H.S.S. Rotary Files (Burrs)

Midget Mills® — M2 High-Speed Steel, Rockwell 63-65. Made in USA Since 1931

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The Original Ground Rotary File

Invented by Rollin M. Severance in 1931, Midget Mills revolutionized precision deburring and finishing operations.

H.S.S. Midget Mills® — Right hand spiral tooth pattern with a light chipbreaker originated by Severance Tool. These tools can take more shock than carbide. Mainly used on non-work hardening materials. Material applications can include M2, M42, cold and hot roll steels, aluminum, cast iron and bronze.

Severance Midget Mills are precision ground rotary files designed for deburring, finishing, and shaping operations. Unlike stamped or milled burs, each Midget Mill is individually ground to exacting tolerances, ensuring consistent performance and extended tool life.

"We are the originators; we have been copied but not surpassed."

Ordering Tip

All tools are ordered by their EDP Number (Electronic Data Processing). Find your tool in the tables below and use the EDP number when placing orders.

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Midget Mills - Ground Rotary Files
Key Features
  • Precision ground flutes
  • Available in 24 shapes (A-Z, FL)
  • M2 High-Speed Steel
  • 1/4" standard shank
  • Resharpenable
  • Made in USA

Midget Mills® Identification System

Midget Mills are identified by a three-letter "tool number" that describes the tool's diameter, length, and shape.

First Letter - Diameter
  • A - 1/8"
  • B - 3/16"
  • C - 1/4"
  • D - 5/16"
  • E - 3/8"
  • F - 7/16"
  • G - 1/2"
  • H - 9/16"
  • I - 5/8"
  • J - 3/4"
  • K - 7/8"
  • L - 1"
Second Letter - Length
  • A - 1/8"
  • C - 1/4"
  • E - 3/8"
  • G - 1/2"
  • I - 5/8"
  • J - 3/4"
  • L - 1"
  • N - 1-1/4"
  • P - 1-1/2"
  • R - 1-3/4"
  • S - 2"
  • X - 4"
Third Letter - Shape
  • A - Cylindrical Square End
  • B - Ball
  • C - Cylindrical Rounded
  • D - Cylindrical w/Radius
  • E-M - Tapered (various angles)
  • N - Inverted Cone
  • P - Pear
  • Q - Olive
  • R - Tree (Radius Nose)
  • S - Tree (Small Radius)
  • T - Tree (Pointed)
  • U - Concave
  • V - Convex
  • W - Radius End Only
  • X - Double Angle
  • BI - Bi-Convex
  • FL - Flame
Example: CJA-EC-W

C = 1/4" diameter | J = 3/4" flute length | A = Cylindrical Square End | EC = End Cutting | W = Carbide (Tungsten)

H.S.S. Midget Mills®

Material

Premium M2 High-Speed Steel hardened to Rockwell 63-65. Ideal for general-purpose deburring on steel, aluminum, brass, and plastics.

Cut Patterns

  • Standard Cut — general-purpose deburring and finishing
  • End Cutting (-EC) — adds plunge cutting capability

Looking for carbide? See Midget Mills® (All Materials).

Shape A - Cylindrical Square End

Midget Mill Shape A - Cylindrical Square End diagram

Cylindrical shape with flat end. The most versatile shape for general deburring, side cutting, and surface finishing. Ideal for flat surfaces, slots, and keyways.

HSS Standard Cut
Head Dia.Flute LengthTool NameHSS EDP
1/8" 1/2" AGA 22930
1/8" 3/4" AJA 22931
1/8" 1" ALA 22932
1/8" 1-1/4" ANA 22933
1/8" 1-1/2" APA 22934
3/16" 1/2" BGA 22935
3/16" 3/4" BJA 22936
3/16" 1" BLA 22937
1/4" 1/2" CGA 22938
1/4" 1" CLA 22939
1/4" 1-1/2" CPA 22940
1/4" 1-3/4" CRA 22941
5/16" 1" DLA 22942
3/8" 3/4" EJA 22943
3/8" 1" ELA 22944
3/8" 1-1/2" EPA 22945
3/8" 2" ESA 22946
7/16" 1" FLA 22947
1/2" 1/2" GGA 22948
1/2" 1" GLA 22949
1/2" 1-1/4" GNA 22950
1/2" 1-1/2" GPA 22951
1/2" 2" GSA 22952
5/8" 1" ILA 22953
3/4" 1/2" JGA 22954
3/4" 3/4" JJA 22955
3/4" 1" JLA 22956
3/4" 1-1/4" JNA 22957
1" 1/4" LCA 22958
1" 1" LLA 22959
HSS End Cutting (-EC)

Same head diameters as standard tools. End cut (-EC) for plunge cutting capability.

