Jobber drills with straight shank DIN 338

Diameter tolerances
ISO-tolerances
The standard tolerances for twist drill production to DIN 1414 corresponds with tolerance table h8 of ISO standards.
For twist drills with tighter diameter tolerances according to tolerance table h7, h6 and h5, see list of extra charges.
diameter
range mm
values mm (measured across lands, across outer corners)
h8 h7 h6 h5 m7
from 1.0 0 0 0 0
up to 3.0 –0.014 –0.010 –0.006 –0.004
above 3.0 0 0 0 0 0.016
up to 6.0 –0.018 –0.012 –0.008 –0.005 0.004
above 6.0 0 0 0 0 0.021
up to 10.0 –0.022 –0.015 –0.009 –0.006 0.006
above 10.0 0 0 0 0 0.025
up to 18.0 –0.027 –0.018 –0.011 –0.008 0.007
above 18.0 0 0 0 0 0.029
up to 30.0 –0.033 –0.021 –0.013 –0.009 0.008
above 30.0 0 0 0 0
up to 50.0 –0.039 –0.025 –0.016 –0.011
above 50.0 0 0 0 0
up to 80.0 –0.046 –0.030 –0.019 –0.013
above 80.0 0 0 0 0
up to 100.0 –0.054 –0.035 –0.022 –0.015
Microdrill tolerances to DIN 1899
The tolerances of microdrill production up to 1.5 mm diameter
complies with tolerances acc. to DIN 1899.
body diameter tolerance
= 0/– 0.004 mm
shank diameter tolerance h8 = 0/– 0.014 mm
Permissible variations for dimensions without tolerances acc. to DIN-ISO 2768
Numerical values for lengths (values in mm)
degree of
precision
nominal dimension range
over 0.5
3
to 3
6
6
30
30
120
120
315
315
1000
1000
2000
fine ±0.05 ±0.05 ±0.1 ±0.15 ±0.2 ±0.3 ±0.5
medium ±0.1 ±0.1 ±0.2 ±0.3 ±0.5 ±0.8 ±1.2
coarse ±0.15 ±0.2 ±0.5 ±0.8 ±1.2 ±2 ±3
very coarse – ±0.5 ±1 ±1.5 ±2 ±3 ±4
Numerical values for angles (values in degrees and minutes)
degree of
precision
nominal dimension range
over
10
to 10
50
50
120
120
fine, medium ±1° ±30’ ±20’ ±10’
coarse ±1°30’ ±50’ ±25’ ±15’
very coarse ±3° ±2° ±1° ±30’
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