COBRA

Standard Tolerances

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

FOR 2 FLT AND 4 FLT END MILL STANDARD DRAWINGS
DIAMETER OD ENDFACE
INCHES METRIC PRIMARY SECONDARY PRIMARY SECONDARY
0.0156 - 0.118 < 3 9 - 13 16 - 22 11 - 15 20 - 26
0.118 - 0.3125 = 3 < 8 9 - 13 16 - 22 9 - 13 16 - 22
0.343 - 0.4375 = 8 < 12 6 - 10 14 - 20 6 - 10 14 - 20
0.50 - 0.6250 = 12 < 16 5 - 9 14 - 20 5 - 9 14 - 20
0.6875 - 0.75 = 16 < 20 4 - 8 13 - 20 4 - 8 13 - 20
0.875 - 1.0 = 20 < 25 3 - 7 12 - 18 3 - 7 12 - 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°