Type 427 Fractional
Tools - Reamers - Coolant Fed Reamers - Coolant Fed Reamers with Left Spiral Flutes and Flute Fed Coolant for Through Holes

Chip ClassMaterial MachinedTool Type
20NON-FERROUS - LONG CHIPS427
40NON-FERROUS - SHORT CHIPS427 / 428
60CAST IRONS428
80LOW STRENGTH STEELS429 / 428
100MEDIUM STRENGTH STEELS 429
120HIGH STRENGTH STEELS429
140HIGH TEMPERATURE ALLOYS429

Description

  • Coolant outlets in each flute
  • Polished flutes; flute long carbide on .2841" tool diameter and larger
  • Left spiral flutes should not be used on blind holes
  • Geometry and carbide grade appropriate for material being machined
  • Carbide tips brazed to tough hardened alloy steel body
  • Polished flutes for easy chip flow
  • Precision ground cutting edges
  • Material specific reamer shanks are ground to next smallest shank diameter listed in NAS 897 if tool diameter is within .005" of shank diameter

Modifications

  • Modified tool diameter - priced below
  • Metric tool diameter
  • Closer tool diameter tolerance
  • Cutting diameter reduced for step or pilot
  • End chamfer other than 45º
  • End cutting or corner radius
  • Increased / decreased circular margin
  • Increased / decreased tool diameter back taper
  • Shortened shank or reduced shank diameter
  • Flat(s) or tang on shank
Coatings available:
  • TITANIUM NITRIDE - TiN
  • TITANIUM CARBONITRIDE - TiCN
  • ZIRCONIUM NITRIDE - ZrN
  • AL TITANIUM NITRIDE - AITiN

Use

  • Flute coolant outlets for reaming thru holes as chips are flushed forward through the hole being reamed
  • Improves hole finish and permits higher feeds & speeds with longer tool life
Decimal DiameterFractional DiameterCarbide LengthFlute LengthMax Shank DiameterNumber Of FlutesOverall LengthEDPPrice
1.50001 1/23 1/23 1/21.2495812 1/242748 $465.30
1.18751 3/162 7/82 7/80.999581142738 $402.65
1.25001 1/4330.9995811 1/242740 $407.85
1.31251 5/16330.9995811 1/242742 $419.65
1.37501 3/83 1/43 1/40.999581242744 $436.40
1.43751 7/163 1/43 1/40.999581242746 $450.10
0.937515/162 5/82 5/80.749581042730 $362.70
0.968831/322 5/82 5/80.749581042731 $363.65
1.000012 3/42 3/40.8745810 1/242732 $364.15
1.06251 1/162 3/42 3/40.8745810 1/242734 $384.95
1.12501 1/82 7/82 7/80.874581142736 $386.60
0.781225/322 1/22 1/20.624569 1/242725 $300.60
0.812513/162 1/22 1/20.624569 1/242726 $304.20
0.843827/322 1/22 1/20.624569 1/242727 $309.70
0.87507/82 5/82 5/80.749561042728 $326.60
0.906229/322 5/82 5/80.749561042729 $345.80
0.62505/82 1/42 1/40.56156942720 $250.75
0.656221/322 1/42 1/40.56156942721 $277.70
0.687511/162 1/42 1/40.56156942722 $283.30
0.718823/322 1/42 1/40.56156942723 $289.40
0.75003/42 1/22 1/20.624569 1/242724 $295.55
0.468815/321 3/41 3/40.37306742715 $229.85
0.50001/2220.43556842716 $232.80
0.531217/32220.43556842717 $237.70
0.56259/16220.43556842718 $241.10
0.593819/32220.43556842719 $246.15
0.31255/161 1/21 1/20.27924642710 $220.90
0.343811/321 1/21 1/20.27924642711 $222.60
0.37503/81 3/41 3/40.31054742712 $224.75
0.406213/321 3/41 3/40.31054742713 $225.70
0.43757/161 3/41 3/40.37306742714 $227.80
0.25001/41/21 1/20.24054642708 $197.15
0.28129/321/21 1/20.24854642709 $209.05
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