Machinery's Handbook, 31st Edition
Milling Cutters
879
End Mill Terms End Mill Terms (Continued)
End Cutting Edge Concavity Angle
Radial Rake Angle (Positive Shown) Tooth Face Radial Cutting Edge
Tooth Face
End Clearance Axial Relief Angle
End Gash
Flute
Helix Angle
Enlarged Section of End Mill American National Standard Multiple- and Two-Flute Single-End Helical End Mills with Plain Straight and Weldon Shanks ANSI/ASME B94.19-1997 (R2019)
L
L
W
W
S
D
D
S
Cutter Diameter, D
Shank Diameter, S
Length of Cut, W
Length Overall, L
Nom.
Max.
Min. Min. Multiple-Flute with Plain Straight Shanks Max.
.130 .1925 .255 .380
.125 .1875 .250 .375
.125 .1875 .250 .375
.1245 .1870 .2495 .3745 .4995 .7495 .3745 .3745 .3745 .3745 .3745 .4995 .6245 .7495
1 1 ⁄ 4 1 3 ⁄ 8
1 ⁄ 8
5 ⁄ 16
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
3 ⁄ 16
1 11 ⁄ 16 1 13 ⁄ 16
1 ⁄ 4 3 ⁄ 8 1 ⁄ 2 3 ⁄ 4
.505 .755
.500 .750
.500 .750 .375 .375 .375 .375 .375 .500 .625 .750
2 1 ⁄ 4 2 5 ⁄ 8
15 ⁄ 16 1 1 ⁄ 4
Two-Flute for Keyway Cutting with Weldon Shanks
.125 .1875 .250 .3125
.1235 .1860 .2485 .3110 .3735 .4985 .6235 .7485
2 5 ⁄ 16 2 5 ⁄ 16 2 5 ⁄ 16 2 5 ⁄ 16 2 5 ⁄ 16 3 7 ⁄ 16 3 9 ⁄ 16 3 3 ⁄ 4 4 1 ⁄ 8 3 4 1 ⁄ 8
1 ⁄ 8
3 ⁄ 8
7 ⁄ 16
3 ⁄ 16
1 ⁄ 2
1 ⁄ 4
9 ⁄ 16 9 ⁄ 16
5 ⁄ 16
.375 .500 .625 .750
3 ⁄ 8 1 ⁄ 2 5 ⁄ 8 3 ⁄ 4 7 ⁄ 8
1
1 5 ⁄ 16 1 5 ⁄ 16 1 1 ⁄ 2 1 5 ⁄ 8 1 5 ⁄ 8 1 5 ⁄ 8
.875 1.000 1.250 1.500
.8735 .9985 1.2485 1.4985
.875 1.000 1.250 1.250
.8745 .9995 1.2495 1.2495
1
1 1 ⁄ 4 1 1 ⁄ 2
4 1 ⁄ 8 All dimensions are in inches. All cutters are high-speed steel. Right-hand cutters with right-hand helix are standard. The helix angle is not less than 10 degrees for multiple-flute cutters with plain straight shanks; the helix angle is optional with the manufacturer for two-flute cutters with Weldon shanks. Tolerances: On W , ± 1 ⁄ 32 inch; on L , ± 1 ⁄ 16 inch.
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