Dimensions mm · values as the standard states them Size P t b1 b2 d2 d3 z2 M24 3 —
75
110
—
—
14
M30 3.5 —
85
120
—
—
18
M36 4 22
95
140
—
M12
22
M42 4.5 22
105
150
34
M12
25
M48 5 22
120
160
38
M12
28
M56 5.5 26
140
170
45
M16
32
M64 6 26
155
190
50
M16
36
M72 26
170
200
55
M20
40
M80 33
185
220
65
M20
45
M90 33
205
240
70
M20
50
M100 33
225
260
80
M20
56
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.
Size sheet · DIN 797
M24
b1 length of the thread (at least) 75
b2 length of the thread (at least) 110
z2 length of the ejector 14 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Size sheet · DIN 797
M30
b1 length of the thread (at least) 85
b2 length of the thread (at least) 120
z2 length of the ejector 18 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Size sheet · DIN 797
M36
t the depth of the hole (is not less than) 22
b1 length of the thread (at least) 95
b2 length of the thread (at least) 140
d3 the nominal diameter of the thread M12
z2 length of the ejector 22 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Size sheet · DIN 797
M42
t the depth of the hole (is not less than) 22
b1 length of the thread (at least) 105
b2 length of the thread (at least) 150
d2 diameter of the screw shank 34
d3 the nominal diameter of the thread M12
z2 length of the ejector 25 Thread · ISO 261/262
Pitch P 4.5
d2 39.077
d3 36.479
Tap drill 37.5
Stress area As 1120.91 mm² Size sheet · DIN 797
M48
t the depth of the hole (is not less than) 22
b1 length of the thread (at least) 120
b2 length of the thread (at least) 160
d2 diameter of the screw shank 38
d3 the nominal diameter of the thread M12
z2 length of the ejector 28 Thread · ISO 261/262
Pitch P 5
d2 44.752
d3 41.866
Tap drill 43
Stress area As 1473.15 mm² Size sheet · DIN 797
M56
t the depth of the hole (is not less than) 26
b1 length of the thread (at least) 140
b2 length of the thread (at least) 170
d2 diameter of the screw shank 45
d3 the nominal diameter of the thread M16
z2 length of the ejector 32 Thread · ISO 261/262
Pitch P 5.5
d2 52.428
d3 49.252
Tap drill 50.5
Stress area As 2030.02 mm² Size sheet · DIN 797
M64
t the depth of the hole (is not less than) 26
b1 length of the thread (at least) 155
b2 length of the thread (at least) 190
d2 diameter of the screw shank 50
d3 the nominal diameter of the thread M16
z2 length of the ejector 36 Thread · ISO 261/262
Pitch P 6
d2 60.103
d3 56.639
Tap drill 58
Stress area As 2675.97 mm² Size sheet · DIN 797
M72
t the depth of the hole (is not less than) 26
b1 length of the thread (at least) 170
b2 length of the thread (at least) 200
d2 diameter of the screw shank 55
d3 the nominal diameter of the thread M20
z2 length of the ejector 40 Size sheet · DIN 797
M80
t the depth of the hole (is not less than) 33
b1 length of the thread (at least) 185
b2 length of the thread (at least) 220
d2 diameter of the screw shank 65
d3 the nominal diameter of the thread M20
z2 length of the ejector 45 Size sheet · DIN 797
M90
t the depth of the hole (is not less than) 33
b1 length of the thread (at least) 205
b2 length of the thread (at least) 240
d2 diameter of the screw shank 70
d3 the nominal diameter of the thread M20
z2 length of the ejector 50 Size sheet · DIN 797
M100
t the depth of the hole (is not less than) 33
b1 length of the thread (at least) 225
b2 length of the thread (at least) 260
d2 diameter of the screw shank 80
d3 the nominal diameter of the thread M20
z2 length of the ejector 56 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.