The KOK ISOTOL
Computer Tolerancing Software ( Price $250.00 Part no. RKOK-CDTOL ),
provides the powerful tool you need to cut costs in manufacturing and
See How ISO METRIC
; Simply click on one of the ten proven fits . If you
decide to use a different hole or shaft tolerance, you can increase or reduce the
clearance by just a click on one of the 150 other tolerance zones. Each time
the new fit condition is instantly displayed. You can modify the fit,
and still specify one of the first choice tolerance zones for holes (H11 , H9 , H8
, H7) or shafts (h11 , h9 , h7 , h6)
which produce the largest cost reductions in gages,
material stock and tooling.
The ASME B32.100-2005 material standard and other
national standards for cold finished
steel rod material specify the four (4) preferred shaft tolerances h11 , h9
, h7 , and h6 in all the largest industrial countries of the world.
Preferred Basic Sizes
; Click on first, second or third choice basic size
or enter your own special size up to 3150 mm. You may also click on a
preferred inch size or enter a special size followed by the inch ,", symbol.
Output ; Instant display of limit dimensions for hole,
shaft and fit.
For example; 25H11/c11 (hole 25.130/25.000; shaft 24.890/24.760; fit
Press Copy in order to transfer the above line to drawing or specification.
The KOK ISOTOL
Computer Tolerancing Software system -
||see how the
ASME B32.100 standard shown in the e-book will help you cut
the number of material sizes used in your products|
||show you How
to Select the Optimum
Metric Sizes and Help
Cut Manufacturing Costs
Tolerance System Made
||provides instant display
of limit dimensions for hole, shaft and fit. |
||minimizes engineering time
required to specify proven fits. |
||makes it exceedingly easy
to tolerance dimensions. |
||reduces cost of cutting
tools, gages and material. |
||is completely parallel to
existing American tolerancing and gaging practices. |
||promotes specification of
fewer standard hole and shaft sizes and tolerance zones (holes; H11 , H9 , H8 , H7 , shafts ; h11 , h9 , h7 , h6 ) to help lower
||guides engineers from
customary inch to hard metric thinking. |
||is a totally flexible
system which will fit most tolerance and gage requirements. |
||cuts production lead time
by reducing delivery time for standard gages, material and cutting tools. |
||is completely documented
in national standards in all major countries. |
manufacturing of American products. |
1. I think the ISOTOL software is an excellent tool
for analyzing and harmonizing fits and tolerances of metric and inch designs. It's a
real timesaver because it minimizes errors when looking up numbers repeatedly in the ISO
tables. Mike E Yamat myamat
; Phone 414 768 8303 ; Fax 414 768 8236 (User of metric book and software) Cooper
Power Systems , 2800 9th Ave , S Milwaukee WI 53172
2. Rick wrote the following about the computer program; "ISOTOL
interfaces just fine with AutoCAD. The software works just fine with MDT. It is straight
forward and easy to use. It is a simple program that would be of great value to anyone
that needs to figure tolerancing". Rick Novara ricknovara at compuserve.com ; Phone 704 921 0303
; Fax 704 921 0304 , Novara Engineering, 12325 Mallard Ridge Drive, Charlotte NC 28269.
Industry Users of Metric Standards Book, Softwares
or Training Program
Preferred Basic Sizes
The first choice sizes follow approximately the preferred number series R5 where
succeeding numbers in the series increase by 60% . The second choice series shown are
rounded off from the R10 series of preferred numbers (25% increments) . Third choice sizes
shown are rounded off from the R20 series of preferred numbers (12% increments) . The
basic sizes conform to the ISO 497 R"20 rounded series. The preferred numbering
system is important to use when selecting sizes in the metric system . The French army
captain , Charles Renard , was able to reduce the number of different rope sizes used in
army balloons from .. 425 .. to .. 17 , with the aid of the series . The preferred number
series are designated R5 , R10 , R20 , etc . after the French army captain.
The selection of sizes in the metric system differ from the selection of sizes in the inch
system since each inch contain 25 integer (whole) millimeter sizes in the length of one
inch . The inch fractions have functioned to some extent as a rationalizing tool . The
fraction 1/2 is preferred over 1/4 ; 1/4 is preferred over 1/8 ; 1/8 is preferred over
1/16 ; etc .
Preferred Fits and Tolerance Zones
Ten (10) preferred hole and ten (10) preferred shaft basis fits ranging from loose running
to interference fits may be selected in the KOK ISOTOL Computer Tolerancing
Software main screen. You will see instant display of
hole, shaft and fit limits. For special fits you may choose from 150
other hole and shaft tolerances. The first choice tolerance zones are clearly
marked (F-green), and they are those used in the ten (10) preferred fits .
The KOK ISOTOL
Computer Tolerancing Software will allow the user, if
required, to modify the preferred fits to satisfy a special requirement.
The mating part may be changed and at the same time the user could specify one of the
preferred hole tolerances ; H11 , H9 , H8 , or H7 or one of the preferred shaft tolerances
; h11 , h9 , h7 , or h6. These tolerance zones are also preferred in the ISO
1829 standard . National standards for cold finished steel rod
reflect the four (4)
preferred shaft tolerances h11 , h9 , h7 , and h6 in the largest industrial countries of
the world . This is very important for rationalization purposes in industry. The potential
benefits this may give USA and worldwide manufacturing, is just immense.
It should produce even more savings than the millions of dollars gained in EU industries
over the past 70 years.
The ANSI B4.4M was withdrawn, and is now replaced by the ISO 1938-2012 standard.
For nearly two years a free online version of the
available. The online version was not intended to help design a
metric fit, but to interpret an existing metric fit and convert it
to inches. New online versions will be available later this year.
The free online ISOTOLTM version will no longer be available.
A new paid edition will probably be published later this year. For now, just use the details about
the system shown in the free Chapter 6 or buy the ISOTOLTM CD.
You may want to purchase the first edition of the software stored on an
Order your copy of
Metric Limits Software today!
( Price $250.00 Part no. RKOK-CDTOL )
The ISO System of Limits and Fits is documented in the ASME B4.2
(tolerances) and ASME B4.4M (gages) standards , and in the METRIC STANDARDS for Worldwide Manufacturing
books. The data in the
Computer Tolerance Software is according to the ASME B4.2, ISO 286-2 and
ISO 1829 standards. The preferred metric sizes shown are according to
the ASME B4.2 and
ISO 497 R20' standards. The software runs on any Windows versions.