Slotting
High Performance End Mills: 4 flute Gorilla Mills® for Slotting Conditions
The cornerstone tool of the Gorilla Mill® line of variable helix, variable index, high performance end mills, the 4 flute Gorilla Mill® is relentless in slotting and profiling conditions.
We named these high speed machining end mills and cutting tools “Gorilla Mills®” for one reason, because they’re as tough as a big ‘ol ape! Full slotting with the correct speeds and feeds at 2x diameter depth is not out of the question. Full slot in and profile out, or rough and finish with one 4 flute Gorilla Mill®. Machine steels, stainless, cast or ductile iron and exotic alloys.
Patent pending 4 flute Gorilla Mills® are stocked in standard length, stub, long and extra long, flat, radius and ball nose.
Contact us to quote your special Gorilla Mill® end mill and cutting tool application.
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Gorilla Mills - 4 Flute Standard Flat End
| Diameter |
LOC |
OAL |
Item # (4FL) |
 |
| 1/8 |
1/2 |
1-1/2 |
GM18F4 |
| 3/16 |
5/8 |
2 |
GM316F4 |
| 1/4 |
3/4 |
2-1/2 |
GM14F4 |
| 5/16 |
7/8 |
2-1/2 |
GM516F4 |
| 3/8 |
7/8 |
2-1/2 |
GM38F4 |
| 7/16 |
1 |
2-1/2 |
GM716F4 |
| 1/2 |
1-1/4 |
3 |
GM12F4 |
| 5/8 |
1-1/4 |
3-1/2 |
GM58F4 |
| 3/4 |
1-1/2 |
4 |
GM34F4 |
| 1 |
1-1/2 |
4 |
GM10F4 |
Gorilla Mills - 4 Flute Standard Radius
| Diameter |
LOC |
OAL |
Corner Radius |
Item # (4FL) |
 |
| 1/8 |
1/2 |
1-1/2 |
.015-.02 |
GM18R4 |
| 3/16 |
5/8 |
2 |
.015-.02 |
GM316R4 |
| 1/4 |
3/4 |
2-1/2 |
.015-.02 |
GM14R4 |
| 5/16 |
7/8 |
2-1/2 |
.015-.02 |
GM516R4 |
| 3/8 |
7/8 |
2-1/2 |
.015-.02 |
GM38R4 |
| 7/16 |
1 |
2-1/2 |
.015-.02 |
GM716R4 |
| 1/2 |
1 |
3 |
.025-.03 |
GM12R4 |
| 5/8 |
1-1/4 |
3-1/2 |
.035-.04 |
GM58R4 |
| 3/4 |
1-1/2 |
4 |
.035-.04 |
GM34R4 |
| 1 |
1-1/2 |
4 |
.035-.04 |
GM10R4 |
Gorilla Mills - 4 Flute Stub Length Flat End
| Diameter |
LOC |
OAL |
Item # (4FL) |
 |
| 1/8 |
1/4 |
1-1/2 |
GM18FS4 |
| 3/16 |
3/8 |
2 |
GM316FS4 |
| 1/4 |
1/2 |
2-1/2 |
GM14FS4 |
| 5/16 |
1/2 |
2-1/2 |
GM516FS4 |
| 3/8 |
5/8 |
2-1/2 |
GM38FS4 |
| 7/16 |
1 |
2-1/2 |
GM716FS4 |
| 1/2 |
5/8 |
3 |
GM12FS4 |
| 5/8 |
3/4 |
3-1/2 |
GM58FS4 |
| 3/4 |
1 |
4 |
GM34FS4 |
| 1 |
1 |
4 |
GM10FS4 |
Gorilla Mills - 4 Flute Stub Length, Radius End
*Non Stock Standard 3 to 4 wks.
| Diameter |
LOC |
OAL |
Corner Radius |
Item # (4FL) |
 |
| 1/8 |
1/4 |
1-1/2 |
.015-.02 |
GM18RS4 |
| 3/16 |
3/8 |
2 |
.015-.02 |
GM316RS4 |
| 1/4 |
1/2 |
2-1/2 |
.015-.02 |
GM14RS4 |
| 5/16 |
1/2 |
2-1/2 |
.015-.02 |
GM516RS4 |
| 3/8 |
5/8 |
2-1/2 |
.015-.02 |
GM38RS4 |
| 1/2 |
5/8 |
3 |
.025-.03 |
GM12RS4 |
| 5/8 |
3/4 |
3-1/2 |
.035-.04 |
GM58RS4 |
| 3/4 |
1 |
4 |
.035-.04 |
GM34RS4 |
| * 1 |
1 |
4 |
.035-.04 |
GM10RS4 |
Gorilla Mills - 4 Flute Radius End Long, XL and Super Long
*Non Stock Standard 3 to 4 wks.
