Comtorgage Reference Rings are made of carefully selected steel which is heat treated for correct hardness, then stabilized and lapped to size. Reference Rings are normally sized to the mean bore dimension. Class of ring selected is normally determined by applying 10% of the total part gaging tolerance.

All Reference Rings have been carefully inspected for size and class in our environmental condition lab, constantly held and recorded to a strict cool 68° F (+/- 1/2°) and relative humidity between 30-50% assuring optimum measurement accuracy. The masters used are directly traceable to NIST. These reports are complete in every way and meet or exceed all quality directives from ISO, QS-9000 series, ISO-10012-1, ANSI / NCSL Z540-1, ISO Guide 25 including A2LA and NVLAP accreditation groups.

Proper gage inspection requires calibrating the gage at six seperate points to determine size and geometry. The first three points measured are at the top, middle, and bottom of the x axis (left). The gage is then rotated 90 deg. so that the y axis is horizontal and the top, middle, and the bottom points of the y axis can be measured (right). The measurements are made at the center and 1/16 in. from the edge of the radius at both ends of the gage. Measurements for XXX class masters are made at the middle third only. These comparative measurements will reveal any deviation in millionths of an inch or hundredths of a micron from the mean. Certification can be furnished on request.

Options:

Special Marking ( tool no., operation no., etc. )
Chrome Plating ( Not available for rings under .1590" )
Knurled Surface Painted in Color
Bottoming Disc