discount 70% in 2018-09-21 to 2018-09-23
price: USD$ 73.50
freight :USD$7.00,(Postal parcel)
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Various types of reamer are hand reamer, taper reamer, machine reamer, taper shank reamer, lengthened reamer, alloy reamer and so on.
The accuracy level of machine reamer is: DD4H7H8H9
DD4 is the old standard, and H7H8H9 is the new standard.
The levels are: (high to low permutation) H7 > D > H8 > D4 > H9
Reamer tolerances are generally add size (commonly known as silk)
Example: 10 mm reamer
D class 10.01 mm
D4 class 10.02 mm
H7 class 10.005 - 10.01 mm
H8 class 10.01 - 10.015 mm
H9 class 10.02 mm
The blade is H long than D times a prefect