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Inductive sensors M8

( number of products: 544 )

Inductive sensors M8 in a threaded housing: sensing range 1–6 mm, PNP or NPN output, NO, NC or NO & NC function, cable or M8/M12 connector. Use the filters to narrow the list; selection tips are below the list.

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Inductive sensor M8 – what this category offers

An inductive sensor M8, also called a proximity sensor, detects metal objects without contact. All models in this category share a few features:

  • supply voltage 10–30 V DC, output load up to 200 mA, short-circuit protection,
  • IP67 protection rating and ambient temperature from -25 to +70°C,
  • LED indicator,
  • PBT sensing face, stainless steel housing; nickel-plated brass in flush versions with a 4 mm range.

Sensing range of the inductive sensor M8

The available rated sensing range Sn depends on the mounting type:

  • flush mounting (sensing face level with the metal surface): 1, 2, 3 and 4 mm,
  • non-flush mounting (the sensing face needs free space around it): 2, 4 and 6 mm.

Read more about choosing the range in our guide inductive sensors M8 4 mm and M12 8 mm. For a longer range, see inductive sensors M12. For tighter spaces, see inductive sensors M5.

Sensing range and the detected metal

The rated range applies to steel. For other metals, multiply it by the reduction factor:

  • Fe37 steel – 1,
  • cast iron – 0.95–1,
  • stainless steel – 0.8–1,
  • nickel – 0.6–0.75,
  • brass – 0.4–0.7,
  • aluminium – 0.35–0.6,
  • copper – 0.25–0.5.

Example: an M8 sensor with a 4 mm range detects aluminium from 1.4 to 2.4 mm.

Switching frequency

The longer the range, the lower the switching frequency. This matters with fast-moving parts:

  • range 1 and 2 mm – 2 kHz (response time 0.1 ms),
  • range 3 mm and 4 mm non-flush – 1 kHz (0.2 ms),
  • range 4 mm flush and 6 mm – 500 Hz (0.5 ms).

PNP or NPN, NO or NC

M8 sensors are available with a PNP or NPN output – the choice depends on the controller inputs. The differences are explained in the guide PNP vs NPN – how inductive sensors differ. The switching function is NO, NC or NO & NC, i.e. both contacts in one sensor. NO and NC versions are 3-wire, NO & NC versions are 4-wire. More about the functions in the guide inductive sensors NO, NC and NO & NC. Ready-made lists of the most popular versions: inductive sensors M8 PNP NO, M8 PNP NC, M8 NPN NO, M8 NPN NC, and with both contacts – M8 PNP NO & NC and M8 NPN NO & NC.

Housing length and connection

  • with cable – housing 18, 30 or 45 mm, PVC cable 3 mm in diameter, 2 or 3 m long,
  • with M8 connector – housing 18–60 mm, 3 pins in NO and NC versions, 4 pins in NO & NC versions,
  • with M12 connector – housing 45, 53 or 70 mm, always 4 pins,
  • with a 0.3 m cable ending in an M8 connector.

Cable and connector for the M8 sensor

Sensors with an M8/M12 connector work with cables with M8 and M12 connectors and field-wireable M8 and M12 connectors.

When to choose another M8 sensor family

Frequently asked questions

Does the inductive sensor M8 detect aluminium?

Yes, but from a shorter distance than steel. The reduction factor for aluminium is 0.35–0.6.

What is the difference between flush and non-flush mounting?

A flush sensor can sit level with the metal surface. A non-flush sensor needs free space around the sensing face but offers a longer range in the same size – up to 6 mm for M8.

What supply voltage does the inductive sensor M8 need?

Sensors in this category operate at 10–30 V DC.

What warranty do Nexotec sensors have?

24 months.