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M12 and M8 circular sensor connectors: thread, coding A / B / D / X, pin counts and panel-mount hole sizes (+ hole gauge)

What are the M12 and M8 sensor connector codings, pin counts and standards, and what hole size does an M12 (M16 or PG9) panel-mount receptacle need? · Standard part · basis: HARTING coding table (IEC 61076-2-101 / -104 / -109 / -111 / -113 / -114), Pepperl+Fuchs mounting-hole table from two data sheets, M8Con / IO Connections / CUI sheets for threads; hole gauge file is Xem-drawn

Also called: m12 connector dimensions, m12 panel mount hole size, m12 pg9 hole 15.3, m12 m16 panel cutout, m12 coding chart, m12 a coded pin count, m12 d coded 4 pin, m12 x coded 8 pin, m8 connector thread, m8 sensor connector pinout, iec 61076-2-101, iec 61076-2-104, m12 bulkhead hole diameter, m12 receptacle mounting thread, sensor plug m12x1

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. Mating features

sizes
17 in table

Notes

  • M12 and M8 are the round sensor / actuator connectors on industrial machines. The coupling thread is M12 × 1 (IEC 61076-2-101; Pepperl+Fuchs) or M8 × 1 (IEC 61076-2-104; the M8Con sheet read). The coding is the key pattern that stops mismatched plugs; it is not the pin count, though each coding has typical counts. The coding table is HARTING's (standards and applications) with pin counts as it states them; L-com's overview lists the same letters (A sensors and DC power, B PROFIBUS, D 100 Mbit Ethernet, K and S AC power, L DC power, X 10 Gigabit Ethernet) without standard numbers or pin counts.
  • Panel mounting is a different thread from the coupling thread. The panel-mount (receptacle) body threads read are M16 × 1.5 or PG9 for M12 receptacles (Pepperl+Fuchs; IO Connections lists 'PG9 or M16×1.5'; a CUI D-coded sheet gives M16 × 1.5), M8 × 0.5 for M8, and PG13.5 for larger bodies. Pepperl+Fuchs prints one mounting-hole table on two data sheets (V1-PG9-500 and V1-PG13,5-Y124355): hole Ø M8 × 0.5 8.2, M12 × 1 12.2, M16 × 1.5 16.1, M20 × 1.5 20.1, PG9 15.3, PG13.5 20.5 mm (hole tolerances +0.1 to +0.2 printed; 1 × 45° chamfer). That V1-PG9-500 receptacle tightens at 3 to 4 Nm (locknut not included). The column labels in the extracted text are positional (hole Ø is column B), so confirm on the maker's drawing for your connector.
  • Not in any text read: the wrench size, panel thickness range and the front / rear flange diameter of each connector; the IO Connections and Pepperl+Fuchs drawings carry those as unlabelled picture callouts. M8 mounting-hole values for M8 × 1 receptacles were also not readable (Mouser's M8Con sheet references a drawing only).
  • File: a panel-hole gauge plate with the six Pepperl+Fuchs hole diameters (8.2, 12.2, 15.3, 16.1, 20.1, 20.5) to test-fit a receptacle thread before drilling a panel. Plate size, spacing and thickness are an example; the holes are the maker's.
  • Related: the cable-gland page has the M12 to M63 metric thread panel holes (EN 60423); the panel-cutouts page has other connector cut-outs.

M12 and M8 circular sensor connectors: thread, coding A / B / D / X… size chart

coding / featurethreadstandardpolesusepanel hole Ø, mmsource note
A-coded M8M8 × 1 coupling threadIEC 61076-2-1043 to 12 (HARTING; the A-coded M8 sheet read: 3 and 4 pin)sensor and actuator signals, field-device power
A-coded M12M12 × 1 coupling threadIEC 61076-2-1013 to 12 (4, 5 and 8 on the receptacle pages read)sensor and actuator signals, field-device power
B-coded M12M12 × 1 coupling threadIEC 61076-2-1012, 4 or 5PROFIBUS fieldbus
D-coded M8M8 × 1 coupling threadIEC 61076-2-114not statedindustrial Ethernet up to 100 Mbit/s
D-coded M12M12 × 1 coupling threadIEC 61076-2-1014 (a D-coded receptacle read: 4 positions, pin Ø1 mm)industrial Ethernet up to 100 Mbit/s
K-coded M12M12 × 1 coupling threadIEC 61076-2-1114 + PEpower for small drives
L-coded M12M12 × 1 coupling threadIEC 61076-2-1114 + FEdevice power at high current and voltage
P-coded M8M8 × 1 coupling threadIEC 61076-2-1144EtherCAT P data and power
S-coded M12M12 × 1 coupling threadIEC 61076-2-1113 + PEpower for smaller devices
X-coded M12M12 × 1 coupling threadIEC 61076-2-1098industrial Ethernet up to 10 Gbit/s
Y-coded M12M12 × 1 coupling threadIEC 61076-2-1138hybrid signal and power
mounting hole for a receptacle with M8 × 0.5 body thread8.2Pepperl+Fuchs mounting drawing (hole Ø 'B')
mounting hole for a receptacle with M12 × 1 body thread12.2Pepperl+Fuchs mounting drawing (hole Ø 'B')
mounting hole for a receptacle with PG9 body thread15.3Pepperl+Fuchs mounting drawing (hole Ø 'B')
mounting hole for a receptacle with M16 × 1.5 body thread16.1Pepperl+Fuchs mounting drawing (hole Ø 'B')
mounting hole for a receptacle with M20 × 1.5 body thread20.1Pepperl+Fuchs mounting drawing (hole Ø 'B')
mounting hole for a receptacle with PG13.5 body thread20.5Pepperl+Fuchs mounting drawing (hole Ø 'B')