Tool NameHSS EDP
AGA-EC22960
AJA-EC22961
ALA-EC22962
ANA-EC22963
APA-EC22964
BGA-EC22965
BJA-EC22966
BLA-EC22967
CGA-EC22968
CLA-EC22969
CPA-EC22970
CRA-EC22971
DLA-EC22972
EJA-EC22973
ELA-EC22974
EPA-EC22975
ESA-EC22976
FLA-EC22977
GGA-EC22978
GLA-EC22979
GNA-EC22980
GPA-EC22981
GSA-EC22982
ILA-EC22983
JGA-EC22984
JJA-EC22985
JLA-EC22986
JNA-EC22987
LCA-EC22988
LLA-EC22989

Shape B - Ball

Midget Mill Shape B - Ball diagram

Spherical head for deburring holes, contoured surfaces, and concave shapes. The ball diameter equals the head diameter.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 1/8" AAB 22990
3/16" 3/16" BBB 22991
1/4" 1/4" CCB 22992
5/16" 5/16" DDB 22993
3/8" 3/8" EEB 22994
7/16" 7/16" FFB 22995
1/2" 1/2" GGB 22996
9/16" 9/16" HHB 22997
5/8" 5/8" IIB 22998
3/4" 3/4" JJB 22999
7/8" 7/8" KKB 23000
1" 1" LLB 23001
1-1/4" 1-1/4" NNB 23002

Shape C - Cylindrical Radius End

Midget Mill Shape C - Cylindrical Radius End diagram

Cylindrical shape with a radius on the end. Combines side cutting ability with smooth radius transitions. For filleting, channeling, and creating radii.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 1/2" AGC 23003
3/16" 1/2" BGC 23004
1/4" 1" CLC 23005
1/4" 1-1/2" CPC 23006
1/4" 2-1/2" CUC 23007
5/16" 1" DLC 23008
3/8" 1" ELC 23009
3/8" 1-1/2" EPC 23010
7/16" 1" FLC 23011
1/2" 1" GLC 23012
1/2" 1-1/2" GPC 23013
5/8" 1" ILC 23014
3/4" 1" JLC 23015
3/4" 1-1/4" JNC 23016
3/4" 1-1/2" JPC 23017
1" 1-3/8" LOC 23018

Shape D - Cylindrical with Radius

Midget Mill Shape D - Cylindrical with Radius diagram

Ball shape with specified radii. Used for precision radius work and creating specific radii in workpieces.

Head Dia.Flute LengthRadiusTool NameHSS EDP
1/2" 1/2" 1/32" GGD-1/32R 23019
1/2" 1/2" 1/16" GGD-1/16R 23020
1/2" 1/2" 3/32" GGD-3/32R 23021
1/2" 1/2" 1/8" GGD-1/8R 23022
3/4" 3/4" 1/16" JJD-1/16R 23023
3/4" 3/4" 1/8" JJD-1/8R 23024
3/4" 3/4" 3/16" JJD-3/16R 23025
3/4" 3/4" 1/4" JJD-1/4R 23026

Shape E - Tapered 20°

Tapered (cone) Midget Mill® with a 20° taper per side, 40° included angle. The widest Severance taper, suited to wide chamfers, countersink blending, and deburring broad tapered openings.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 3/16" ABE 23080
3/16" 3/16" BBE 23081
1/4" 5/16" CDE 23082
3/8" 1/2" EGE 23083
1/2" 3/8" GEE 23084
1/2" 1/2" GGE 23085
3/4" 3/4" JJE 23086

Shape F - Tapered 18°

Tapered (cone) Midget Mill® with an 18° taper per side, 36° included angle. A wide taper for chamfer blending and deburring generous tapered openings.

