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Xifeng straight shank machine reamer non standard 2/3/4/5/6/8/10/12/14/16/18/20H7

discount 70% in 2018-09-18 to 2018-09-20
price: USD$ 19.60
freight :USD$18.00,(Express)
freight :USD$7.00,(Postal parcel)
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Product name:Machine reamers with parallel shanks



Texture of material:High speed steel W6542

Machine reamers with precision grade: H7H8H9 D D4 
DD4 is the old standard, the new standard is H7H8H9.
Levels are: (rank) H7 > D > H8 > D4 > H9
Reamer tolerances are generally add size (commonly known as silk)
  Example: 10 mm reamer
  D 10.01 mm
  D4 10.02 mm
  H7 10.005 - 10.01 mm
  H8 10.01 - 10.015 mm
  H9 10.02 mm
  The blade is H long than D times a prefect