M3/M4/M5 Short-Body Separate-Amplifier Inductive Proximity Switches (15mm)

Name: M3/M4/M5 Short-Body Separate-Amplifier Inductive Proximity Switches (15mm)
Brand: DAIDISIKE
SKU: m3-m4-m5-short-body-separate-amplifier-inductive-proximity-switches
Availability: InStock

Ultra-short 15mm-body M3/M4/M5 unthreaded inductive proximity switches for space-constrained metal-target sensing.

M3/M4/M5 Short-Body Separate-Amplifier Inductive Proximity Switches (15mm) - dimensional drawing

🔍 Click to enlarge · 1/11

Technical Specifications

Sensing Method	Inductive (M3 / M4 / M5)
Body Type / Length	M3: D3, 15mm, unthreaded; M4: D4, 15mm, unthreaded; M5: short separate-amplifier type
Output Type	NPN / PNP, NO / NC (all diameters)
Sensing Distance	M3: 0.6 / 0.8 / 1.0 mm; M4 & M5: 0.8 / 1.0 / 1.2 / 1.5 mm
Wiring	3-wire (DC)

Overview

This is a family of small-diameter (D3/D4/M5), threadless, 15mm short-body inductive proximity switches for detecting metal targets at close range. Because they have no mounting thread, they are fitted (not screwed) into a housing or bracket, which suits designers who need the smallest possible footprint inside a machine, jig, or tooling assembly.

They are intended for OEM machine builders, panel and tooling integrators, and automation engineers who are retrofitting or designing compact mechanisms - cylinders, small fixtures, gauging jigs, packaging heads - where a standard M8/M12 threaded proximity switch will not physically fit. M3 offers 0.6/0.8/1.0mm sensing distance, while M4 and M5 offer 0.8/1.0/1.2/1.5mm, each available in NPN/PNP output with NO/NC selection on a 3-wire DC connection.

Features & Benefits

Ultra-Short 15mm Body

At just 15mm long, this body is markedly shorter than the same brand's standard M3/M4 unthreaded proximity switches (25mm) and threaded M5 switches (25mm). That extra clearance frees up axial space in compact assemblies where a standard-length sensor simply won't fit.

Three Diameters: D3, D4, M5

Available in three diameters - D3, D4, and M5 - to match different bore and bracket sizes without redesigning the mounting point.

NPN/PNP Output, NO/NC Selectable

Every diameter and sensing distance is offered in both NPN and PNP transistor output, each with normally-open (NO) or normally-closed (NC) logic, giving direct compatibility with common PLC input cards, whether sourcing or sinking.

Multiple Sensing Distances per Diameter

M3 offers 0.6mm, 0.8mm, or 1.0mm sensing distance; M4 and M5 offer 0.8mm, 1.0mm, 1.2mm, or 1.5mm. This lets engineers fine-tune trigger distance to the target size and installation gap tolerance of their application.

3-Wire DC Connection

All variants use a 3-wire DC connection scheme, consistent with standard PNP/NPN 3-wire proximity switch wiring practice.

Systematic Model Coding

Model numbers directly encode output type, NO/NC logic, and sensing distance - for example, M30615N1 denotes M3 diameter, 0.6mm sensing distance, NPN output, normally-open, 15mm body. This makes part selection and reordering straightforward.

Applications

Small Pneumatic Cylinder / Actuator Position Sensing — The 15mm short body and D3/D4/M5 small diameters fit into narrow cylinder brackets and slots where a standard-length proximity switch cannot physically be installed.

Compact Tooling and Gauging Fixtures — Threadless, fitted-in mounting combined with the ultra-short body suits jig and fixture structures with limited installation space.

Packaging Machinery Small-Part Detection — Sensing distances from 0.6mm to 1.5mm suit close-range detection of small metal parts or mechanism positions.

OEM Machine Retrofits with Limited Installation Depth — The 15mm short body allows a proximity switch to be added without changing the original structural depth of the machine.

PLC-Integrated Automation Cells (NPN/PNP Compatible) — Both NPN/PNP output and NO/NC logic combinations are available, matching different PLC input card types directly without extra interface adapters.

Small Metal Target Counting or Presence Detection — Multiple sensing-distance options (0.6-1.5mm) allow precise close-range triggering tailored to different sizes of metal targets.

Models & Ordering Information

M3 Unthreaded Short-Body (D3 x 15mm)

M30615N1M30615P1M30615N2M30615P2M30815N1M30815P1M30815N2M30815P2M31015N1M31015P1M31015N2M31015P2

Sensing distance 0.6/0.8/1.0mm; N = NPN, P = PNP; suffix 1 = NO, suffix 2 = NC.

M4 Unthreaded Short-Body (D4 x 15mm)

Ф4N1150.8Ф4P1150.8Ф4N2150.8Ф4P2150.8Ф4N11510Ф4P11510Ф4N21510Ф4P21510Ф4N11512Ф4P11512Ф4N21512Ф4P21512Ф4N11515Ф4P11515Ф4N21515Ф4P21515

Sensing distance 0.8/1.0/1.2/1.5mm; N = NPN, P = PNP; suffix 1 = NO, suffix 2 = NC.

