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Technical Information Shank Designs - HSS
High Speed Steel Straight Shanks
DIN 1835
Form A (plain)
d 1
h6 l 1
+2
-0 d 1
h6 l 1
+2
-0
3 28 16 48
4 28 20 50
5 28 25 56
6 36 32 60
8 36 40 70
10 40 50 80
12 45 63 90
centre hole
chamfer
Form B (with drive flat)
h6 b 1
+0.05
-0 c 1
0
-1
6 4.2 18
8 5.5 10
h 1
h13 l 1
+2
-0 l 2
+1
-0
4.8 36 -
18 6.6 36 -
7 20 8.4 40 -
12 8 22.5 10.4 45 -
16 10 24 14.2 48 -
20 11 25 18.2 50 -
25 12 32 23 56 17
32 14 36 30 60 19
40 14 40 38 70 19
50 18 45 47.8 80 23
63 18 50 60.8 90 23
centre hole
chamfer
centre hole
chamfer
Form D (screwed shank)
d 1
l 1
+2
-0
l 3
+1
-0
d 2
1.27 / 20TPI
6 36 10 5.9
10 40 10 9.9
12 45 10 11.9
16 48 10 15.9
20 50 15 19.9
25 56 15 24.9
32 60 15 31.9
1.27 / 20TPI
thread undercut or
thread runout released
centering hole
thread profile
DIN ISO 228
Whitworth Form
www.klte.cz
d 1
459