Junior Mills®

Miniature 1/8" Shank Tools for Precision Work

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Precision Miniature Deburring

Junior Mills are scaled-down versions of our famous Midget Mills, designed for intricate work on small parts and in tight spaces.

With 1/8" shanks and proportionally smaller head diameters, Junior Mills provide the same precision-ground quality as standard Midget Mills but in sizes suitable for die grinders, flex shaft tools, and high-speed spindles.

Junior Mills - Miniature 1/8 inch Shank Rotary Files
Specifications
  • Shank: 1/8" (3.18mm)
  • Head Sizes: 1/8" to 3/8"
  • Materials: HSS, Carbide
  • OAL: 1-5/8"
  • Tools: JR-1 through JR-23

Junior Mills - HSS

1/8" shank diameter, 1-5/8" overall length. Available in HSS (M2 High Speed Steel). Suffix -EC denotes End Cutting.

Tool Name Head Dia. Flute Length Shape HSS EDP
JR-13/16"5/8"Cylindrical, Plain End22721
JR-1-EC3/16"5/8"Cylindrical, End Cutting22724
JR-21/4"1/2"Cylindrical, Plain End22722
JR-2-EC1/4"1/2"Cylindrical, End Cutting22725
JR-31/8"3/32"Ball22726
JR-41/4"3/16"Ball22727
JR-53/16"5/8"Cylindrical, Ball Nose22730
JR-63/16"5/8"Cone, Forward Angle22741
JR-73/16"3/8"Olive22732
JR-81/8"5/16"Tree, Rounded Nose22734
JR-93/16"3/8"Tree, Rounded Nose22735
JR-103/16"3/8"Flame22738
JR-113/8"3/64"Wheel, Plain End22745
JR-11-EC3/8"3/64"Wheel, End Cutting22746
JR-121/4"1/4"Inverted Cone, Plain End22743
JR-12-EC1/4"1/4"Inverted Cone, End Cutting22744
JR-133/16"11/64"Ball22728
JR-141/8"1/2"Cylindrical, Plain End22720
JR-14-EC1/8"1/2"Cylindrical, End Cutting22723
JR-151/4"1/2"Cylindrical, Ball Nose22731
JR-161/4"1/2"Wedge22742
JR-171/8"11/64"Ball22733
JR-181/8"13/32"Tree, Radius End22736
JR-191/8"1/2"Cylindrical22739
JR-201/4"1/2"Tree, Pointed22747
JR-211/8"1/2"Pear22737
JR-223/16"3/8"Oval22740
JR-231/8"1/4"Concave22729

Junior Mills - Carbide

Single-cut carbide versions for extended tool life on hardened steels, cast iron, and abrasive materials. Suffix -W denotes Carbide.

Tool Name Head Dia. Flute Length Shape Carbide EDP
JR-1-W3/16"5/8"Cylindrical, Plain End22821
JR-1-EC-W3/16"5/8"Cylindrical, End Cutting22824
JR-2-W1/4"1/2"Cylindrical, Plain End22822
JR-2-EC-W1/4"1/2"Cylindrical, End Cutting22825
JR-3-W1/8"3/32"Ball22826
JR-4-W1/4"3/16"Ball22828
JR-5-W3/16"5/8"Cylindrical, Ball Nose22830
JR-6-W3/16"5/8"Cone, Forward Angle22841
JR-7-W3/16"3/8"Olive22832
JR-8-W1/8"5/16"Tree, Rounded Nose22834
JR-9-W3/16"3/8"Tree, Rounded Nose22835
JR-10-W3/16"3/8"Flame22838
JR-11-W3/8"3/64"Wheel, Plain End22845
JR-11-EC-W3/8"3/64"Wheel, End Cutting22846
JR-12-W1/4"1/4"Inverted Cone, Plain End22843
JR-12-EC-W1/4"1/4"Inverted Cone, End Cutting22844
JR-13-W3/16"11/64"Ball22827
JR-14-W1/8"1/2"Cylindrical, Plain End22820
JR-14-EC-W1/8"1/2"Cylindrical, End Cutting22823
JR-15-W1/4"1/2"Cylindrical, Ball Nose22831
JR-16-W1/4"1/2"Wedge22842
JR-17-W1/8"11/64"Ball22833
JR-18-W1/8"13/32"Tree, Radius End22836
JR-19-W1/8"1/2"Cylindrical22839
JR-20-W1/4"1/2"Tree, Pointed22847
JR-21-W1/8"1/2"Pear22837
JR-22-W3/16"3/8"Oval22840
JR-23-W1/8"1/4"Concave22829

Carbide Herringbone Cut (d-burrs™)

Herringbone cut pattern close-up

Herringbone cut pattern features alternating right-hand and left-hand flutes for fine finishing on plastic, aluminum, steel, and similar materials. All tools: 1/8" shank, 1-5/8" OAL.

Tool Name Head Dia. Flute Length Shape EDP
JR-1-W-HB3/16"5/8"Cylindrical, Plain End22851
JR-2-W-HB1/4"1/2"Cylindrical, Plain End22852
JR-3-W-HB1/8"3/32"Ball22853
JR-4-W-HB1/4"3/16"Ball22855
JR-5-W-HB3/16"5/8"Cylindrical, Ball Nose22857
JR-6-W-HB3/16"5/8"Cone, Forward Angle22868
JR-7-W-HB3/16"3/8"Olive22859
JR-8-W-HB1/8"5/16"Tree, Rounded Nose22861
JR-9-W-HB3/16"3/8"Tree, Rounded Nose22862
JR-10-W-HB3/16"3/8"Flame22865
JR-11-W-HB3/8"3/64"Wheel, Plain End22871
JR-12-W-HB1/4"1/4"Inverted Cone, Plain End22870
JR-13-W-HB3/16"11/64"Ball22854
JR-14-W-HB1/8"1/2"Cylindrical, Plain End22850
JR-15-W-HB1/4"1/2"Cylindrical, Ball Nose22858
JR-16-W-HB1/4"1/2"Cone, Forward Angle22869
JR-17-W-HB1/4"1/2"Olive22860
JR-18-W-HB1/4"1/2"Tree, Rounded Nose22863
JR-19-W-HB1/4"1/2"Flame22866
JR-21-W-HB1/8"11/64"Flame22864
JR-22-W-HB1/8"13/32"Cone, Forward Angle22867
JR-23-W-HB1/8"1/2"Cylindrical, Ball Nose22856

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