DRILLS REAMERS COUNTERBORES END MILLS CUTTERS SINGLE POINTS
REAMERS - COOLANT FED REAMERS - Left Spiral Flutes - Flute Fed
Fractional   Extended Length

TOOL SELECTOR
CHIP
CLASS		MATERIAL MACHINEDTOOL TYPE
 20  NON-FERROUS - LONG CHIPS  427 
 40  NON-FERROUS - SHORT CHIPS  427 / 428 
 60  CAST IRONS  428 
 80  LOW STRENGTH STEELS  429 / 428 
 100  MEDIUM STRENGTH STEELS  429 
 120  HIGH STRENGTH STEELS  429 
 140  HIGH TEMPERATURE ALLOYS  429

Type 427 Fractional - For Non-Ferrous Materials
Carbide Tipped
  • 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: (Prompt delivery)
  • 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
Tool Diameter Type 427
EDP NO.		 Fractional
Price		 Dimensions Finished To Modified Tool Diameter
Max. Shank Diam. No. of Flutes Length Modified Diameter Range Price Each - Based on Quantity Ordered
Frac. Dec. Flute Carbide Overall Low High 1 2 3 4 5-7 8-14*
   1/4   .2500 42708 $119.45  .2405 4 1  1/2     1/2  6          .2381  .2530 $148.80 $134.10 $129.20 $126.85 $124.30 $122.35
   9/32  .2813 42709 126.70  .2485 4 1  1/2     1/2  6          .2531  .2840 156.05 141.35 136.45 134.10 131.60 129.60
   5/16  .3125 42710 133.85  .2792 4 1  1/2  1  1/2  6          .2841  .3150 163.20 148.50 143.60 141.25 138.70 136.75
  11/32  .3438 42711 134.90  .2792 4 1  1/2  1  1/2  6          .3151  .3470 164.20 149.50 144.60 142.25 139.75 137.75
   3/8   .3750 42712 136.25  .3105 4 1  3/4  1  3/4  7          .3471  .3780 165.60 150.90 146.00 143.65 141.10 139.15
  13/32  .4063 42713 136.80  .3105 4 1  3/4  1  3/4  7          .3781  .4090 166.15 151.45 146.50 144.20 141.65 139.70
   7/16  .4375 42714 138.10  .3730 6 1  3/4  1  3/4  7          .4091  .4410 167.45 152.75 147.85 145.50 143.00 141.00
  15/32  .4688 42715 139.30  .3730 6 1  3/4  1  3/4  7          .4411  .4720 168.65 153.95 149.05 146.70 144.20 142.20
   1/2   .5000 42716 141.10  .4355 6 2         2         8          .4721  .5030 170.45 155.75 150.85 148.50 146.00 144.00
  17/32  .5313 42717 144.05  .4355 6 2         2         8          .5031  .5340 173.40 158.70 153.80 151.45 148.90 146.95
   9/16  .5625 42718 146.15  .4355 6 2         2         8          .5341  .5660 175.50 160.80 155.90 153.55 151.00 149.05
  19/32  .5938 42719 149.20  .4355 6 2         2         8          .5661  .5970 178.55 163.85 158.95 156.60 154.10 152.10
   5/8   .6250 42720 152.00  .5615 6 2  1/4  2  1/4  9          .5971  .6280 181.30 166.60 161.70 159.35 156.85 154.85
  21/32  .6563 42721 168.30  .5615 6 2  1/4  2  1/4  9          .6281  .6590 197.65 182.95 178.00 175.70 173.15 171.20
  11/16  .6875 42722 171.70  .5615 6 2  1/4  2  1/4  9          .6591  .6910 201.05 186.35 181.45 179.10 176.60 174.60
  23/32  .7188 42723 175.40  .5615 6 2  1/4  2  1/4  9          .6911  .7220 204.70 190.00 185.10 182.75 180.25 178.25
   3/4   .7500 42724 179.10  .6245 6 2  1/2  2  1/2  9  1/2   .7221  .7530 208.45 193.75 188.80 186.50 183.95 182.00
  25/32  .7813 42725 182.15  .6245 6 2  1/2  2  1/2  9  1/2   .7531  .7840 211.50 196.80 191.90 189.55 187.00 185.05
  13/16  .8125 42726 184.40  .6245 6 2  1/2  2  1/2  9  1/2   .7841  .8160 213.70 199.00 194.10 191.75 189.25 187.25
  27/32  .8438 42727 187.75  .6245 6 2  1/2  2  1/2  9  1/2   .8161  .8470 217.10 202.40 197.45 195.10 192.60 190.60
   7/8   .8750 42728 190.75  .7495 6 2  5/8  2  5/8  10          .8471  .8780 220.10 205.40 200.45 198.10 195.60 193.60
  29/32  .9063 42729 201.95  .7495 6 2  5/8  2  5/8  10          .8781  .9090 231.30 216.60 211.70 209.35 206.80 204.85
  15/16  .9375 42730 211.80  .7495 8 2  5/8  2  5/8  10          .9091  .9410 241.15 226.45 221.50 219.20 216.65 214.70
  31/32  .9688 42731 212.35  .7495 8 2  5/8  2  5/8  10          .9411  .9720 241.70 227.00 222.05 219.70 217.20 215.20
1         1.0000 42732 212.65  .8745 8 2  3/4  2  3/4  10  1/2   .9721 1.0030 242.00 227.30 222.35 220.00 217.50 215.50
1  1/16 1.0625 42734 224.80  .8745 8 2  3/4  2  3/4  10  1/2  1.0031 1.0660 254.15 239.45 234.55 232.20 229.70 227.70
1  1/8  1.1250 42736 225.80  .8745 8 2  7/8  2  7/8  11         1.0661 1.1280 255.10 240.40 235.50 233.15 230.65 228.65
1  3/16 1.1875 42738 235.10  .9995 8 2  7/8  2  7/8  11         1.1281 1.1905 264.40 249.70 244.80 242.45 239.95 237.95
1  1/4  1.2500 42740 238.20  .9995 8 3         3         11  1/2  1.1906 1.2530 267.55 252.85 247.90 245.60 243.05 241.10
1  5/16 1.3125 42742 245.05  .9995 8 3         3         11  1/2  1.2531 1.3155 274.40 259.70 254.75 252.40 249.90 247.90
1  3/8  1.3750 42744 254.95  .9995 8 3  1/4  3  1/4  12         1.3156 1.3780 284.30 269.60 264.65 262.30 259.80 257.80
1  7/16 1.4375 42746 262.90  .9995 8 3  1/4  3  1/4  12         1.3781 1.4405 292.25 277.55 272.65 270.30 267.80 265.80
1  1/2  1.5000 42748 271.75 1.2495 8 3  1/2  3  1/2  12  1/2  1.4406 1.5030 301.10 286.40 281.45 279.10 276.60 274.60
* Quantities of 15 or more - price of fractional size in same size range