M5 Short Separate-Amplifier Type

M5N10.8M5P10.8M5N20.8M5P20.8M5N110M5P110M5N210M5P210M5N112M5P112M5N212M5P212M5N115M5P115M5N215M5P215

Sensing distance 0.8/1.0/1.2/1.5mm; N = NPN, P = PNP; suffix 1 = NO, suffix 2 = NC. These model codes overlap with the threaded M5 25mm series listing in the source catalog; the two are distinguished by physical body form - confirm the exact model with sales before ordering.

How to Select

M3 (D3 x 15mm) offers 0.6mm, 0.8mm, or 1.0mm sensing distance - choose a shorter distance for smaller targets or tighter installation gaps.
M4 (D4 x 15mm) and M5 (short separate-amplifier type) offer 0.8mm, 1.0mm, 1.2mm, or 1.5mm sensing distance.
NPN output (model code contains "N", e.g. M30615N1) suits PLC sinking inputs; PNP output (model code contains "P") suits PLC sourcing inputs - confirm your PLC input card type before ordering.
Normally-open (NO) logic uses suffix "1" (e.g. N1, P1): output is off with no target and turns on when the target approaches.
Normally-closed (NC) logic uses suffix "2" (e.g. N2, P2): output is on with no target and turns off when the target approaches. Choose based on your downstream PLC logic to avoid interlock errors.
D3 (M3 series) suits the smallest mounting bore and smallest targets; D4 (M4 series) is a mid-size diameter balancing strength and mounting space; M5 has a larger diameter for better mechanical strength while keeping the 15mm short body.
All models in this series share the same 15mm short body length, distinct from the same brand's standard-length unthreaded M3/M4 (25mm) and threaded M5 (25mm) - if installation space allows, standard-length models offer a longer mechanical support surface.

📘 Need the full method? How to Choose a Proximity Sensor · NPN vs PNP Sensor Outputs Explained

When NOT to specify the M3/M4/M5 — and what to use instead

Sizing a power supply or confirming voltage compatibility before ordering

Why not: This 15mm short-body series does not publish an operating voltage rating in its specs; the product's own FAQ states to contact the factory for the confirmed voltage range.

Use instead: Confirm the operating voltage with the factory first, or specify the standard-length M3/M4 non-threaded (25mm) inductive proximity switch series, which publishes a 10-30VDC rating.

Outdoor, washdown, or dusty environments requiring a stated IP rating

Why not: No IP ingress-protection rating or operating-temperature range is published for this 15mm short-body series.

Use instead: The M3/M4 non-threaded standard-length (25mm) series, which is rated IP67 and -25°C to +70°C, if the longer body fits the installation.

Detecting non-metallic targets

Why not: This is an inductive family, so it senses metal only.

Use instead: A capacitive proximity sensor, such as the M8 capacitive proximity switch, the smallest-diameter capacitive family currently offered.

Ordering the M5 "short separate-amplifier" variant by model number alone

Why not: Per the product's own FAQ, the M5 short-body model codes overlap with the threaded M5 25mm series in the source catalog, and the two are distinguished only by physical body form.

Use instead: Confirm the exact model number and body form with the sales team before ordering, as stated in the FAQ.

High-speed counting where response time or switching frequency is a selection criterion

Why not: Response time and switching frequency are not published for this series.

Use instead: Confirm timing specs with the factory, or use the M3/M4 non-threaded (25mm) series, which is rated 0.1-0.3ms response and 1-2KHz switching frequency.

Safety-related guarding or interlocks

Why not: No safety rating is claimed for this product.

Use instead: A dedicated safety switch or safety light curtain (DX series).

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Operating voltage range - not published; the FAQ instructs contacting the factory
IP ingress-protection rating
Operating temperature range
Response time and switching frequency
Housing material
Cable length and wire color/pinout assignment
MTBF and certification marks (CE, UL, etc.)
Exact distinguishing model code for the M5 short separate-amplifier type versus the threaded M5 25mm series

Frequently Asked Questions

What does "15mm short body" mean for M3/M4/M5 proximity switches?

It refers to the physical length of the sensor body - 15mm - which is shorter than this brand's standard-length unthreaded M3/M4 switches (25mm) and threaded M5 switches (25mm), making it suitable for installations with limited depth.

Are these proximity switches threaded?

No. This series is unthreaded (non-flush/threadless) - the sensor body is fitted into a housing or bracket rather than screwed in like a standard threaded M8/M12 proximity switch.

What sensing distances are available?

M3 versions offer 0.6mm, 0.8mm, or 1.0mm sensing distance. M4 and M5 versions offer 0.8mm, 1.0mm, 1.2mm, or 1.5mm sensing distance.

What output types are offered?

Both NPN and PNP transistor outputs are available, each in normally-open (NO) or normally-closed (NC) configuration, across all diameters and sensing distances.

How many wires does this sensor use?

All variants in this series use a 3-wire DC connection.

How do I read the model number, e.g. M30615N1?

M3 = M3 diameter series, 06 = 0.6mm sensing distance, 15 = 15mm body length, N = NPN output, 1 = normally-open (NO). The same logic applies to M4 and M5 model codes.

Is the M5 "short separate type" the same product as the threaded M5 25mm version?

The M5 short separate-amplifier type model codes overlap with the threaded M5 25mm series listing in our source catalog, and the two are distinguished by physical body form. Please confirm the exact model with our sales team before ordering.

What operating voltage do these sensors require?

Please contact us for the confirmed operating voltage range for this specific short-body (15mm) series.