Products \ Machine Tool Probe \ OMP40-2

OMP40-2 compact touch probe



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Compact touch probe with optical transmission, ideally suited to small machining centres.

About OMP40-2

The OMP40-2 probe has been designed specifically to meet the demands of small machining centres and the growing family of high-speed machines fitted with small HSK and small taper spindles.

OMP40-2 is available with modulated transmission for use with OMI-2 and OMI-2T receivers, offering increased resistance to light interference.

OMP40-2 features and benefits

  • Ultra-compact - only Ø 40 mm and 50 mm in length
  • Miniaturisation of electronics without compromising performance
  • Simplified installation - ideal for retrofit
  • Long battery life, minimal downtime, industry-leading economy
  • Shock and vibration resistant
  • Compatible with the Twin probe system

OMP40-2 system options

OMP40-2 with OMI-2T

OMP40-2 with OMI-2

OMP40-2 with OMI

OMP40-2 with OMM / MI 12

Offers a state-of-the-art modulated optical transmission method and the twin probe option. Offers a state-of-the-art modulated optical transmission method. Ideal for factory fitment by machine tool builders. Offers installation flexibility making it ideally suited for retro-fitting in the field.


OMP40-2 Specification


Length: 50 mm (1.97 in)

Diameter: 40 mm (1.57 in)

Weight 260 g (9.17 oz)
Transmission type 360° infra-red optical transmission (modulated or legacy)

Switch-on method

Optical on or Auto Start

Switch-off method Optical off or Timer

Operating range

Up to 5 m (16.4 ft)


OMI-2T, OMI-2, OMI-2H, OMI-2C, OMI or OMM/MI 12

Sense directions Omni-directional: ± X, ± Y, +Z
Uni-directional repeatability 1.0 ยตm (0.00004 in) 2 sigma (2s)*

Stylus trigger force (factory set)




low force direction

XY plane 0.5 N, 50 gf (1.76 ozf) §

+Z direction 5.85 N, 585 gf (20.63 ozf) §


high force direction

XY plane 0.9 N, 90 gf (3.17 ozf) §

+Z direction 5.85 N, 585 gf (20.63 ozf) §

Stylus overtravel

XY plane ± 12.5°

+Z direction 6 mm (0.24 in)

Battery type 1/2 AA Lithium Thionyl Chloride (3.6 V) x 2

Battery life (standard power)






MODULATED optical transmission mode

stand by 250 days 

5% usage 85 days

continuous life 140 hours


LEGACY optical transmission mode

stand by 250 days 

5% usage 115 days

continuous life 170 hours



Operating temperature 5 °C to 50 °C (41 °F to 122 °F)
Storage temperature -10 °C to 70 °C (14 °F to 158 °F)

* Probe performance specification is for a test velocity of 480 mm/min (1.57 ft/min) using a 50 mm (1.97 in) straight stylus.

§ Factory set using 50 mm (1.97 in) straight stylus.

OMP40-2 software options

The following software packages can be used to program probing routines for work piece set-up and inspection on CNC machining centres

  • EasyProbe - entry-level package for simple work piece set-up
  • Inspection - basic set-up and work piece inspection cycles, with automatic update of offsets
  • Inspection plus - an integrated suite of inspection cycles including vector measurement
  • Productivity+™ Active Editor Pro - a PC-based software package with GUI, allowing the user to select features directly from an imported CAD model, making the generation of probing cycles even easier.
OMP40-2 ordering information

Please contact your local Renishaw office to help design the OMP40-2 system most suited for your application.

OMP40-2 probe

Part number Description
A-4071-0001 OMP40-2 probe (Legacy, optical/optical)
A-4071-0002 OMP40-2 probe (Legacy, optical/time off 134s)
A-4071-2001 OMP40-2 probe (Modulated, optical/optical)
A-4071-2002 OMP40-2 probe (Modulated, optical/time off 134s)
OMP40-2 accessories
Part number Description
A-4071-1166 Square battery cassette
P-BT03-0007 Batteries (pack of 2)
A-5000-3709 PS3-1C stylus 50 mm
A-4071-0060 OMP40-2 tool kit 

OMP40-2 shank adaptor kit
(for mounting OMP40 to OMP60, MP10, MP12 and MP700 type shanks)