Head Dia. Flute Length Tool Name HSS EDP
5/16" 3/8" DEF 23087
3/8" 3/8" EEF 23088
3/8" 9/16" EHF 23089
1/2" 7/16" GFF 23090
1/2" 5/8" GIF 23091
5/8" 3/4" IJF 23092
5/8" 7/8" IKF 23093
3/4" 7/8" JKF 23094
3/4" 1" JLF 23095
1" 1" LLF 23096
1" 1-3/8" LOF 23097

Shape G - Tapered 16°

Tapered (cone) Midget Mill® with a 16° taper per side, 32° included angle. Medium-wide taper for tapered bore finishing, V-groove deburring, and chamfer blending.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 3/16" ABG 23098
5/16" 3/8" DEG 23099
3/8" 7/16" EFG 23100
3/8" 5/8" EIG 23101
1/2" 1/2" GGG 23102
5/8" 3/4" IJG 23103
3/4" 3/4" JJG 23104

Shape H - Tapered 14°

Tapered (cone) Midget Mill® with a 14° taper per side, 28° included angle. Medium taper for general tapered deburring and reaching into narrowing openings. Also ground as an 8-inch long shank tool.

Head Dia. Flute Length Tool Name HSS EDP
3/16" 5/16" BDH 23105
5/16" 5/8" DIH 23106
1/4" 1/2" CGH 23107
3/8" 1/2" EGH 23108
3/8" 3/4" EJH 23109
1/2" 9/16" GHH 23110
1/2" 7/8" GKH 23111
5/8" 3/4" IJH 23112

Shape I - Tapered 12°

Tapered (cone) Midget Mill® with a 12° taper per side, 24° included angle. Medium taper for tapered holes and angled surfaces where a slimmer profile is needed.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 5/16" CDI 23113
3/8" 1/2" EGI 23114
3/8" 5/8" EII 23115
1/2" 5/8" GII 23116
1/2" 1" GLI 23117
5/8" 3/4" IJI 23118
3/4" 9/16" JHI 23119

Shape J - Tapered 10°

Tapered (cone) Midget Mill® with a 10° taper per side, 20° included angle. Slim taper for deeper tapered holes and narrow openings. Available as a long shank tool, and as the industry SM (cone, pointed nose) equivalent in Ecarno-Mills™.

Head Dia. Flute Length Tool Name HSS EDP
3/16" 3/8" BEJ 23120
1/4" 5/16" CDJ 23121
1/4" 1/2" CGJ 23122
5/16" 3/4" DJJ 23123
3/8" 1/2" EGJ 23124
3/4" 5/8" JIJ 23125
3/4" 1" JLJ 23126
1" 2-1/2" LUJ 23127
1" 3/4" LJJ 23128

Shape K - Tapered 8-1/2°

Tapered (cone) Midget Mill® with an 8-1/2° taper per side, 17° included angle. Slim taper for deep, narrow tapered openings and detail work.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 3/8" AEK 23129
1/4" 3/8" CEK 23130
1/4" 3/4" CJK 23131
1/4" 5/8" CIK 23132
5/16" 3/4" DJK 23133
3/8" 1" ELK 23134
1/2" 1-1/4" GNK 23135

Shape L - Tapered 7°

Tapered (cone) Midget Mill® with a 7° taper per side, 14° included angle. Slender taper for deep tapered holes and slots. Available as a long shank tool, and as the industry SL equivalent in Ecarno-Mills™.

Head Dia. Flute Length Tool Name HSS EDP
3/16" 5/8" BIL 23136
1/4" 3/4" CJL 23137
5/16" 3/4" DJL 23138
3/8" 1" ELL 23139
1/2" 1-1/4" GNL 23140
5/8" 3/4" IJL 23141
5/8" 7/8" IKL 23142

Shape M - Tapered 5°

Tapered (cone) Midget Mill® with a 5° taper per side, 10° included angle. The slimmest Severance taper, for deep, narrow openings and fine detail work.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 1/2" AGM 23143
3/16" 3/4" BJM 23144
1/4" 7/8" CKM 23145
1/4" 1-1/4" CNM 23146
3/8" 1" ELM 23147
3/8" 1-3/4" ERM 23148
1/2" 3/4" GJM 23149
1/2" 1" GLM 23150
1/2" 1-1/4" GNM 23151

Shape N - Inverted Cone

Midget Mill Shape N - Inverted Cone diagram

Inverted cone shape with 5° to 18° C/L angle. For undercuts, back chamfering, and deburring back side of holes. Most commonly used without optional end cut.

