Tolerances

Solid Carbide End Mills


Cutting Diameter Tolerances
End Mill Style Number
of Flutes
Niagara Cutter Tolerance Corresponding List Numbers
Single-End / Double-End
Finishers
All +.000 / -.002 STS430, STR430, STB430, STRN430, STBN430, STS430M, STR430M, STB430M, STR440, STB440, STRN440, STBN440, STR440M, STB440M, STS540, STR540, STS540M, STR540M, A245, A245R, AB245, AN245, AN245R, ANB245, A340, AN340, A345, A345R, AN345, AN345R, A345M, S335, SB335, SN335, S545, S545R, S335M, S545M, S645M, C230, C230R, C330, C360, C430, C430R, CB230, CB330, CB430, C230M, C430M, CB230M, CB430M, C330M, CN430M, CD230, CD430, CSD230, CSD430, CSDB230, CSDB430
Single-End / Double-End
Finishers (Flute Dia <=7/64")
All +/- .0005 C230, CB230, CSD230, CSDB230, C330, CB330, C430, CB430, CSD430, CSDB430, C230M, CB230M, C330M, C430M, CB430M
Single-End
Finishers (NC Tolerance)
2 & 4 +.001 / - .000 CNC230, CNCB230, CNC430, CNCB430
Single-End
Roughers
3, 4 & 5 +.000 / -.003 AR330, SR420, SR545, SR420M
Single-End
Micro Decimal
2 & 4 + /- .0005 ME230, MES230, MEB230, MESB230, ME430, MES430, MEB430, MESB430
Thread Mills All +.000 / -.002 NTM100UN, NTM120UN, NTM160UN, NTM200NPT, NTM300NPTF, NTM400MI
Composite Cutting Tools All +.000 / -.002 DIACC, DIAEPB, DIAPPB, DIABEB, DIAMFR
Diamond Coated End Mills 2 & 4 +/- .001 DIA230, DIA430, DIAB230, DIACR430, DIAL230, DIAL430, DIALB230, DIALB430, DIAXR430, DIAXRB430, DIAXRR430, DIAXS430, DIAXSB430, DIAXSR430, DIA230M, DIAB230M, DIA430M, DIAB430M, DIACR430M
Mold and Die 6 +.000 / -.002 M645, M645R, MZ645, MZ645R, MZ645M, MZR645M
Mold and Die (Flute Dia < Shank Dia) 2 +/- .0005 MB215, MB215M, MBZ215, MBZ215M
Mold and Die (Flute Dia = Shank Dia) 2 +.000 / -.001 MB215, MB215M, MBZ215, MBZ215M
Ball-End All Ball radius tolerances: flute dia tolerances / 2 All
Corner Radius All +/- .001 All Series
Shank Diameter Tolerances
End Mill Style Niagara Cutter Tolerance
All Inch Shanks -.0001 / -.0004
All Metric Shanks h6
Length-Of-Cut Tolerances
End Mill Style Niagara Cutter Tolerance
All Except Micro Decimal +.030 / - 0
Micro Decimal .030 Dia and Under +.002 / -0
Micro Decimal .031 Dia and Above +.005 / -0
Overall Length Tolerances
End Mill Style Niagara Cutter Tolerance
All + .015, +/-.030
TIR Condition
End Mill Style Cutting Diameter Niagara Cutter Tolerance
All Except Roughers .005 thru .030 0.0001 Max
.031 thru .060 0.0002 Max
.061 thru .111 0.0003 Max
.112 and above 0.0005 Max
Roughers All 0.0010 Max
Back Taper
End Mill Style Niagara Cutter Tolerance
All .0005 Max Back Taper Per Inch permissible. Not to exceed the Cutting Diameter Tolerance.


All dimensions are in inches unless otherwise noted.