| Diameter |
LOC |
OAL |
Corner Radius |
Item # (4FL) |
 |
| *1/8 |
1 |
3 |
.015-.02 |
GM18RL4 |
| * 3/16 |
1-1/4 |
3 |
.015-.02 |
GM316RL4 |
| 1/4 |
1-1/4 |
3 |
.015-.02 |
GM14RL4 |
| * 1/4 |
1-1/2 |
4 |
.015-.02 |
GM14RXL4 |
| * 1/4 |
3 |
6 |
.015-.02 |
GM14RSL4 |
| * 5/16 |
1-1/4 |
3 |
.015-.02 |
GM516RL4 |
| * 5/16 |
1-1/2 |
4 |
.015-.02 |
GM516RXL4 |
| 3/8 |
1-1/8 |
3 |
.015-.02 |
GM38RL4 |
| 3/8 |
2 |
4 |
.015-.02 |
GM38RXL4 |
| * 3/8 |
3 |
6 |
.015-.02 |
GM38RSL4 |
| 1/2 |
1-1/2 |
4 |
.025-.03 |
GM12RL4 |
| 1/2 |
2 |
4 |
.025-.03 |
GM12RXL4 |
| * 1/2 |
3 |
6 |
.025-.03 |
GM12RSL4 |
| 5/8 |
2 |
4 |
.035-.04 |
GM58RL4 |
| * 5/8 |
3 |
6 |
.035-.04 |
GM58RXL4 |
| 3/4 |
2 |
4 |
.035-.04 |
GM34RL4 |
| 3/4 |
3 |
6 |
.035-.04 |
GM34RXL4 |
| 1 |
2 |
4 |
.035-.04 |
GM10RL4 |
| 1 |
3 |
6 |
.035-.04 |
GM10RXL4 |
Gorilla Mills - 4 Flute Flat End Long, XL and Super Long
*Non Stock Standard 3 to 4 wks.
| Diameter |
LOC |
OAL |
Item # (4FL) |
 |
| 1/8 |
1 |
3 |
GM18FL4 |
| 3/16 |
1-1/4 |
3 |
GM316FL4 |
| 1/4 |
1-1/4 |
3 |
GM14FL4 |
| 1/4 |
1-1/2 |
4 |
GM14FXL4 |
| * 1/4 |
3 |
6 |
GM14FSL4 |
| 5/16 |
1-1/4 |
3 |
GM516FL4 |
| * 5/16 |
1-1/2 |
4 |
GM516FXL4 |
| 3/8 |
1-1/8 |
3 |
GM38FL4 |
| 3/8 |
2 |
4 |
GM38FXL4 |
| * 3/8 |
3 |
6 |
GM38FSL4 |
| 1/2 |
1-1/2 |
4 |
GM12FL4 |
| 1/2 |
2 |
4 |
GM12FXL4 |
| 1/2 |
3 |
6 |
GM12FSL4 |
| 5/8 |
2 |
4 |
GM58FL4 |
| * 5/8 |
3 |
6 |
GM58FXL4 |
| 3/4 |
2 |
4 |
GM34FL4 |
| 3/4 |
3 |
6 |
GM34FXL4 |
| 1 |
2 |
4 |
GM10FL4 |
| 1 |
3 |
6 |
GM10FXL4 |
Gorilla Mills - 4 Flute Standard Ballnose
| Diameter |
LOC |
OAL |
Item # (4FL) |
 |
| 1/8 |
1/2 |
1-1/2 |
GM18B4 |
| 3/16 |
5/8 |
2 |
GM316B4 |
| 1/4 |
3/4 |
2-1/2 |
GM14B4 |
| 5/16 |
7/8 |
2-1/2 |
GM516B4 |
| 3/8 |
7/8 |
2-1/2 |
GM38B4 |
| 1/2 |
1 |
3 |
GM12B4 |
| 5/8 |
1-1/4 |
3-1/2 |
GM58B4 |
| 3/4 |
1-1/2 |
4 |
GM34B4 |
| 1 |
1-1/2 |
4 |
GM10B4 |
Gorilla Mills - 4 Flute Keyseat Milling Cutters, Flat End
Made to order 3 to 4 wks
| Diameter |
Width |
Neck Dia. |
OAL |
Item # (4FL) |
VARIABLE
 |
| 1/4 |
