To order with counterbore, add the prefix letter C Ӕ to the symbol.When using drill bushings with special tools, such as reamers, counterbores, taps, pilots, etc., it would be anadvantage is the exact hole size is specifiedinstead of the tool size. This type of bushing will be priced as a special Ӕ. They can also be supplied without counterbore. Counterbore Certain bushings are relived in the I.D., depending on the bore-to-length ratio. Countersink For drill entry end Ԗ a blended radius. Any other decimal millimeter size within agiven range is considered ֓ special and will be pricedaccordingly. range are sizes listed in the decimal equivalent chart either as a fraction, number or letter size. 0007 Hardness 62-64 Rockwell C Lead Standard Sizes All finish ground press-fit bushings have a concentric ground lead for exact alignment in press-fit starting. Standard Drill SIzesI.D.Tolerance #80 to 1/4Nominal+. Specialty steels are available upon request. Drill bushings are manufactured from C1144 stress-proofsteel, or other high carbon steels known for their long wearand stability.
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