Standard Tolerance

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Cobra Carbide continues to invest in state-of-the-art equipment such as Walters, Rolomatic, TrueTech and more. Each tool is designed and inspected to insure precision, consistency and everything you expect of a well-made tool. Our standard cutting tools are manufactured to the following tolerances:

  • Cutting Diameter on Standard End Mills: +.000/-.002

  • Cutting Diameter on Roughing End Mills: +.000/-.005

  • Ball Nose: +.000/-.002

  • Shank Diameter: -.0001/-.0004

  • Radius: +.001/-.001

  • Run-Out Tolerance: .0005 maximum shank to cutting diameter on all except Long Length

If you need tools designed to a different specification, we’ll be glad to help; Specials are one of our many stregths.

TOLERANCE CHART – Metric & Imperial

SHANK DIA (h6)CUTTING DIA (h10)
≤ 3 mm0/-0.006 mm≤ 3 mm0/-0.040 mm
> 3 ≤ 6 mm0/-0.008 mm> 3 ≤ 6 mm0/-0.048 mm
> 6 ≤ 10 mm0/-0.009 mm> 6 ≤ 10 mm0/-0.058 mm
> 10 ≤ 18 mm0/-0.011 mm> 10 ≤ 18 mm0/-0.070 mm
> 18 ≤ 30 mm0/-0.013 mm> 18 ≤ 30 mm0/-0.084 mm
> 30 ≤ 50 mm0/-0.016 mm> 30 ≤ 50 mm0/-0.100 mm
≤ 0.118 inch0/-0.00024 inch≤ 0.118 inch0/-0.0016 inch
> 0.118 ≤ 0.23620/-0.00031> 0.118 ≤ 0.23620/-0.0019
> 0.2362 ≤ 0.39370/-0.00035> 0.2362 ≤ 0.39370/-0.0023
> 0.3937 ≤ 0.70870/-0.00043> 0.3937 ≤ 0.70870/-0.0028
> 0.7087 ≤ 1.18110/-0.00051> 0.7087 ≤ 1.18110/-0.00331
> 1.1811 ≤ 1.98650/-0.00063> 1.1811 ≤ 1.98650/-0.00393
SHANK DIA (h6)CUTTING DIA (h7)
≤ 3 mm0/-0.006 mm≤ 3 mm0/-0.010 mm
> 3 ≤ 6 mm0/-0.008 mm> 3 ≤ 6 mm0/-0.012 mm
> 6 ≤ 10 mm0/-0.009 mm> 6 ≤ 10 mm0/-0.015 mm
> 10 ≤ 18 mm0/-0.011 mm> 10 ≤ 18 mm0/-0.018 mm
> 18 ≤ 30 mm0/-0.013 mm> 18 ≤ 30 mm0/-0.021 mm
> 30 ≤ 50 mm0/-0.016 mm> 30 ≤ 50 mm0/-0.025 mm
≤ 0.118 inch0/-0.00024 inch≤ 0.118 inch0/-0.00039 inch
> 0.118 ≤ 0.23620/-0.00031> 0.118 ≤ 0.23620/-0.00047
> 0.2362 ≤ 0.39370/-0.00035> 0.2362 ≤ 0.39370/-0.00059
> 0.3937 ≤ 0.70870/-0.00043> 0.3937 ≤ 0.70870/-0.00071
> 0.7087 ≤ 1.18110/-0.00051> 0.7087 ≤ 1.18110/-0.00083
> 1.1811 ≤ 1.98650/-0.00063> 1.1811 ≤ 1.98650/-0.00098
SHANK DIA (h6)CUTTING DIA (H6)
≤ 3 mm0/-0.006 mm≤ 3 mm
> 3 ≤ 6 mm0/-0.008 mm> 3 ≤ 6 mm0/+0.008
> 6 ≤ 10 mm0/-0.009 mm> 6 ≤ 10 mm0/+0.009
> 10 ≤ 18 mm0/-0.011 mm> 10 ≤ 18 mm0/+0.011
> 18 ≤ 30 mm0/-0.013 mm> 18 ≤ 30 mm0/+0.013
> 30 ≤ 50 mm0/-0.016 mm> 30 ≤ 50 mm0/+0.016
≤ 0.118 inch0/-0.00024 inch≤ 0.118 inch
> 0.118 ≤ 0.23620/-0.00031> 0.118 ≤ 0.23620/+0.00034
> 0.2362 ≤ 0.39370/-0.00035> 0.2362 ≤ 0.39370/+0.00035
> 0.3937 ≤ 0.70870/-0.00043> 0.3937 ≤ 0.70870/+0.00043
> 0.7087 ≤ 1.18110/-0.00051> 0.7087 ≤ 1.18110/+0.00051
> 1.1811 ≤ 1.98650/-0.00063> 1.1811 ≤ 1.98650/+0.00063
FOR 2 FLT AND 4 FLT END MILL STANDARD DRAWINGS
DIAMETERODENDFACE
INCHESMETRICPRIMARYSECONDARYPRIMARYSECONDARY
0.0156 – 0.118< 39 – 1316 – 2211 – 1520 – 26
0.118 – 0.3125= 3 < 89 – 1316 – 229 – 1316 – 22
0.343 – 0.4375= 8 < 126 – 1014 – 206 – 1014 – 20
0.50 – 0.6250= 12 < 165 – 914 – 205 – 914 – 20
0.6875 – 0.75= 16 < 204 – 813 – 204 – 813 – 20
0.875 – 1.0= 20 < 253 – 712 – 183 – 712 – 18

NOTE:

1) FOR DIAMETER LESS THAN 2MM SEC, OD ANGLE IS ZERO.

2) FOR 3,5,6 FLUTE TOOLS PRIMARY = 6° – 10°, SEC = 14° – 20°