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CMM Styli and Accessories® An Essential Component of CMM Operation

Styli and Accessories at a glance:

PWM stylus kit PWM individual styli PWM reference sphere
Stylus kits are avialable in many configurations and all thread sizes. Styli and accessories may also be purchased individually. Reference spheres are available with straight or angled shanks and either ceramic or steel balls.

Our new CMM Styli and Accessories® catalog is available now, featuring nearly 1,400 standard sizes and styles. Thread sizes for all major probing systems are available: M2, M3, M4, M4x.7, M5, M6, 1/4-20, 3/8-24, M8, Pins Reference Spheres, Centerline Locators and more. If a standard item isn't available - specials are our specialty. Download or request a printed copy today.

Stylus Technical Data

PWM Tipster

"Hi, I'm the Tipster, your personal guide to tips, short cuts and quick references. Technical data is supplied to help you choose the right stylus for your application. More technical data...

Stylus Anatomy 101

Call Out Description
dk Ball diameter
ds Shank diameter
D Ferrule diameter
L Overall length
ML Working length
M Thread
Wt. Approximate weight, in grams
Drawings are not to scale. Consult charts for actual dimensions

Ball and Shank Assembly

drilled ball/pivot mount stylus

Pivot Mount: A drilled ruby is glued to the reduced tip end of the the pivot at shank end.

undrilled ball stylus

Solid Ball Mount: An undrilled ruby is glued directly to the end of the shank

Advantages of Shank Materials:

  • Sub-mircon deflection
  • Small diameters
  • Non-magnetic
Stainless Steel:
  • Durable
  • Lowest cost
  • Wide-spread acceptance
  • Zero deflection
  • Light weight
  • Easy to see
  • Same Coefficient of Thermal Expansion as ball
  • Non-magnetic
Carbon Fiber:
  • Great for high speed machines
  • Light weight minimizes false triggering
  • Use for long stylus configurations
  • Non-magnetic
  • Light weight
  • Maximum strength
  • Highest accuracy
  • Same Coefficient of Thermal Expansion as ball

More, greater detailed information can be found on our stylus technical data page.

PWM Tipster

"Look to me for advice and creative applications in dozens of "How It Works" ideas throughout the new PWM "CMM Styli & Accessories" catalog."

Standard Ruby Ball Styli

Long shank, standard ruby ball styli at work
See our complete selection of ruby ball styli on

Disc Styli

Disc stylus applications

Select a disc stylus for notches and grooves. Use a lightweight extension and a knuckle for difficult to access bores.
View our complete line of disc styli on

Star Styli

Star stylus application

PWM star styli are available with standard fixed arms, or create your own custom design with a star adapter and any combination of styli. Add a knuckle adapter for angled access. Stars are also great for bores with undercuts and ideal for fixed position probe heads.
PWMs many diverse styles and designs of star styli can be found on

Star stylus bore application

Pointer Styli

Point stylus applications

Popular inspection applications for a point stylus are points in surface measurements, scribe lines and thread root depth. Ideal for reducing vector errors and when taking points manually. Choose PWM carbide point designs for rugged, prolonged use. Check for wear and replace often for best results.
See all of our point and scriber styli on

Cylinder (Sheet Metal) Styli

Cylinder stylus

A cylinder stylus are designed for sheet metal edge and surface measurement. Cylindrical ceramic or sapphire are the ultimate sheet metal materials. Great for measuring sheet metal cut-outs. Use the non-magenetic cylindrical shank on edges and the spherical tip for surface measurement. Select opaque ceramic or clear sapphire for best visibility - both are easy to qualify and nearly indestructible. Visit for PWMs complete line of cylinder styli.

Hollow Ceramic Sphere Styli

Hollow ceramic sphere applications

Lightweight, non-magnetic hollow ceramic sphere styli are great for large, deep bores. See our full line of large ceramic sphere styli on

Stylus Extensions

Stylus extensions

Lightweight extensions allow longer probe access on high speed CMMs and increase the life of probe heads. Choose a ceramic extension for light weight and stable performance - carbon fiber saves even more weight, but is not as stable. You can find PWMs complete line of stylus extensions on

Pin Styli

PWM Pin styli

Pin styli are a great alternative to custom probes - all pin styli can be combined with adapters and holders to create custom configurations specific to your needs - and they can be reconfigured later. We offer a large selection of pin styli and adapters on

Stylus Adapters

Adapters come in many different types: rotary and knuckle adapters save you the time of repositioning your probe head - crossover adapters convert styli for use on systems designed for other threads - star adapters allow you make your own star configurations with any combination of styli. Find our complete line of stylus adapters for all threads on

PWM stylus adapters

Stylus Tools

Stylus tools

Extend the life of your probes and components by always using the proper tools for installation. See our entire offering of stylus tools on

hex key
Hex key tools designed for tightening set screws
pin key
Pin key for tightening stylus and accessory assemblies
Philips head
Philips head for tightening set screws and accessories
probe spanner
Probe spanner for tightening extensions into probes.

Accessories for Electronic Height Gages

Shafts for height gages

Purchase a shaft, a pin stylus holder and an M2 stylus holder and build a complete set for any measuring need. Just add styli - be creative and add knuckles, adapters or other accessories.

Shaft, holders and styli

Shafts are compatible with Mahr, Mitutoyo, Tesa, Trimos, Vertex and Wenzel electronic height gages. Visit for a complete selection of height gage accessories.

Reference Spheres

PWM Reference Spheres are available in several configurations: straight or angled, in ceramic or steel and several ball diameters.

Angled reference sphere
Angled Reference Sphere
Straight reference sphere
Straight Reference Sphere
Reference sphere with 
              protective sleeve
Reference sphere with protective sleeve
Reference sphere with 
              changeable balls
Reference sphere with interchangeable balls
Base plate options

Standard and magnetic base plate designs provide modularity and versatility when mounting reference spheres.

Reference spheres with magnetic bases can be attached to tubular parts, to base plates, to the side of a part or anywhere, in any orientation the magenetic base will hold. Visit for more reference spheres, base plates, probe heads and accessories.

Probe Heads and Accessories

Probe head, mounting shank and extension

Be creative and add probe extensions, stylus extensions, knuckles, adapters and styli to design a configuration that meets your requirements.

Centerline Locators

PWM centerline locators

Select the thread where you need to measure, screw in a Center Line Locator and measure the outside or inside diameters for coordinates. See more center line locators on

PWM's diverse stylus and accessory designs and materials maximize strength, working length and accessibility according to your requirements. See our technical data for more information. Visit to see our complete line of CMM Styli and Accessrories.

PWM Tipster