1/16 |
0.125 |
2-1/2 |
GMK14F1164 |
| 3/8 |
1/16 |
0.225 |
2-1/2 |
GMK38F1164 |
| 3/8 |
3/32 |
0.225 |
2-1/2 |
GMK38F3324 |
| 3/8 |
1/8 |
0.225 |
2-1/2 |
GMK38F184 |
| 1/2 |
1/16 |
0.250 |
3 |
GMK12F1164 |
| 1/2 |
3/32 |
0.250 |
3 |
GMK12F3324 |
| 1/2 |
1/8 |
0.250 |
3 |
GMK12F184 |
| 5/8 |
3/32 |
0.375 |
3-1/2 |
GMK58F3324 |
| 5/8 |
1/8 |
0.375 |
3-1/2 |
GMK58F184 |
| 5/8 |
5/32 |
0.375 |
3-1/2 |
GMK58F5324 |
| 5/8 |
3/16 |
0.375 |
3-1/2 |
GMK58F3164 |
| 3/4 |
1/8 |
0.500 |
4 |
GMK34F184 |
| 3/4 |
5/32 |
0.500 |
4 |
GMK34F5324 |
| 3/4 |
3/16 |
0.500 |
4 |
GMK34F3164 |
| 3/4 |
1/4 |
0.500 |
4 |
GMK34F144 |
| 1 |
3/16 |
0.625 |
4 |
GMK10F3164 |
| 1 |
7/32 |
0.625 |
4 |
GMK10F7324 |
| 1 |
1/4 |
0.625 |
4 |
GMK10F144 |
| 1 |
5/16 |
0.625 |
4 |
GMK10F5164 |
| 1 |
3/8 |
0.625 |
4 |
GMK10F384 |
Gorilla Mills - 4 Flute Keyseat Milling Cutters, Radius End
Made to order 3 to 4 wks
| Diameter |
Width |
Neck Dia. |
OAL |
Radius |
Item # (4FL) |
VARIABLE
 |
| 1/4 |
1/16 |
0.125 |
2-1/2 |
.015-.02 |
GMK14R1164 |
| 3/8 |
1/16 |
0.225 |
2-1/2 |
.015-.02 |
GMK38R1164 |
| 3/8 |
3/32 |
0.225 |
2-1/2 |
.015-.02 |
GMK38R3324 |
| 3/8 |
1/8 |
0.225 |
2-1/2 |
.015-.02 |
GMK38R184 |
| 1/2 |
1/16 |
0.250 |
3 |
.025-.03 |
GMK12R1164 |
| 1/2 |
3/32 |
0.250 |
3 |
.025-.03 |
GMK12R3324 |
| 1/2 |
1/8 |
0.250 |
3 |
.025-.03 |
GMK12R184 |
| 5/8 |
3/32 |
0.375 |
3-1/2 |
.035-.04 |
GMK58R3324 |
| 5/8 |
1/8 |
0.375 |
3-1/2 |
.035-.04 |
GMK58R184 |
| 5/8 |
5/32 |
0.375 |
3-1/2 |
.035-.04 |
GMK58R5324 |
| 5/8 |
3/16 |
0.375 |
3-1/2 |
.035-.04 |
GMK58R3164 |
| 3/4 |
1/8 |
0.500 |
4 |
.035-.04 |
GMK34R184 |
| 3/4 |
5/32 |
0.500 |
4 |
.035-.04 |
GMK34R5324 |
| 3/4 |
3/16 |
0.500 |
4 |
.035-.04 |
GMK34R3164 |
| 3/4 |
1/4 |
0.500 |
4 |
.035-.04 |
GMK34R144 |
| 1 |
3/16 |
0.625 |
4 |
.035-.04 |
GMK10R3164 |
| 1 |
7/32 |
0.625 |
4 |
.035-.04 |
GMK10R7324 |
| 1 |
1/4 |
0.625 |
4 |
.035-.04 |
GMK10R144 |
| 1 |
5/16 |
0.625 |
4 |
.035-.04 |
GMK10R5164 |
| 1 |
3/8 |
0.625 |
4 |
.035-.04 |
GMK10R384 |
Slotting (4 Flute)