Range Reamer Series 270 and 270L
270 Series - Straight flute standard reamer OD tolerance
270L Series - Right-hand cut, left-hand spiral flute for through-hole applications
All reamers above .0433” (1.09mm) are ground between centers for maximum concentricity

Series 270/270L OD Tolerance
Inch


 
Metric (mm)
D1 Tolerance D1 Tolerance
< 3/8 +.0001/+.0003 < 9.52 +.0025/+.0076
> 3/8 +.0001/+.0004 > 9.52 +.0025/+.0102


How to build a tool number for 270 and 270L range reamers
All range reamer tool numbers are in decimal inch sizes
 Series Size
270 .2362" (6mm)
8 digit tool no. - 27023620
 
Series Size
270L .0567"
8 digit tool no. 27005670L


 
Series 270 Series 270L Shank D2 OAL L1 Flute Length L2 # Flutes
Diameter D1
Inch mm Inch mm Inch mm Inch mm Inch mm
.0135-.0200 00.34-0.50 .0135-.0200 0.34-0.50 .0135-.0433 are no longer a standard item. 
Contact customer service for price and availability as
a special quoted item. 800.553.8024/563.391.6220 or sales@maford.com
.0201-.0400 00.51-1.01 .0201-.0400 0.51-1.01
.0401-.0433 01.02-1.09 .0401-.0433 1.02-1.09
.0434-.0519 01.10-1.31 .0434-.0519 1.10-1.31 .043 1.09 1-1/2 38 3/8 9.5 4
.0520-.0590 01.32-1.49 .0520-.0590 1.32-1.49 .046 1.17 1-1/2 38 3/8 9.5 4
.0591-.0660 01.50-1.67 .0591-.0660 1.50-1.67 .058 1.47 1-1/2 38 3/8 9.5 4
.0661-.0740 01.68-1.87 .0661-.0740 1.68-1.87 .065 1.65 1-3/4 44 1/2 12.5 4
.0741-.0810 01.88-2.05 .0741-.0810 1.88-2.05 .073 1.85 1-3/4 44 1/2 12.5 4
.0811-.0890 02.06-2.26 .0811-.0890 2.06-2.26 .080 2.03 2 51 1/2 12.5 4
.0891-.0970 02.27-2.46 .0891-.0970 2.27-2.46 .088 2.24 2 51 1/2 12.5 4
.0971-.1050 02.47-2.66 .0971-.1050 2.47-2.66 .096 2.44 2-1/4 57 5/8 16 4
.1051-.1130 02.67-2.87 .1051-.1130 2.67-2.87 .104 2.64 2-1/4 57 5/8 16 4
.1131-.1210 02.88-3.07 .1131-.1210 2.88-3.07 .112 2.84 2-1/4 57 5/8 16 4
.1211-.1280 03.08-3.25 .1211-.1280 3.08-3.25 .120 3.05 2-1/4 57 5/8 16 4
.1281-.1360 03.26-3.45 .1281-.1360 3.26-3.45 .127 3.23 2-1/2 64 3/4 19 4
.1361-.1440 03.46-3.65 .1361-.1440 3.46-3.65 .135 3.43 2-1/2 64 3/4 19 4