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

featureexactmates withfitfiles
panel holeØ8.2 (M8×0.5), 12.2 (M12×1), 15.3 (PG9), 16.1 (M16×1.5), 20.1 (M20×1.5), 20.5 (PG13.5)receptacle body thread of that size (maker's drawing governs panel thickness and flange)slidepanel-hole*

Where the files are

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

HARTINGCircular coding: M8 / M12 codings A, B, D, K, L, P, S, X, Y with IEC 61076-2-xxx numbers, pole counts and applicationswebPublisher's page; dimensions are facts
Pepperl+FuchsV1-PG9-500 M12 / PG9 4-pin receptacle: plug thread M12 x 1 per IEC 61076-2-101, torque 3 to 4 Nm, mounting hole table by threadwebPublisher's page; dimensions are facts
Pepperl+FuchsV1-PG13,5-Y124355 M12 / PG13.5 receptacle: same mounting hole table, locknut includedwebPublisher's page; dimensions are facts
Pepperl+FuchsM12 x 1 A-coded receptacles with M16 or PG9 mounting thread, 4 / 5 / 8 pinswebPublisher's page; dimensions are facts
Mouser (M8Con datasheet)M8 straight panel-mount connectors 3 / 4 pin, A-coded, M8 x 1, IEC 61076-2-104, 4 A / 60 VwebPublisher's page; dimensions are facts
IO Connections (elitaliaweb copy)M12 male panel mount front-fastened: codings A, B, C, D; 3 to 17 pins; chassis thread 'PG9 or M16 x 1.5'webPublisher's page; dimensions are facts
Same Sky (CUI Devices)CDM1211-04D-MT-F9-67: M12 D-coded 4-position receptacle, M16 x 1.5 mounting thread, IP67webPublisher's page; dimensions are facts
L-comM12 connector coding demystified (A to X by application)webPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

panel-hole-gauge-m8-m12-m16-pg9-pg13-5-m20Panel-hole gauge plate for circular-connector receptacles: six through holes Ø8.2 (M8 × 0.5), 12.2 (M12 × 1), 15.3 (PG9), 16.1 (M16 × 1.5), 20.1 (M20 × 1.5), 20.5 (PG13.5), smallest first, hole diameters as in the Pepperl+Fuchs mounting table; plate 136.4 × 34.5 × 3 mm with 3 mm corners is an exampleSTEP · STL
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Plain text: sheet.txt · JSON: /api/geometry?object=m12-m8-circular-sensor-connectors

M12 and M8 circular sensor connectors: thread, coding A / B / D / X, pin counts and panel-mount hole sizes (+ hole gauge), isometric render of a generated part
Render of panel-hole-gauge-m8-m12-m16-pg9-pg13-5-m20 from the free STEP; not to scale.

Fits with

Metric cable glands M12–M63: thread, panel hole (EN 60423), cable range, height, key size + hole gauge, isometric render of a generated part
Metric cable glands M12–M63: thread, panel hole (EN 60423), cable range, height, key size + hole gauge332.7×79.4×3.0 mm★ 1 file
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
Standard cable and plug sizes: USB-C, USB-A, Micro-B, Lightning, HDMI, RJ45, DC barrel, cable and power-cord diameters, isometric render of a generated part
Standard cable and plug sizes: USB-C, USB-A, Micro-B, Lightning, HDMI, RJ45, DC barrel, cable and power-cord diameters16 sizes★ 9 files
Screw terminal blocks: Phoenix MKDS 1,5 and MKDS 3 (5.0 / 5.08 mm), 2–6 positions, isometric render of a generated part
Screw terminal blocks: Phoenix MKDS 1,5 and MKDS 3 (5.0 / 5.08 mm), 2–6 positions15 sizes★ 15 files
Pluggable terminal block headers: Phoenix MSTBA / MSTBVA 2,5 (5.0 / 5.08 mm), 2–6 positions, isometric render of a generated part
Pluggable terminal block headers: Phoenix MSTBA / MSTBVA 2,5 (5.0 / 5.08 mm), 2–6 positions20 sizes★ 20 files
Thread size reference: UNC / UNF and ISO metric coarse / fine — major, minor and pitch diameter, tap drill, clearance hole (close, normal, loose)201 sizes★ sheet

Questions

What size hole does an M12 panel receptacle need?

It depends on the body thread: Ø16.1 for M16 × 1.5, Ø15.3 for PG9 (Pepperl+Fuchs); the M12 × 1 plug thread itself is the coupling side.

What is the difference between A, B and D coded M12?

Different key patterns: A for sensors and DC power, B for PROFIBUS, D for 100 Mbit industrial Ethernet (4 pins), X for 10 Gbit Ethernet (8 pins).

What standard defines M12 connectors?

IEC 61076-2-101 (A, B, D coding); X is -2-109, K, L and S are -2-111, Y is -2-113.

What thread is an M8 sensor connector?

M8 × 1 (IEC 61076-2-104, A-coded 3 and 4 pin); the panel body thread of M8 receptacles is M8 × 0.5 with an 8.2 mm hole.