HSS Standard
Head Dia.Flute LengthIncluded AngleTool NameHSS EDP
1/4"1/8"36°CAN23152
1/4"3/16"28°CBN23153
1/4"1/4"20°CCN23154
1/4"3/8"14°CEN23155
1/4"1/2"10°CGN23156
3/8"3/16"36°EBN23157
3/8"1/4"28°ECN23158
3/8"5/16"20°EDN23159
3/8"1/2"10°EGN23160
1/2"3/8"20°GEN23161
1/2"1/2"14°GGN23162
1/2"1"14°GLN23163
1/2"1-1/8"10°GMN23164
5/8"3/8"36°IEN23165
5/8"1/2"28°IGN23166
3/4"1/2"36°JGN23167
3/4"5/8"36°JIN23168
HSS End-Cutting (-EC)

Same dimensions as standard tools above. End-cutting version adds cutting teeth on the end face.

Tool NameHSS EDP
CAN-EC23169
CBN-EC23170
CCN-EC23171
CEN-EC23172
CGN-EC23173
EBN-EC23174
ECN-EC23175
EDN-EC23176
EGN-EC23177
GEN-EC23178
GGN-EC23179
GLN-EC23180
GMN-EC23181
IEN-EC23182
IGN-EC23183
JGN-EC23184
JIN-EC23185

Shape P - Pear

Midget Mill Shape P - Pear diagram

Pear or bud shaped head for blend work and contoured surfaces requiring smooth transitions.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 5/16" CDP 23027
5/16" 3/8" DEP 23028
3/8" 7/16" EFP 23029
1/2" 5/8" GIP 23030
5/8" 1" ILP 23031

Shape Q - Olive

Olive (elliptical) shaped head for smooth contour blending and radiused groove deburring. The continuous curved profile prevents sharp transitions.

Head Dia. Flute Length Tool Name HSS EDP
3/16" 5/16" BDQ 23032
1/4" 7/16" CFQ 23033
5/16" 1/2" DGQ 23034
3/8" 5/8" EIQ 23035
3/8" 3/4" EJQ 23036
1/2" 7/8" GKQ 23037
5/8" 1" ILQ 23038
3/4" 1" JLQ 23039
1" 1-3/8" LOQ 23040

Shape R - Tree (Round Nose)

Tree shape with a rounded nose. Tapered body for reaching into cavities with a radiused end that prevents gouging. Excellent for die work and mold finishing.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 7/16" AFR 23041
3/16" 5/16" BDR 23042
3/16" 1/2" BGR 23043
1/4" 3/8" CER 23044
1/4" 3/4" CJR 23045
1/4" 1" CLR 23046
3/8" 7/16" EFR 23047
3/8" 3/4" EJR 23048
3/8" 1" ELR 23049
1/2" 1" GLR 23050
1/2" 1-1/8" GMR 23051
5/8" 5/8" IIR 23052
5/8" 1-1/8" IMR 23053
3/4" 3/4" JJR 23054
3/4" 1" JLR 23055
3/4" 1-1/4" JNR 23056
3/4" 1-3/8" JOR 23057
1-1/8" 1-3/4" MRR 23058
1-1/4" 2" NSR 23059
1/2" 3/4" GJR 23078

Shape S - Tree (Small Radius)

Tree shape with a smaller radius nose than Shape R. For tighter detail work in die cavities and mold finishing where a sharper transition is needed.

Head Dia. Flute Length Tool Name HSS EDP
1/8" 3/8" AES 23060
3/16" 1/2" BGS 23061
1/4" 3/4" CJS 23062
3/8" 3/4" EJS 23063
1/2" 1" GLS 23064
5/8" 1-1/8" IMS 23065
3/4" 1-1/4" JNS 23066
1" 1-5/8" LQS 23067
1-1/4" 2" NSS 23068

Shape T - Tree (Pointed)

Tree shape with a pointed end for reaching into tight corners and sharp internal angles. The tapered body with pointed tip accesses areas other shapes cannot reach.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 1/2" CGT 23069
1/4" 3/4" CJT 23070
3/8" 5/8" EIT 23071
3/8" 3/4" EJT 23072
1/2" 3/4" GJT 23073
1/2" 1" GLT 23074
1/2" 1-1/8" GMT 23075
5/8" 1" ILT 23076
3/4" 1" JLT 23077

