin listings |
| speakON NL2MP / NL4MP chassis (IEWC-hosted sheet) | >= Ø23.8 mm | 19.0 and 24.0 printed (tolerance ±0.1 mm); >= Ø3.2 (±0.1) | contacts for 3/16 in FASTON tabs 4.8 x 0.5 mm; not for AC mains | Neutrik sheet NL4MP-B |
| speakON NL2MP / NL4MP chassis (Farnell-hosted sheet) | >= Ø24.0 mm (.945 in) | 19.0 ±0.1 mm (.748 ±.003 in); >= Ø3.2 mm (.126 in) | countersunk through holes for M3 or 4-40 machine screws; self-tapping holes for the Neutrik A-screw (NL4MPXX-3, rear mount only) | Neutrik sheet 3163567 |
| speakON NL8MPR chassis (IEWC-hosted sheet) | >= Ø31.0 mm | 29.2 printed; >= Ø3.5 (±0.1) | pole count not stated in the text read | Neutrik sheet NL4MP-B |
| speakON NL4MPXX spec sheet (Shopify-hosted) | not stated in the text read | not stated; 'Standard Hole Position, Thru Holes' in the text, no values | 25 A rms continuous per contact (audio ratings higher), 4-pole, D-shaped chassis | Neutrik NL4MPXX spec sheet |
| Neutrik NJ3FP6C 1/4 in (6.35 mm) panel jack | cut-out is in a drawing image | not in the text read | 'dimensionally compatible with D Series (31 x 26 mm)' | Neutrik NJ3FP6C datasheet |
| Switchcraft 112BX 1/4 in stereo jack | mounting hole not listed | — | panel thickness 0.156 in; bushing ID 0.25 in, length 0.276 in; nuts 3/8-32 UNEF-2A | Amplified Parts listing |

## Where the files are

- e-sonic (Neutrik NC3FD-L-1 listing): [Neutrik NC3FD-L-1 3-pole female XLR chassis, 'Standardized D sized 24 mm panel cutout'; 16 A per contact, under 50 V](https://www.e-sonic.com/en/neutrik/nc3fdl1-11966688.html) — web — Publisher's page; dimensions are facts
- Buerklin (Neutrik NC3FD-L-1 listing): [Neutrik NC3FD-L-1: panel cutout 24 mm](https://www.buerklin.com/en/p/neutrik/xlr-connectors/nc3fd-l-1/70F1880/?view=GRID) — web — Publisher's page; dimensions are facts
- Neutrik (Farnell-hosted sheet 3163567): [speakON NL2MP / NL4MP chassis connector: panel cutout, countersunk through holes for M3 or 4-40, self-tapping holes for the Neutrik A-screw](https://www.farnell.com/datasheets/3163567.pdf) — web — Publisher's page; dimensions are facts
- Neutrik (IEWC-hosted sheet NL4MP-B): [speakON NL2MP / NL4MP and NL8MPR: panel cutout table (>= Ø23.8 / 19.0 / 24.0 / >= Ø3.2; NL8MPR >= Ø31.0 / 29.2 / >= Ø3.5)](https://media.iewc.com/SpecificationSheets/NL4MP-B.pdf) — web — Publisher's page; dimensions are facts
- Neutrik (Shopify-hosted spec sheet NL4MPXX): [speakON NL4MPXX: 25 A rms continuous per contact, 4-pole, D-shape chassis](https://cdn.shopify.com/s/files/1/0628/4404/3505/files/NT-NL4MPXX_spec_sheet.pdf) — web — Publisher's page; dimensions are facts
- Neutrik (datasheets.com copy): [NJ3FP6C 1/4 in jack, panel: 'dimensionally compatible with D Series (31 x 26 mm)'](https://static.datasheets.com/doc/3122225-neutrik-nj3fp6c-b-ds.pdf) — web — Publisher's page; dimensions are facts
- Amplified Parts (Switchcraft 112BX listing): [Switchcraft 112BX: panel thickness 0.156 in, bushing ID 0.25 in, bushing length 0.276 in, nuts 3/8-32 UNEF-2A](https://www.amplifiedparts.com/node/45669) — web — Publisher's page; dimensions are facts
- Neutrik: [Neutrik XLR chassis connectors: product pages with drawings and STEP (account-free download on the maker's site)](https://www.neutrik.com/en/products/audio/xlr/xlr-chassis-connectors) — STEP, PDF — Neutrik site terms (verify at link)

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/neutrik-d-size-xlr-speakon-panel-cutouts/index.json

- neutrik-d-size-panel-cutout-gauge-24mm: [STEP](https://xemstudio.com/files/hardware/neutrik-d-size-xlr-speakon-panel-cutouts/neutrik-d-size-panel-cutout-gauge-24mm.step) · [STL](https://xemstudio.com/files/hardware/neutrik-d-size-xlr-speakon-panel-cutouts/neutrik-d-size-panel-cutout-gauge-24mm.stl) — panel-cutout gauge plate, 40 x 40 x 3 mm: centre hole Ø24.0 (the D-size cutout) and two Ø3.2 screw holes at (-9.5, +12.0) and (+9.5, -12.0) mm, i.e. on the diagonal of the 19 x 24 rectangle (NL2MP / NL4MP sheets print 19.0 and 24.0 and a Ø3.2 minimum screw hole; the diagonal placement follows the Neutrik D-series drawing summarised on panel-cutouts); plate size, thickness and corner radius are Xem choices

## Questions

**What size hole for an XLR chassis connector?**

Neutrik's NC3FD-L-1 listings print a 'D sized 24 mm panel cutout'. The NL4MP speakON sheets print >= Ø23.8 or >= Ø24.0 depending on the copy.

**How far apart are the screw holes of a Neutrik D-series connector?**

The NL2MP / NL4MP sheets print 19.0 and 24.0 mm (±0.1) with a Ø3.2 minimum screw hole; the file draws the two holes on the diagonal of that 19 x 24 rectangle.

**What screws fit a speakON NL4MP?**

Countersunk through holes for M3 or 4-40 machine screws, or self-tapping holes for the Neutrik A-screw on the NL4MPXX-3 (rear mount only).

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