Products \ CMM Probe \ SP25M



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The SP25M comprises two sensors in a single housing. Users can switch between a choice of four scanning modules (which can carry M3 styli with lengths from 20 mm to 400 mm) and an adaptor module that is compatible with Renishaw's TP20 range of probe modules. This capability enables scanning and touch-trigger probing in a single probe system.

The SP25M's compact size and autojoint mounting makes it compatible with the PH10M/MQ and PH6M probe heads. It can also be mounted on a multiwired extension bar. Together, these combinations permit excellent reach and access to part features.

For details of the technology in SP25M, refer to the SP25M Technical Paper.


  • World's smallest scanning probe at only 25 mm in diameter

  • Excellent metrology - isolated optical sensing and 3rd order polynomial compensation

  • Four modules provide optimal performance across a range of stylus lengths (up to 400 mm)

  • Two sensors in one - scanning and touch-trigger

  • Crash protection and simple stylus changing

  • Fast and simple probe calibration cycle

  • Ideal for profile and form measurement

  • Suitable for use on motorised indexing heads for greater flexibility and shorter scanning cycle times

  • Simple and robust design for greater reliability - no motors or locking mechanisms 


SP25M specification

Mounting Renishaw autojoint : PH10M, PH10MQ or PH6M
May be mounted on autojoint extension bars
Suitable interface Either: UCC controller
Or: AC3 PC interface card for machines not fitted with the UCC controller
Probe attributes 3-axis analogue measurement (X, Y, Z)
Pivoting motion in XY plane with translation in Z direction

For SM25-5: Plane translation in all 3 axes XYZ

Measurement range ±0.5 mm (±0.02 in) in X, Y and Z

For SM25-5: ±0.3 mm

Overtravel range ±2.0 mm (±0.08 in) in X and Y
1.7 mm (0.07 in) in +Z
1.2 mm (0.07 in) in –Z

For SM25-5:
±X, ±Y = 0.95 mm (0.037 in)
+Z = 1.0 mm (0.039 in)
-Z = 1.1 mm (0.043 in)

Crash protection: X, Y, –Z - break-off of either module or stylus holder
+Z - integral bump-stop design
Resolution < 0.1 µm (0.000004 in) with either UCC2 daughtercard or AC3 interface card
Spring rate 0.2 N/mm to 0.6 N/mm nominal dependent on stylus length
Damping Single viscous fluid damper

For SM25-5: Two viscous fluid dampers

Power supply +12 V (±5%), –12 V (+10% / –8%), +5 V (+10% / –13%) DC at probe
Outputs (X,Y,Z) Non-linear and non-orthogonal analogue outputs - rate, gain and resolution are not fixed
SP25M requires that a non-linear, third-order polynomial calibration method is used.
Stylus range M3


SP25M modules and stylus holders

A range of module kits allows SP25M users to build up their probing capability over time.

Each SM25-# scanning module is optimised in terms of gain and spring rate to suit the range of stylus lengths specified. For every module, there is a matching SH25-# stylus holder.

The SH25-3 and SH25-4 stylus holders are constructed with a fixed carbon fibre stem to which an M3 stylus is mounted, selected to provide the correct working length.

Whilst the SP25M can carry cranked (non straight) styli configurations when using SM25-1/2/3/4 scanning modules and the original standard stylus holders (SH25-1/2/3/4) but for optimum metrology where larger offsets are required Renishaw recommends the new SH25-2A/3A/4A range of stylus holder, specifically designed to meet the challenges posed by such stylus arrangements.


FCR25 flexible changing racks

A range of FCR25 module changing systems, each of which allows any of the SP25M system elements to be stored in each port.

  • SM25 scanning modules and the TM25-20 TTP module adaptor can be docked directly into the FCR25 ports
  • SH25 scanning stylus holders require a PA25-SH adaptor
  • TP20 modules can be stored with the help of a PA25-20 adaptor


FCR25 FCR25-L3 FCR25-L6 FCR25 port adaptor insert kit

 MRS with two FCR25 triple-port units



 FCR25 ports

Triple port unit  suitable for fitment to the MRS modular rack system. 3-port stand-alone unit for smaller CMMs and optical CMMs. 6-port stand-alone unit for smaller CMMs and optical CMMs. PA25-SH and PA25-20 inserts to store SH25-# stylus holders or TP20 probe modules

AC3 interface card

The AC3 interface card is designed for use where a PC or OEM Controller (ISA Bus) provides control of the CMM system. The card performs probe management functions.

SP25M probe kits

Please contact your local Renishaw office to aquire the full list of the currently available SP25 probe kits.