NB PORT COUNTERBORES
MS33649 / SAE AS5202 & AND10050
All TOSCO Port Counterbore tools are form relieved to give the
customer a greater number of simple tool resharpenings, thus far
greater tool life. These tools are designed to perform all six operations
of the port contour at one pass to the latest Air Force-Navy Aeronautical
specifications. The "NB" style is for normal use on mills
and lathes. All TOSCO porting tools are heat treated and ground
between centers to guarantee concentricity. The "GB" style
port counter bore tools combine all features of the "NB"
style tools plus ground guide bushing diameter. This facilitates
operations where it is necessary to guide a tool through drill bushings.
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