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Stylus Technical Data and Quality Control

Technical Data

Item Material Form Deviation Diameter Tolerance Hardness
(Vickers)		 Density (g/cm3) Surface Finish
Ruby Balls Synthetic ruby AI2O3 monocrystalline <0.2µm ±0.25µm 1800 3.9 0.015µm
Hollow Ceramic Balls Alumina, AI2O3 ceramic polycrystalline <0.6µm ±0.6µm 1650 3.9 0.1µm
Cylinder Stainless steel <2µm ±10µm 250 7.9 0.4µm
Cylinder Synthetic ruby AI2O3 monocrystalline <1µm ±1µm 1800 3.9 0.05µm
Cylinder Tungsten carbide <1µm ±1µm 1550 15.0 0.2µm
Ball Disc, Ceramic Ceramic, Alumina AI2O3 ceramic polycrystalline <0.6µm ±0.6µm 1650 3.9 0.1µm
Ball Disc, Steel Stainless Steel <3µm ±10µm 250 7.9 0.4µm
Ball Disc, Steel Hardened steel <2µm ±10µm 720 7.9 0.2µm
Shank / Extension Stainless steel -- -- -- 7.9 --
Shank / Extension Ceramic, Alumina AI2O3 ceramic polycrystalline -- -- -- 3.9 --
Shank / Extension Carbon fiber -- -- -- 1.5 --
Shank Tungsten carbide -- -- -- 15.0 --
Extension 7075 high strength aluminum Hard coat anodized surface with PTFE inserts 2.8 --

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Quality Control A.F.B.M.A. Grade Tolerances and Terminology

A.F.B.M.A. Grade Diameter Tolerance per Ball Sphericity Diameter Tolerance per Unit Container Basic Diameter Tolerance Marking Increment
  Inch Inch Inch Inch
3 .000003 .000005 ±.00003 .000003
5 .000005 .00001 ±.00005 .000005
10 .000010 .00002 ±.0001 .000010
15 .000015 .00003 ±.0001 .000015
25 .000025 .00005 ±.0001 .000025
50 .00005 .0001 ±.0002 .00005
100 .0001 .0002 ±.0005 .0001
200 .0002 .0004 ±.0010 .0002
  • Grade:  The numerical value of the diameter Tolerance Per Ball expressed in millionths of an inch.
  • Diameter Tolerance per Ball Sphericity:  The permissible difference between the largest diameter
    and the smallest diameter measurable on one ball.
  • Diameter Tolerance per Unit Container:  The permissible range of the average diameters of the
    individual balls within any one container
  • Basic Diameter:  The size ordered which is the basis to which the basic diameter tolerances apply. 
    The Basic Diameter is specified by a fraction plus a decimal or a decimal only to the sixth place,
    e.g. 1/4" + .0002", or .2502", 15/64" + .0003" or .234675"
  • Basic Diameter Tolerance:  The maximum allowable deviation of any ball diameter from the basic
    diameter, in any shipments to fill orders for that basic diameter.
  • Marking increments:  The standard unit steps in millionths of an inch used to express the
    Specific Diameter

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ISO Certification
Throughout the Styli section of our catalog you will see the logos the pictured here.  These logos indicate that the stylus manufacturer is certified for compliance with ISO procedures.  All of our suppliers have been selected because of their accuracy, reliability and consistency.

Kolb & Baumann GmbH. (makers of KOBA) is ISO certified and also offers certification of individual reference masters through the DKD or PTB (optional).

iso_web.jpg (16802 bytes)

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The contents of the web-site are copyrighted © 1998, 2004, 2005, 2006, 2007 by Paul W. Marino Gages, Inc.  Reprint by permission only.
AMT®, American Modular Tooling® and Solutions® are trade names of Paul W. Marino Gages, Inc.
KOBA® is a registered trade name of Kolb & Baumann GmbH. of Germany,  The KOBA-Step® and KOBA-Check® are protected by patents.
Photos and illustrations contained herein may show items or components not distributed by Paul W. Marino Gages, Inc.
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Every effort has been made to insure the accuracy of this site.

Paul W. Marino Gages, Inc.
21300 MacArthur Blvd.
Warren MI 48089-3020  USA
Phone: (800) 528-9785 (North America) / (586) 759-2400
FAX: (800) 775-7829 (North America) / (586) 759-2423
  e-mail: pwminc@covad.net

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