Bronco Tool Company

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TECHNICAL INFORMATION FOR DRILL BUSHINGS

INCHES Tolerance Specifications For Drills

I.D. SIZE (For Nominal)	I.D. TOLERANCE (Over Nominal)
Up to 0.25"	+0.0001" to +0.0004"
Over ¼" to ¾"	+0.0001 to +0.0005"
Over ¾" 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 ¼" to 1"	+0.0006" to +0.0010"
Over 1"	+0.0008" to +0.0012"

While other leading suppliers charge a higher price for any size considered a special, Bronco Tool will charge pricing for Specials almost similar to the Standard sizes. Please mention "Reamer Bushings" when ordering Reamer Bushings.

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

ORDERING AND FULFILLMENT PROCESS

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