Shape U - Concave

Midget Mill Shape U - Concave diagram

Concave (undercut) shape for deburring and finishing inside radii. Generates a radius on the outside edge of the workpiece.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 1/8" CAU 23186
1/4" 3/16" CBU 23187
1/4" 1/4" CCU 23188
5/16" 3/16" DBU 23189
3/8" 1/8" EAU 23190
3/8" 3/16" EBU 23191
3/8" 1/4" ECU 23192
3/8" 5/16" EDU 23193
7/16" 1/4" FCU 23194
1/2" 1/4" GCU 23195
1/2" 5/16" GDU 23196
1/2" 3/8" GEU 23197
1/2" 7/16" GFU 23198
5/8" 1/2" IGU 23199
3/4" 3/8" JEU 23200
3/4" 7/16" JFU 23201
3/4" 1/2" JGU 23202
3/4" 5/8" JIU 23203
7/8" 5/8" KIU 23204
7/8" 3/4" KJU 23205

Shape V - Convex

Midget Mill Shape V - Convex diagram

Convex shape for deburring and finishing outside radii. Generates a radius on the inside edge of the workpiece.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 3/8" CEV 23206
5/8" 7/16" IFV 23207
3/4" 1/2" JGV 23208
1" 3/16" LBV 23209
1-1/4" 7/8" NKV 23210

Shape W - Radius End Only

Cutting flutes only on the radius end, smooth shank body. Designed for end-only cutting operations where side contact must be avoided.

Head Dia. Flute Length Tool Name HSS EDP
1/4" 1/8" CAW 23211
5/16" 1/4" DCW 23212
3/8" 1/4" ECW 23213
1/2" 3/8" GEW 23214
7/8" 1/2" KGW 23215
1" 1/2" LGW 23216

Shape X - Double Angle

Midget Mill Shape X - Double Angle diagram

Convex shape mills combining forward and reverse angles. Forward angle is given first, followed by reverse angle. Angles are given with centerline. Special angles available at nominal extra charge.

Head Dia. Head Length Angle A Angle B Tool Name HSS EDP
1/4" 3/8" 80° 10° CEX 23217
5/8" 5/8" 40° 20° IIX 23218
3/4" 1/2" 120° 60° JGX 23219
1" 3/4" 90° 30° LJX 23220
1/4" 1/4" 20° 20° CCX 23221
5/16" 1/4" 30° 30° DCX 23222
3/8" 1/4" 60° 60° ECX 23223
1/2" 1/4" 50° 50° GCX 23224
5/8" 1/4" 60° 60° ICX 23225
1" 1/4" 90° 90° LCX 23226
1-1/2" 1/4" 60° 60° PCX-30 23227
1-1/2" 1/4" 90° 90° PCX-45 23228
1-1/2" 1/4" 120° 120° PCX-60 23229

Shape BI - Bi-Convex

Midget Mill Shape BI - Bi-Convex diagram

Convex shape mills with cutting teeth on the radius only. Different from Shape X which has dual angles - Shape BI provides smooth convex cutting action for blending and finishing operations.

Head Dia. Head Length Tool Name HSS EDP
3/16" 5/16" BIRU 23230
1/4" 3/8" CJCU 23231
1/4" 5/8" CLRU 23232
1/4" 3/4" CLTU 23233
5/16" 5/8" DMRU 23234
3/8" 1/2" ELCU 23235
3/8" 3/4" ELTU 23236
1/2" 1/2" GKCU 23237

Shape FL - Flame

Midget Mill Shape FL - Flame diagram

A very handy shape for blending operations. The flame shape provides excellent access to contoured surfaces and tight radii.

Shape FL is available in Carbide only. See Midget Mills® (All Materials) for EDP numbers.

Long Shank Midget Mills

Long Shank Midget Mills for extended reach applications

Extended reach tools for deep cavity and hard-to-access deburring operations.

Long Shank Midget Mills feature special flute geometry optimized for extended reach applications. All tools have 1/4" shank diameter and 8" shank length. Other shank lengths available upon request.

