Head · drive Headless · Slot
Thread Metric ISO coarse thread, full length
Tolerance up to size M1,4 - 6h, from size M1,6 - 6g
Property classes 14H 22H A1 A4
Materials Steel Stainless Brass
Dimensions mm · values as the standard states them Size P t n df dp M1 0.25 0.4 – 0.52
0.2
0.26 – 0.4
Minorthreaddiameter
0.25 – 0.5
M1.2 0.25 0.4 – 0.52
0.2
0.26 – 0.4
Minorthreaddiameter
0.35 – 0.6
M1.4 0.3 0.48 – 0.63
0.2
0.26 – 0.4
Minorthreaddiameter
0.45 – 0.7
M1.6 0.35 0.56 – 0.74
0.25
0.31 – 0.45
Minorthreaddiameter
0.55 – 0.8
M2 0.4 0.64 – 0.84
0.25
0.31 – 0.45
Minorthreaddiameter
0.75 – 1
M2.5 0.45 0.72 – 0.95
0.4
0.46 – 0.6
Minorthreaddiameter
1.25 – 1.5
M3 0.5 0.8 – 1.05
0.4
0.46 – 0.6
Minorthreaddiameter
1.75 – 2
(M3.5) 0.6 0.96 – 1.21
0.5
0.56 – 0.7
Minorthreaddiameter
1.95 – 2.2
M4 0.7 1.12 – 1.45
0.6
0.66 – 0.8
Minorthreaddiameter
2.25 – 2.5
M5 0.8 1.28 – 1.63
0.8
0.86 – 1
Minorthreaddiameter
3.2 – 3.5
M6 1 1.6 – 2
1
1.06 – 1.2
Minorthreaddiameter
3.7 – 4
M8 1.25 2 – 2.5
1.2
1.26 – 1.51
Minorthreaddiameter
5.2 – 5.5
M10 1.5 2.4 – 3
1.6
1.66 – 1.91
Minorthreaddiameter
6.67 – 7
M12 1.75 2.8 – 3.6
2
2.06 – 2.31
Minorthreaddiameter
8.14 – 8.5
Ranges read min – max; ≤ / ≥ where the standard gives one limit, ≈ for approximate values. Sizes in (brackets) are non-preferred. Select a row for its size sheet.
Length tolerances 2 1.8 – 2.2
2.5 2.3 – 2.7
3 2.8 – 3.2
4 3.75 – 4.25
5 4.75 – 5.25
6 5.7 – 6.3
8 7.7 – 8.3
10 9.7 – 10.3
12 11.6 – 12.4
14 13.6 – 14.4
16 15.6 – 16.4
20 19.6 – 20.4
25 24.6 – 25.4
30 29.6 – 30.4
35 34.5 – 35.5
40 39.5 – 40.5
45 44.5 – 45.5
50 49.5 – 50.5
55 54.4 – 55.6
60 59.4 – 60.6
Size sheet · DIN 551
M1
t 0.4 – 0.52
n 0.2
df Minorthreaddiameter
dp 0.25 – 0.5 Thread · ISO 261/262
Pitch P 0.25
d2 0.838
d3 0.693
Tap drill 0.75
Stress area As 0.46 mm² Standard lengths
2 · 2.5 · 3 · 4 · 5
Size sheet · DIN 551
M1.2
t 0.4 – 0.52
n 0.2
df Minorthreaddiameter
dp 0.35 – 0.6 Thread · ISO 261/262
Pitch P 0.25
d2 1.038
d3 0.893
Tap drill 0.95
Stress area As 0.73 mm² Standard lengths
2 · 2.5 · 3 · 4 · 5 · 6
Size sheet · DIN 551
M1.4
t 0.48 – 0.63
n 0.2
df Minorthreaddiameter
dp 0.45 – 0.7 Thread · ISO 261/262
Pitch P 0.3
d2 1.205
d3 1.032
Tap drill 1.1
Stress area As 0.98 mm² Standard lengths
2 · 2.5 · 3 · 4 · 5 · 6 · 8
Size sheet · DIN 551
M1.6
t 0.56 – 0.74
n 0.25
df Minorthreaddiameter
dp 0.55 – 0.8 Thread · ISO 261/262
Pitch P 0.35
d2 1.373
d3 1.171
Tap drill 1.25
Stress area As 1.27 mm² Standard lengths
2 · 2.5 · 3 · 4 · 5 · 6 · 8
Size sheet · DIN 551
M2
t 0.64 – 0.84
n 0.25
df Minorthreaddiameter
dp 0.75 – 1 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Standard lengths
2 · 2.5 · 3 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 551
M2.5
t 0.72 – 0.95
n 0.4
df Minorthreaddiameter
dp 1.25 – 1.5 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Standard lengths
2.5 · 3 · 4 · 5 · 6 · 8 · 10 · 12
Size sheet · DIN 551
M3
t 0.8 – 1.05
n 0.4
df Minorthreaddiameter
dp 1.75 – 2 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16
Size sheet · DIN 551
M3.5
t 0.96 – 1.21
n 0.5
df Minorthreaddiameter
dp 1.95 – 2.2 Thread · ISO 261/262
Pitch P 0.6
d2 3.11
d3 2.764
Tap drill 2.9
Stress area As 6.78 mm² Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20
Size sheet · DIN 551
M4
t 1.12 – 1.45
n 0.6
df Minorthreaddiameter
dp 2.25 – 2.5 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25
Size sheet · DIN 551
M5
t 1.28 – 1.63
n 0.8
df Minorthreaddiameter
dp 3.2 – 3.5 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30
Size sheet · DIN 551
M6
t 1.6 – 2
n 1
df Minorthreaddiameter
dp 3.7 – 4 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30
Size sheet · DIN 551
M8
t 2 – 2.5
n 1.2
df Minorthreaddiameter
dp 5.2 – 5.5 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Standard lengths
6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35
Size sheet · DIN 551
M10
t 2.4 – 3
n 1.6
df Minorthreaddiameter
dp 6.67 – 7 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 551
M12
t 2.8 – 3.6
n 2
df Minorthreaddiameter
dp 8.14 – 8.5 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Standard lengths
12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Provenance
Draft — values taken from a single source and not yet cross-checked.
Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (3) The source publishes one identical table for DIN 551, ISO 4766. Dimensionally identical to ISO 4766 per the Würth DIN→ISO changeover table ("nothing noteworthy"); the table was verified against the ISO 4766 preview. M1 n: min/max labels swapped in the source table — corrected.