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FAQ's |
Tolerances
for Cobalt 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,
4 |
Center
Cutting |
(+.0000
/ -.0015) |
(+.0000
/ -.0015) |
DP530,
DPC560 |
Single
End Finishers |
2,
4, 6, 8 |
**
All Except Heavy Duty |
(+.003
/ -.000) |
(+.001
/ -.000) |
EX350,
EXB350, EXL350, EXR350, EXX350, SP205, ST570, SP408,
SPC408, HPC188, STC550, SPB510, STB620, STB610, SPB540 |
Heavy
Duty
Finishers |
4,
6, 8 |
Heavy
Duty With 2" & 2-1/2" Diameter Shanks |
(+.005
/ -.000) |
(+.005
/ -.000) |
HDP790,
HDP890, HDPL890
** (All Single End Finishers With 2" & 2-1/2"
Dia. Shanks) |
Multi-Flute
Coarse Pitch Roughers |
4,
5, 6, 8, 10 |
1"
Ø & Under |
(+.025
/ -.005) |
(+.003
/ -.000) |
EXR350,
RMB700, RMB449, REM710, REC700, RXC753, REM445, REC448 |
1-1/8"
Ø & Over |
(+.006
/ -.000) |
All
3 Flute Coarse & Fine Pitch Roughers |
3 |
All
Sizes |
(+.025
/ -.005) |
(+.005
/ -.000) |
RTM713,
RHC752, RHLC754, RTM447 |
Truncated
Rougher/Finisher and Chipbreaker |
3,
4, 5, 6, 8 |
All
Sizes |
No
Specification |
(+.001
/ -.000) |
RFM442,
RFM440, RFM441, RFCB443, RFCB444 |
Metric
Finishers With Inch Shanks |
2,
4 |
All
Sizes |
No
Specification |
(+.001
/ -.000) |
SBM855,
SMM835, SMM845 |
Metric
Roughers With Inch Shanks |
3,
4, 5 |
All
Sizes |
No
Specification |
(+.003
/ -.000) |
SMMR865 |
2
Flute Metric Finishers With Metric Shanks |
2 |
Specification
per DIN 327-ANS |
No
Specification |
DIN
(e8) mm |
SBW855,
SMW835 |
4
Flute Metric Finishers With Metric Shanks |
4 |
Specification
per DIN 69 844-ANS |
No
Specification |
DIN
(k10) mm |
SMW845 |
Metric
Roughers With Metric Shanks |
3,
4, 5 |
Specification
per DIN 69 844-ANS |
No
Specification |
DIN
(k12) mm |
SMWR865 |
Shank
Diameter Tolerances |
| End
Mill Type |
Other
Specification |
ANSI*
Tolerance |
Niagara
Tolerance |
All
Inch Shanks |
|
(-.0001
/ -.005) |
(-.0001
/ -.005) |
All
Metric Shank |
Specification
per DIN 1835 Form B |
No
Specification |
DIN
(h6) mm |
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) |
All
Metric Shank |
Specification
per DIN ANS |
No
Specification |
(+0,7mm
/ -0) |
| 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) |
All
Metric Shank |
Specification
per DIN ANS |
No
Specification |
(+0,7mm
/ -0) |
* 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