.1441-.1520 03.66-3.86 .1441-.1520 3.66-3.86 .143 3.63 2-1/2 64 3/4 19 4
.1521-.1590 03.87-4.03 .1521-.1590 3.87-4.03 .151 3.84 2-1/2 64 3/4 19 4
.1591-.1670 04.04-4.24 .1591-.1670 4.04-4.24 .158 4.01 2-3/4 70 7/8 22 4
.1671-.1750 04.25-4.44 .1671-.1750 4.25-4.44 .166 4.22 2-3/4 70 7/8 22 4
.1751-.1830 04.45-4.64 .1751-.1830 4.45-4.64 .174 4.42 2-3/4 70 7/8 22 4
.1831-.1910 04.65-4.85 .1831-.1910 4.65-4.85 .182 4.62 2-3/4 70 7/8 22 4
.1911-.1990 04.86-5.05 .1911-.1990 4.86-5.05 .190 4.83 3 76 1 25.5 4
.1991-.2060 05.06-5.23 .1991-.2060 5.06-5.23 .198 5.03 3 76 1 25.5 4
.2061-.2140 05.24-5.43 .2061-.2140 5.24-5.43 .205 5.21 3 76 1 25.5 4
.2141-.2220 05.44-5.63 .2141-.2220 5.44-5.63 .213 5.41 3 76 1 25.5 4
.2221-.2300 05.64-5.84 .2221-.2300 5.64-5.84 .221 5.61 3 76 1 25.5 4
.2301-.2370 05.85-6.01 .2301-.2370 5.85-6.01 .229 5.82 3 76 1 25.5 4
.2371-.2450 06.02-6.22 .2371-.2450 6.02-6.22 .236 5.99 3 76 1 25.5 4
.2451-.2530 06.23-6.42 .2451-.2530 6.23-6.42 .244 6.20 3 76 1 25.5 4
.2531-.2710 06.43-6.88 .2531-.2710 6.43-6.88 .252 6.40 3-1/4 83 1-1/8 28.5 6
.2711-.2860 06.89-7.26 .2711-.2860 6.89-7.26 .270 6.86 3-1/4 83 1-1/8 28.5 6
.2861-.3020 07.27-7.67 .2861-.3020 7.27-7.67 .285 7.24 3-1/4 83 1-1/8 28.5 6
.3021-.3180 07.68-8.07 .3021-.3180 7.68-8.07 .301 7.65 3-1/4 83 1-1/8 28.5 6
.3181-.3330 08.08-8.45 .3181-.3330 8.08-8.45 .317 8.05 3-1/2 89 1-1/4 32 6
.3331-.3490 08.46-8.86 .3331-.3490 8.46-8.86 .332 8.43 3-1/2 89 1-1/4 32 6
.3491-.3640 08.87-9.24 .3491-.3640 8.87-9.24 .348 8.84 3-1/2 89 1-1/4 32 6
.3641-.3860 09.25-9.80 .3641-.3860 9.25-9.80 .363 9.22 3-1/2 89 1-1/4 32 6
.3681-.4150 09.81-10.54     .380 9.65 3-1/2 89 1-1/4 32 6
.4151-.4450 10.55-11.30     .410 10.41 3-3/4 95 1-3/8 35 6
.4451-.4750 11.31-12.06     .440 11.18 3-3/4 95 1-3/8 35 6
.4751-.5100 12.07-12.95     .470 11.93 4 102 1-1/2 38 6
.5101-.5400 12.96-13.71     .505 12.83 4 102 1-1/2 38 6
.5401-.5700 13.72-14.47     .535 13.59 4 102 1-1/2 38 6
.5701-.6000 14.48-15.24     .565 14.35 4 102 1-3/4 44.5 6
.6001-.6350 15.25-16.13     .595 15.11 4 102 1-3/4 44.5 6


