Bronco Tool Company
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TECHNICAL INFORMATION FOR DRILL BUSHINGS
INCHES Tolerance Specifications For Drills
I.D. SIZE (For Nominal) ID TOLERANCE (Over Nominal)
Up to 0.25" +0.0001" to +0.0004"
Over 0.25" to 0.75" +0.0001 to +0.0005"
Over 0.75" to 1.5" +0.0002"to +0.0006"
Over 1.5" to 1.8750" +0.0003 to +0.0007"
 
INCHES Tolerance Specifications For Reamers
ID SIZE (For Nominal) ID TOLERANCE (Over Nominal)
Up to 0.25" +0.0005" to +0.0008"
Over 0.25 to 1" +0.0006" to +0.0010"
Over 1" +0.0008" to +0.0012"
 
METRIC Tolerances For Drills
ID SIZE (For Nominal) mm. ID TOLERANCE (Over Nominal) mm.
0.36 to 3.00 + 0.002 to +0.008
3.01 to 6.00 +0.004 to +0.012
6.01 to 10.00 +0.005 to +0.014
10.01 to 18.00 +0.006 to ++0.017
18.01 to 30.00 +0.007 to + 0.020
30.01 to 50.00 +0.009 to +0.025
50.01 to 55.00 +0.010 to +0.029
 
METRIC Tolerances For Reamers
ID SIZE (For Nominal) mm. ID TOLERANCE (Over Nominal) mm.
1.0 to 3.00 +0.006 to +0.012
3.01 to 6.00 +0.010 to +0.018
6.01 to 10.00 +0.013 to +0.022
10.00 to 18.00 +0.016 to +0.027
18.01 to 30.00 +0.020 to +0.033
 
CONCENTRICITY: ( Total indicator reading ).
STANDARD ID SIZE TOLERANCE
ANSI 1/8" to 1/2" 0.0 to 0.0003 T.I.R max
  Over 1/2" 0.0005" T.I.R. max
     
METRIC All Sizes 0 to 0.012 mm T.I.R.
T.I.R. = Total Indicator Readings


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Bronco Tool Company
1550 Opelika Road, Suite 6-114
Auburn, AL 36830
334 737 6023 • Fax: 334 737 6102

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