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FAQ's |
Tolerances
for High Speed Steel End Mills
Cutting Diameter Tolerances
|
End
Mill Style |
Number
of Flutes |
Type
of
Range |
ANSI*
Tolerance |
Niagara
Tolerance |
Corresponding
List Numbers |
Double
End
Finishers |
2,
3 & 3 |
Center
Cutting |
(+.0000/-.0015) |
(+.0000/-.0015) |
D201,
D400, DA206, DB260, DBS217, DC402, DL213, DL418, DLH590,
DR209, DR416, DS211, DS420, DSF290, DTF309 |
| 4
Flute Non-Center Cutting |
Flute
Smaller than Shank |
(+.003/-.000) |
(+.001/-.000) |
D400,
DLH589 |
Shank
& Flute Same Size |
(+.0000/-.0025) |
(+.0000/-.0015) |
Single
End
Finishers |
2 |
Stub
Length |
(+.0000/-.000) |
(+.0000/-.0015) |
A208,
A337, AB337, AB910, ACB337, AL337, ALL337, S203, S404,
SB207, SB470, SC406, SEB270, SEL250, SK204, SLH580,
SLRB601, SLRC602, SR208, SR414, STF320, SCF890, SLR600 |
2,
3, 4, 6, 8 |
All
Except Heavy Duty |
(+.003/-.000) |
(+.001/-.000) |
Heavy
Duty
Finishers |
2,
3, 4, 6, 8 |
Heavy
Duty with 2" & 2-1/2" Diameter Shanks |
(+.005/-.000) |
(+.005/-.000) |
HAC700,
HDA670, HDA740, HDA760, HDB590, HDB780, HDC650, HDC720,
HDC730, HDC770, HMC630 |
Metric
Finishers
With Inch Shanks |
2
& 4 |
All
Sizes |
No
Specification |
(+.001/-.000) |
SMM830,
SMM850 |
Shank
Diameter Tolerances |
| End
Mill Type |
Other
Specification |
ANSI*
Tolerance |
Niagara
Tolerance |
All
Inch Shanks |
|
(-.0001
/ -.005) |
(-.0001
/ -.005) |
Length-Of-Cut
Tolerances |
| End
Mill Type |
Other
Specification |
ANSI*
Tolerance |
Niagara
Tolerance |
All
Except
Heavy Duty |
|
(+.031
/ -.031) |
(+.031
/ -.000) |
Heavy
Duty |
|
(+.062
/ -.062) |
(+.062
/ -.000) |
| Over-All-Length
Tolerances |
| End
Mill Type |
Other
Specification |
ANSI*
Tolerance |
Niagara
Tolerance |
All
Except Heavy Duty
3" Diameter Flutes |
|
(+.062
/ -.062) |
(+.062
/ -.000) |
3"
Diameter Heavy Duty |
|
(+.125
/ -.125) |
(+.125
/ -.000) |
* Taken from table 77 of the USA Standards for Milling Cutters
and End Mills, ANSI B94.
19-1985 published by the American Society of Mechanical Engineers.
Note: All dimensions are in inches unless otherwise noted.
|
Niagara Cutter, Inc.
• 200 John James Audubon Pkwy • Amherst, NY 14228 USA