The simplest and most frequently used type of stylus,
suitable for the majority of probing applications.
Styli can have balls made from ruby, silicon nitride, zirconia,
ceramic or tungsten carbide.
The holders and stems come in a range of materials -
titanium, tungsten carbide, stainless steel, ceramic, carbon fibre.
M2 STY D2R L20 EWL14 d1.4SS
M2 thread straight stylus with a Ø2 mm ruby ball, 20 mm in length,
EWL of 14 mm and a stainless steel Ø1.4 mm stem.
These are multi-tip stylus configurations with fixed mounted styli.
These can be used to inspect a variety of different features,
including surfaces and holes with which direct contact can be made.
This configuration gives flexibility, enabling the tip to make
contact with features without changing the stylus. You can configure
your own star styli using stylus centres to mount up to 5 styli
The balls can be made from ruby, silicon nitride or zirconia. Each
tip on a star stylus requires datuming in the same manner as a
single ball stylus.
Star styli are not recommended for use on machine tools.
M2 STR D2R 5BALL L19.5 S32
M2 thread star stylus with a Ø2 mm ruby ball. It has 5 balls on the
star and has an overall length of 19.5 mm (from the centre of the
ball to the rear of the star mounting face when assembled on a
probe). The span of the star cluster is 32 mm.
These should not be used for conventional XY probing as they have
been designed for the measurement of thread forms, specific points
and scribed lines (to lower accuracy). Using radius end pointer
styli allows more accurate datuming and probing of features, and can
also be used to inspect the location of very small holes.
Pointer styli are not generally recommended for use on machine
M2 PNT D1.4TC 30 DEG L10
M2 thread pointer stylus with a Ø1.4mm tungsten carbide
stem/tip. The angle of the tip is 30° and 10mm in length.
Hemispherical ceramic styli
These are ideal for probing deep features and bores in X, Y and Z
directions with the need to datum only one ball. In addition, the
effects of very rough surfaces can be averaged out by probing with
such a large diameter ball.
M5 HEM D30 CER L26.5
M5 thread hemispherical stylus with a ø30mm ceramic hemisphere. The
length is 26.5mm from the end of the hemisphere to the mounting
These styli are sections' of highly spherical balls used to probe
undercuts and grooves within bores, which may be inaccessible to
Although probing with the "spherical edge" of a simple disc is
effectively the same as probing on or about the equator of a large
stylus ball, only a small area of this ball surface is available for
contact. Hence thinner discs require careful angular alignment to
ensure correct contact of the disc surface with the feature being
A simple disc requires datuming on only one diameter (usually in a
ring gauge) but limits effective probing to only X and Y directions.
Adding a radius end roller allows you to datum and hence probe in
the Z direction, providing the centre of the 'radius end roller'
extends beyond the diameter of the probe.
The radius end roller can be datumed on a sphere or a slip gauge.
Rotating and locking the disc about its centre axis allows the
'radius end roller' to be positioned to suit the application.
Disc may also have an M2 threaded centre to allow the fixing of a
centre stylus, giving the additional flexibility of probing the
bottom of deep bores (where access for the disc may be limited).
Disc styli are available in various diameters and thicknesses and
can be made from steel, ceramic or ruby.
Disc styli are not generally recommended for use on machine tools.
M2 DSC D18 SLVS T2.2 L2.6 BR-Y
M2 thread disc stylus with a disc diameter of 18 mm. It is made from
silver steel with a disc thickness of 2.2 mm and a length of 2.6 mm.
BR stands for balls/rollers followed by yes (Y) or no (N).
These are used for probing holes in sheet metal, pressed components
and thin work pieces with which proper contact cannot be guaranteed
with ball styli. In addition, various threaded features can be
probed and the centres of tapped holes located.
Ball ended cylinder styli allow full datuming and proving in X, Y
and Z directions thus allowing surface inspections to be carried
M2 CYL D3 SLVS L13 EWL4
M2 thread cylinder styli with a critical measuring element of Ø3 mm
made from silver steel. It has a length of 13 mm and an EWL of 4 mm.
These are available in different lengths and materials steel,
titanium, aluminium, ceramic and carbon fibre. With long extensions
consideration must be given to the thermal characteristics of the
M4 EXT L15 d7 SS
M4 thread extension with 15 mm length, Ø7 mm, made from stainless
Tool datuming styli
The tolerances to which tools can be set depends upon the flatness
and parallelism of the stylus tip to the machine axis. Fine
adjustment is provided on all probes and probe holders to allow
these settings to be achieved. Where rotating tools are to be
datumed for diameter the tools must be rotated in reverse to the
Tool datuming styli vary significantly but tend to have a common
mounting M4 thread or Ø4mm hole. On 4-sided square tips the length L
is from the measuring face to the mounting face. For 5-sided cubes
and round discs the length is to the front face.
Renishaw's stylus crash protection devices are designed to break in
the event of impact and protect the probe from damage.
If you would like any further information please contact
Custom designed styli
Renishaw offer a comprehensive custom
styli service, designing and manufacturing a specific stylus to
suit your requirements. Our in-house teams have a wealth of
experience and expertise, considering probe and application needs to
ensure the best solution is found.
Visit the custom
styli page to find out more.