Page 728 - Iscar

USER GUIDE
TAPS ISO Metric Fine Thread

Nominal Dimensions According to UNI 4535-64

Tap flank diameter production tolerances for ISO 6H
Nut threads limit dimensions - nut threads ISO 6H

1/8·H Coarse Pitch Threads
Nut thread
Dimensions in mm
1/2·H H = 0.86603P
H1 h3
60° 5
H H1 = H = 0.54127P
60° 8
1/2·H 17
Screw h3 = H = 0.61343P
1/4·H 1/6·H 24
r
3
d2 = D2 = d- H = d-0.64952P
DD2 D1 P d3 d2 d 4
d3 = d-2h3 = d-1.22687P
r = H = 0.14434P
6
Flank Dia. Tap
Nominal Pitch Flank Minor Diameter Thread Depth Radius Tolerance 6H d2 Flank Dia. Tap
Tolerance 6H
Dia. Dia. Screw Nut Screw Nut
d=D P d2=D2 r Min. Max. Min. Max.
d3 D1 h3 H1
M 20 1 19.35 18.773 18.917 0.613 0.541 0.144 19.388 19.413 19.35 19.51
M 20 1.5 19.026 18.16 18.376 0.92 0.812 0.217 19.071 19.101 19.026 19.216
M 20 2 18.701 17.546 17.835 1.227 1.083 0.289 18.752 18.786 18.701 18.913
M 22 1 21.35 20.773 20.917 0.613 0.541 0.144 21.388 21.413 21.35 21.51
M 22 1.5 21.026 20.16 20.376 0.92 0.812 0.217 21.071 21.101 21.026 21.216
M 22 2 20.701 19.546 19.835 1.227 1.083 0.289 20.752 20.786 20.701 20.913
M 24 1 23.350 22.773 22.917 0.613 0.541 0.144 23.390 23.416 23.350 23.520
M 24 1.5 23.026 22.160 22.376 0.920 0.812 0.217 23.074 23.106 23.026 23.226
M 24 2 22.701 21.546 21.835 1.227 1.083 0.289 22.754 22.791 22.701 22.925
M 25 1 24.350 23.773 23.917 0.613 0.541 0.144 24.390 24.416 24.350 24.520
M 25 1.5 24.026 23.160 23.376 0.920 0.812 0.217 24.074 24.106 24.026 24.226
M 25 2 23.701 22.546 22.835 1.227 1.083 0.289 23.754 23.791 23.701 23.925
M 26 1 25.350 24.773 24.917 0.613 0.541 0.144 25.390 25.416 25.350 25.520
M 26 1.5 25.026 24.160 24.376 0.920 0.812 0.217 25.074 25.106 25.026 25.226
M 26 2 24.701 23.546 23.835 1.227 1.083 0.289 24.754 24.791 24.701 24.925
M 27 1 26.350 25.773 25.917 0.613 0.541 0.144 26.390 26.416 26.350 26.520
M 27 1.5 26.026 25.160 25.376 0.920 0.812 0.217 26.074 26.106 26.026 26.226
M 27 2 25.701 24.546 24.835 1.227 1.083 0.289 25.754 25.791 25.701 25.925
M 28 1 27.350 26.773 26.917 0.613 0.541 0.144 27.390 27.416 27.350 27.520
M 28 1.5 27.026 26.160 26.376 0.920 0.812 0.217 27.074 27.106 27.026 27.226
M 28 2 26.701 25.546 25.835 1.227 1.083 0.289 26.754 26.791 26.701 26.925
M 30 1 29.350 28.773 28.917 0.613 0.541 0.144 29.390 29.416 29.350 29.520
M 30 1.5 29.026 28.160 28.376 0.920 0.812 0.217 29.074 29.106 29.026 29.226
M 30 2 28.701 27.546 27.835 1.227 1.083 0.289 28.754 28.791 28.701 28.925
M 30 3 28.051 26.319 26.752 1.840 1.624 0.433 28.115 28.157 28.051 28.316
M 32 1.5 31.026 30.160 30.376 0.920 0.812 0.217 31.074 31.106 31.026 31.226
M 32 2 30.701 29.546 29.835 1.227 1.083 0.289 30.754 30.791 30.701 30.925
M 33 1.5 32.026 31.160 31.376 0.920 0.812 0.217 32.074 32.106 32.026 32.226
M 33 2 31.701 30.546 30.835 1.227 1.083 0.289 31.754 31.791 31.701 31.925
M 33 3 31.051 29.319 29.752 1.840 1.624 0.433 31.115 31.157 31.051 31.316
M 35 1.5 34.026 33.160 33.376 0.920 0.812 0.217 34.074 34.106 34.026 34.226
M 35 2 33.701 32.546 32.835 1.227 1.083 0.289 33.754 33.791 33.701 33.925
M 36 1.5 35.026 34.160 34.376 0.920 0.812 0.217 35.074 35.106 35.026 35.226
M 36 2 34.701 33.546 33.835 1.227 1.083 0.289 34.754 34.791 34.701 34.925
M 36 3 34.051 32.319 32.752 1.840 1.624 0.433 34.115 34.157 34.051 34.316
M 38 1.5 37.026 36.160 36.376 0.920 0.812 0.217 37.074 37.106 37.026 37.226
M 39 1.5 38.026 37.160 37.376 0.920 0.812 0.217 38.074 38.106 38.026 38.226
M 39 2 37.701 36.546 36.835 1.227 1.083 0.289 37.754 37.791 37.701 37.925
M 39 3 37.051 35.319 35.752 1.840 1.624 0.433 37.115 37.157 37.051 37.316
M 40 1.5 39.026 38.160 38.376 0.920 0.812 0.217 39.074 39.106 39.026 39.226

ISCAR
724 ISCAR
724