Dimensions mm · values as the standard states them Size P c1 c2 d2 d3 t1 t2 t3 6 0.8
1.2
M4
4.3
6
10
1
8 1
1.6
M5
5.3
8
12
1.2
10 1.2
2
M6
6.4
10
16
1.2
12 1.6
2.5
M6
6.4
12
20
1.2
16 2
3
M8
8.4
16
25
1.5
20 2.5
3.5
M10
10.5
18
28
1.5
25 3
4
M16
17
24
35
2
30 4
5
M20
21
30
40
2
40 5
6.3
M20
21
30
40
2.5
50 6.3
8
M24
25
36
50
2.5
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 16 15.5 – 16.5
18 17.5 – 18.5
20 19.5 – 20.5
22 21.5 – 22.5
24 23.5 – 24.5
26 25.5 – 26.5
28 27.5 – 28.5
30 29.5 – 30.5
32 31.5 – 32.5
35 34.5 – 35.5
40 39.5 – 40.5
45 44.5 – 45.5
50 49.5 – 50.5
55 54.25 – 55.75
60 59.25 – 60.75
65 64.25 – 65.75
70 69.25 – 70.75
75 74.25 – 75.75
80 79.25 – 80.75
85 84.25 – 85.75
90 89.25 – 90.75
95 94.25 – 95.75
100 99.25 – 100.75
120 119.25 – 120.75
140 139.25 – 140.75
160 159.25 – 160.75
180 179.25 – 180.75
200 199.25 – 200.75
Size sheet · ISO 8733
6
c1 0.8
c2 1.2
d2 the nominal diameter of the thread M4
d3 4.3
t1 length of the thread 6
t2 the depth of the hole (is not less than) 10
t3 1 Standard lengths
16 · 18 · 20 · 22 · 24 · 26 · 28 · 30 · 32 · 35 · 40 · 45 · 50 · 55 · 60
Size sheet · ISO 8733
8
c1 1
c2 1.6
d2 the nominal diameter of the thread M5
d3 5.3
t1 length of the thread 8
t2 the depth of the hole (is not less than) 12
t3 1.2 Standard lengths
18 · 20 · 22 · 24 · 26 · 28 · 30 · 32 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80
Size sheet · ISO 8733
10
c1 1.2
c2 2
d2 the nominal diameter of the thread M6
d3 6.4
t1 length of the thread 10
t2 the depth of the hole (is not less than) 16
t3 1.2 Standard lengths
22 · 24 · 26 · 28 · 30 · 32 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100
Size sheet · ISO 8733
12
c1 1.6
c2 2.5
d2 the nominal diameter of the thread M6
d3 6.4
t1 length of the thread 12
t2 the depth of the hole (is not less than) 20
t3 1.2 Standard lengths
26 · 28 · 30 · 32 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 120
Size sheet · ISO 8733
16
c1 2
c2 3
d2 the nominal diameter of the thread M8
d3 8.4
t1 length of the thread 16
t2 the depth of the hole (is not less than) 25
t3 1.5 Standard lengths
32 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 120 · 140 · 160
Size sheet · ISO 8733
20
c1 2.5
c2 3.5
d2 the nominal diameter of the thread M10
d3 10.5
t1 length of the thread 18
t2 the depth of the hole (is not less than) 28
t3 1.5 Standard lengths
40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 120 · 140 · 160 · 180 · 200
Size sheet · ISO 8733
25
c1 3
c2 4
d2 the nominal diameter of the thread M16
d3 17
t1 length of the thread 24
t2 the depth of the hole (is not less than) 35
t3 2 Standard lengths
50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 120 · 140 · 160 · 180 · 200
Size sheet · ISO 8733
30
c1 4
c2 5
d2 the nominal diameter of the thread M20
d3 21
t1 length of the thread 30
t2 the depth of the hole (is not less than) 40
t3 2 Standard lengths
60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 120 · 140 · 160 · 180 · 200
Size sheet · ISO 8733
40
c1 5
c2 6.3
d2 the nominal diameter of the thread M20
d3 21
t1 length of the thread 30
t2 the depth of the hole (is not less than) 40
t3 2.5 Standard lengths
80 · 85 · 90 · 95 · 100 · 120 · 140 · 160 · 180 · 200
Size sheet · ISO 8733
50
c1 6.3
c2 8
d2 the nominal diameter of the thread M24
d3 25
t1 length of the thread 36
t2 the depth of the hole (is not less than) 50
t3 2.5 Standard lengths
95 · 100 · 120 · 140 · 160 · 180 · 200
Provenance
Draft — values taken from a single source and not yet cross-checked.
fasteners.eu dimensions, lengths, materials, property classes, current norm, equivalent norms Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.