Accuracy Grade* Measuring Range Blocks Per Set Blocks Included In Sets Catalog No. B89.1.9 0 B89.1.9 00 .100-12.000 in Steps of .001 .200-12.000 in Steps of .0001 81 9 blocks .1001 Through .1009 (Steps of .001) 49 Blocks .101 Through .149 (Steps of .001) 19 Blocks .050 Through .950 (Steps of .050) 4 Blocks 1.00 Through 4.000 (Steps of 1") RY 81.A1 RY 81.AA B89.1.9 0 B89.1.9 00 .100-12.000 in Steps of .001 .200-12.000 in Steps of .0001 .300-12.000 in Steps of .000025 1/16-12.000 in Steps of 1/64 88 Same as in RC 81.Set, Plus 3 Blocks .100025, .10005, .100075 4 Blocks 1/16, 5/64, 3/32, 7.64 RY 88.A1 RY 88.AA B89.1.9 0 B89.1.9 00 .200-8.000 in Steps of .001 .300-8.000 in Steps of .001 34 9 Blocks .1001 through .1009 (Steps of .0001) 9 blocks .101 Through .109 (Steps of .001) 9 Blocks .110 Through .190 (Steps of .010) 3 Blocks .100 through .300 (Steps of .100) 1 Block .500 3 Blocks 1.000, 2.000 and 4.000 RY 34.A1 RY 34.AA With Commercial Grade Calibration and Etched Serial Numbers. (Master Grade Calibration at Additional Cost) *Gage Tolerance Chart For individual gage blocks please contact us.
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
9 blocks .1001 Through .1009 (Steps of .001)
49 Blocks .101 Through .149 (Steps of .001)
19 Blocks .050 Through .950 (Steps of .050)
4 Blocks 1.00 Through 4.000 (Steps of 1")
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
Same as in RC 81.Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7.64
.200-8.000 in Steps of .001
.300-8.000 in Steps of .001
9 Blocks .1001 through .1009 (Steps of .0001)
9 blocks .101 Through .109 (Steps of .001)
9 Blocks .110 Through .190 (Steps of .010)
3 Blocks .100 through .300 (Steps of .100)
1 Block .500
3 Blocks 1.000, 2.000 and 4.000
*Gage Tolerance Chart
Rectangular Ceramic
Gage Block Sets-Inch System Gage Block Sets in Case
Gage Blocks – Major Product Characteristics
Precision gage blocks are the primary standards vital to dimensional quality control in the manufacture of parts. The four major characteristics that are necessary for a precision gage block are accuracy, surface finish, wear resistance and dimensional stability. Other factors are corrosion resistance, hardness, thermal conductivity and coefficient of expansion.
The base material used for gage blocks is crucial in meeting the above criteria. While many materials have been tried, the major types available today are:
NO ONE IN THE WORLD EXCEPT STARRETT/WEBBER HAS PRODUCED THE ACCURACY AND STABILITY OF OUR CROBLOX® GRAND MASTERS. They were produced in 1955 of Chromium Carbide material to an accuracy within one millionth of an inch (.0000254 mm) and have been checked periodically by the U.S. National Bureau of Standards and the U.S. National Institute of Standards and Technology (N.I.S.T.) and have remained stable over this period.
Other Characteristics:
Accuracy
All Starrett/Webber gage blocks meet or exceed all known specifications. The flatness, parallelism and surface finish necessary to achieve the required accuracies are the same as or better than government requirements.
Stability
Starrett/Webber gage blocks do not change in size except through normal wear. Gage block stability is a characteristic that our Webber Gage Division has mastered with over seventy years of experience. Our gage blocks have withstood the test of time.
Hardness
Steel blocks have a Rockwell “C” hardness of approximately 64-65. Chromium Carbide blocks have a Rockwell “C” hardness of 71-73, with an unusually fine, hard grain structure which gives them exceptional resistance to wear and abrasion.
Thermal Conductivity and Coefficient of Expansion
These are not important considerations when measurements are taken in temperature-controlled environments. This is primarily done when measuring to microinches or microns. On the shop floor, where precision measurements are rarely finer than .0002
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