Shape Head Dia. Flute Length HSS Tool HSS EDP
A - Cylindrical, Plain Nose1/4"1"CLAx823730
3/8"1"ELAx823731
1/2"1"GLAx823732
A-EC - Cylindrical, End Cutting1/4"1"CLA-ECx823733
3/8"1"ELA-ECx823734
1/2"1"GLA-ECx823735
B - Ball1/4"3/16"CCBx823736
3/8"5/16"EEBx823737
1/2"7/16"GGBx823738
C - Cylindrical, Ball Nose1/4"1"CLCx823739
3/8"1"ELCx823740
1/2"1"GLCx823741
R - Tree, Radius Nose1/4"3/4"CJRx823742
3/8"3/4"EJRx823743
1/2"1"GLRx823744
T - Tree, Pointed Nose1/4"3/4"CJTx823745
3/8"3/4"EJTx823746
1/2"1-1/8"GMTx823747
1/2"1"——
FL - Flame5/16"3/4"DJFLx823748
1/2"1-1/4"GNFLx823749
Q - Olive1/4"7/16"CFQx823750
3/8"5/8"EIQx823751
1/2"7/8"GKQx823752
H - Flame (Tapered)1/4"1/2"CGHx823753
1/2"1"GLHx823756
J - 60° Cone5/16"3/4"DJJx823754
L - Inverted Cone3/8"1"ELLx823755

Custom shank lengths available. Contact us for specific shape availability and custom configurations.

Pitch/Cut Number Reference

Midget Mills are available in various cut patterns (pitch). The standard cut is optimized for general use. Fine cuts provide smoother finishes; coarse cuts offer faster stock removal.

Cut Number Description Application
Standard Medium pitch, right-hand spiral General purpose deburring on steel, stainless, brass
Fine Closer pitch spacing Finishing work, smooth surface requirements
Coarse Wider pitch spacing Rapid stock removal, soft materials
Sever-Cut Super coarse, wide chip clearance Aluminum, zinc, copper, soft non-ferrous metals
Double Cut Cross-hatch pattern (Carbo-Mills) Aggressive cutting, all materials
Ordering Special Cuts

To order non-standard cuts, add the suffix to the tool name:

  • -F for Fine cut
  • -C for Coarse cut
  • -SC for Sever-Cut

Cut Numbers by Tool Diameter

Standard pitch will always be supplied unless otherwise specified. If an unlisted pitch is required, order by cut number.

Diameter Fine Standard Coarse Super Coarse*
3/32"235—
1/8"345—
3/16"356—
1/4"4574
5/16"467—
3/8"4686
7/16"568—
1/2"5798
9/16"579—
5/8"57910
3/4"681012
7/8"6810—
1"681016
1-1/8"6911—
1-1/4"6911—
1-1/2"7912—

*Super Coarse cuts are recommended for aluminum and other nonferrous materials for heavy, fast stock removal.

Technical Data & Speed/Feed Recommendations

The following guidelines will help you achieve optimal performance from your Midget Mills. Actual speeds and feeds may vary based on material hardness, machine rigidity, and specific application requirements.

HSS Midget Mills (M2 Steel)
Material SFM Feed/Tooth
Aluminum 300-500 .002-.004"
Brass/Bronze 200-300 .001-.003"
Mild Steel 80-120 .001-.002"
Stainless Steel 40-80 .0005-.001"
Cast Iron 60-100 .001-.002"
Carbide Midget Mills
Material SFM Feed/Tooth
Aluminum 500-1000 .002-.005"
Brass/Bronze 300-500 .001-.003"
Mild Steel 200-400 .001-.002"
Stainless Steel 100-200 .0005-.001"
Hardened Steel (40-50 HRC) 50-100 .0003-.0005"
Coolant

Use flood coolant or mist for best results. Air blast acceptable for aluminum and non-ferrous materials.

Rotation

Clockwise rotation (conventional). Use die grinders, flexible shafts, or CNC machines rated for the required RPM.

Cut Selection

Coarse cuts (8-10 pitch) for soft materials. Fine cuts (14-16 pitch) for finishing and hard materials.

Safety

Always wear safety glasses. Secure workpiece firmly. Never exceed maximum RPM for tool diameter.

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Regrind Service

Save up to 70% by resharpening your Midget Mills. We restore them to factory specs.

Regrind Service Details

Need Help Selecting the Right H.S.S. Rotary File?

Our application engineers can help you choose the optimal shape, material, and cut for your specific operation.

Contact Us 989-777-5500