Range Reamer Series 270P
270P Series - Straight flute for high precision, tight tolerance holes
All reamers above .0433” (1.09mm) are ground between centers for maximum concentricity

Series 270P OD Tolerance
Inch
D1 Tolerance
.0434-.2530 +.0001/+.0000
.2531-.6350 +.0002/+.0000

 
How to build a tool number for 270P range reamers
All range reamer tool numbers are in decimal inch sizes
 Series Size
270P .2362" (6mm)
8 digit tool no. - 27023620P
 
Series Size
270P .0567"
8 digit tool no. - 27005670P


Series 270P Shank D2 OAL L1 Flute Length L2 # Flutes
Diameter D1
Inch mm Inch mm Inch mm Inch mm
.0434-.0519 01.10-1.31 .043 1.09 1-1/2 38 3/8 9.5 4
.0520-.0590 01.32-1.49 .046 1.17 1-1/2 38 3/8 9.5 4
.0591-.0660 01.50-1.67 .058 1.47 1-1/2 38 3/8 9.5 4
.0661-.0740 01.68-1.87 .065 1.65 1-3/4 44 1/2 12.5 4
.0741-.0810 01.88-2.05 .073 1.85 1-3/4 44 1/2 12.5 4
.0811-.0890 02.06-2.26 .080 2.03 2 51 1/2 12.5 4
.0891-.0970 02.27-2.46 .088 2.24 2 51 1/2 12.5 4
.0971-.1050 02.47-2.66 .096 2.44 2-1/4 57 5/8 16 4
.1051-.1130 02.67-2.87 .104 2.64 2-1/4 57 5/8 16 4
.1131-.1210 02.88-3.07 .112 2.84 2-1/4 57 5/8 16 4
.1211-.1280 03.08-3.25 .120 3.05 2-1/4 57 5/8 16 4
.1281-.1360 03.26-3.45 .127 3.23 2-1/2 64 3/4 19 4
.1361-.1440 03.46-3.65 .135 3.43 2-1/2 64 3/4 19 4
.1441-.1520 03.66-3.86 .143 3.63 2-1/2 64 3/4 19 4
.1521-.1590 03.87-4.03 .151 3.84 2-1/2 64 3/4 19 4
.1591-.1670 04.04-4.24 .158 4.01 2-3/4 70 7/8 22 4
.1671-.1750 04.25-4.44 .166 4.22 2-3/4 70 7/8 22 4
.1751-.1830 04.45-4.64 .174 4.42 2-3/4 70 7/8 22 4
.1831-.1910 04.65-4.85 .182 4.62 2-3/4 70 7/8 22 4
.1911-.1990 04.86-5.05 .190 4.83 3 76 1 25.5 4
.1991-.2060 05.06-5.23 .198 5.03 3 76 1 25.5 4
.2061-.2140 05.24-5.43 .205 5.21 3 76 1 25.5 4
.2141-.2220 05.44-5.63 .213 5.41 3 76 1 25.5 4
.2221-.2300 05.64-5.84 .221 5.61 3 76 1 25.5 4
.2301-.2370 05.85-6.01 .229 5.82 3 76 1 25.5 4
.2371-.2450 06.02-6.22 .236 5.99 3 76 1 25.5 4
.2451-.2530 06.23-6.42 .244 6.20 3 76 1 25.5 4
.2531-.2710 06.43-6.88 .252 6.40 3-1/4 83 1-1/8 28.5 6
.2711-.2860 06.89-7.26 .270 6.86 3-1/4 83 1-1/8 28.5 6
.2861-.3020 07.27-7.67 .285 7.24 3-1/4 83 1-1/8 28.5 6
.3021-.3180 07.68-8.07 .301 7.65 3-1/4 83 1-1/8 28.5 6
.3181-.3330 08.08-8.45 .317 8.05 3-1/2 89 1-1/4 32 6
.3331-.3490 08.46-8.86 .332 8.43 3-1/2 89 1-1/4 32 6
.3491-.3640 08.87-9.24 .348 8.84 3-1/2 89 1-1/4 32 6
.3641-.3860 09.25-9.80 .363 9.22 3-1/2 89 1-1/4 32 6
.3681-.4150 09.81-10.54 .380 9.65 3-1/2 89 1-1/4 32 6
.4151-.4450 10.55-11.30 .410 10.41 3-3/4 95 1-3/8 35 6
.4451-.4750 11.31-12.06 .440 11.18 3-3/4 95 1-3/8 35 6
.4751-.5100 12.07-12.95 .470 11.93 4 102 1-1/2 38 6
.5101-.5400 12.96-13.71 .505 12.83 4 102 1-1/2 38 6
.5401-.5700 13.72-14.47 .535 13.59 4 102 1-1/2 38 6
.5701-.6000 14.48-15.24 .565 14.35 4 102 1-3/4 44.5 6
.6001-.6350 15.25-16.13 .595 15.11 4 102 1-3/4 44.5 6